340+ Free Tools — No Sign-Up Required

UtilityToolsLabFree Friendly Online Utilities for Everyday Tasks

UtilityToolsLab is a free, friendly collection of online utility tools for everyday tasks. No sign-up, no nonsense. Just tools that work.

All Tools Text & Content Image & Design Code & Dev Math & Calc Security Competitive Programming PDF Utilities Productivity Writing & Editing Encryption & Keys Auth, Privacy & Validation Crypto Wallets & Keys Smart Contracts & EVM Blockchain Encoding DeFi & Tokenomics On-Page SEO Content & Social Tools Schema & Structured Data Marketing & Ad Calculators Number & Base Tools Date & Time Tools Gaming Tools Statistics Business & Sales Unit Converters Finance & Loans ML & Data Prep Charts & Diagrams Probability & Distributions Fitness & Sports Health & Body Family, Baby & Pets Lifestyle & Budget Planners Nutrition & Diet Sleep & Wellness Advanced Math & Logic Study & Learning Chemistry Physics Biology & Genetics Building Design Power Systems Electrical Installation & Safety Electrical Basics Zoning & Site Planning Building Services Fluids & Thermal Mechanics & Motion Surveying & Land GIS & Mapping Geotechnical & Concrete Audio Tools Video & Screen Tools Device & Browser Tests Document Tools Board & Card Games Puzzle Games Arcade & Reflex Games Brain Training Table & Spreadsheet Tools Encoding & Escaping Text & Font Generators Markdown Tools Color Tools & Palettes CSS Generators Image Converters & Generators Layout & Typography Image Effects & Filters SVG & Vector Tools Data Format Converters Web Dev Helpers DevOps & Config Generators Network & IP Tools API & HTTP Tools Database & SQL Tools Hashing & Checksums Free eBooks

Text & Content

Case converters, counters, formatters and word tools

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Word Counter

Count words, characters, sentences, paragraphs, lines and reading time as you type, with live keyword density analysis. Free and private.

Case Converter

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case.

Paragraph Formatter

Clean and reformat text by removing extra spaces, collapsing blank lines, trimming each line, or joining into a single line.

Keyword Density

Measure how often each word appears in your content, as a raw count and a percentage of total words, with the top 20 terms ranked as bars.

Text Reverser

Flip a block of text four ways: by character, by word order, by line order, or word order within each line, with original spacing preserved.

Lorem Ipsum

Placeholder text in 20 languages — English, Bengali, Hindi, Arabic, Spanish, French, Chinese and more. Paragraphs, sentences, words, lists, optional emoji.

English Lorem Ipsum

Generate free English Lorem Ipsum dummy text for web design, layouts, and mockups. Classic Latin filler text in paragraphs, sentences, words, or lists.

Bangla Lorem Ipsum

Generate free Bangla (Bengali) Lorem Ipsum dummy text for web layouts and mockups. Bengali script filler in paragraphs, sentences, words, or lists.

Image & Design

Compressors, color tools, CSS generators and more

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Image Compressor

Compress JPEG, PNG, and WebP images in your browser. Control quality and max dimensions — no server upload required.

HEX ↔ RGB

Convert color codes between HEX, RGB, RGBA and HSL instantly, with a live visual preview. Built for designers and CSS work — free, no sign-up.

QR Code

Generate QR codes from any URL, text, email or phone number instantly and download them as PNG. Free, no sign-up, and runs in your browser.

Color Palette

Generate harmonious color palettes from any base color. Supports complementary, triadic, analogous, and monochromatic schemes.

Gradient Generator

Generate linear, radial, and conic CSS gradients visually. Add unlimited color stops, adjust angles, use presets, copy ready CSS.

Contrast Checker

Check WCAG 2.1 contrast ratios between foreground and background. Shows AA/AAA pass/fail for normal and large text sizes.

Image Resizer

Resize any JPEG, PNG, WebP or GIF to exact pixels or a percentage. Locks the aspect ratio, steps down smoothly, re-encodes in your tab.

Format Converter

Re-encode PNG, JPEG, WebP, GIF, AVIF and BMP pictures into any of four formats, 20 files per run, with a matte colour behind transparency.

Code & Dev

JSON, Base64, UUID, JWT, timestamps and encoders

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JSON Formatter

Paste raw JSON to instantly format, beautify, validate and minify it. Syntax errors are pinpointed by line and column. Free and fully private.

Base64

Encode text or data to Base64 and decode Base64 strings back to readable text. A fast developer utility for API payloads, tokens and data URIs.

UUID Generator

Generate RFC 4122 compliant UUID v4 strings with one click, or batch-generate up to 100 unique IDs at once. Cryptographically random and free.

JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, and signature. Detects expiry and maps all registered JWT claims.

Timestamp

Convert Unix timestamps to human-readable dates and convert dates back to Unix time. Live clock with ISO 8601, UTC, and local formats.

Regex Tester

Test regular expressions live with highlighted matches, capture groups, and a plain-English breakdown of every token. Includes replace preview and flag toggles.

Random JSON Generator

Paste a JSON template and generate mock payloads with realistic random names, emails, UUIDs, dates and prices — your structure preserved exactly.

API Load Tester

Send batches of HTTP requests to any API endpoint and watch every response time land in a live log, with min, average, p95 and success-rate stats.

Math & Calc

Percentage, BMI, tip, temperature and unit converters

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Trig Calculator

All six trig functions in degrees, radians or gradians, with exact surd values, a unit circle, and honest undefined answers where tangent blows up.

Log Calculator

Compute a logarithm in any base, or solve for the base or argument, with change-of-base shown and the same log restated in base 10, e and 2.

% Calculator

Calculate percentages, percentage increase and decrease, and what percent one number is of another. Instant answers for discounts and grades.

BMI Calculator

Calculate your Body Mass Index (BMI) in metric or imperial units and see your health category instantly. Free, private, no sign-up required.

Tip Calculator

Calculate tip amounts and split bills between any number of people. Quick tip buttons, custom percentage, and per-person breakdown.

Temperature

Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Delisle instantly. Common reference points included.

Age Calculator

Calculate your exact age in years, months, days, hours, and minutes from your date of birth. Shows total counts and next birthday countdown.

Loan Calculator

Calculate your monthly loan payment (EMI), total interest, and payoff date. Includes a full amortization schedule and an extra-payment savings breakdown.

Security

Password generators, hash tools and crypto utilities

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Password Generator

Generate cryptographically strong random passwords with custom length, symbols, numbers and uppercase options. Nothing is sent to any server.

Password Strength

Score a password against what crackers actually try — wordlists, keyboard walks, leet spelling, dates — and see how long four attacks would take.

Passphrase Generator

Generate memorable passphrases using crypto.getRandomValues. 3–10 words, 5 separator styles, capitalize & digit options. Live entropy meter.

Entropy Calculator

Calculate password entropy in bits from a real password or a length-and-character-set policy, then compare crack times across four attack speeds.

API Key Generator

Generate random API-style key strings for tests, mock UIs and seed data with a chosen prefix, encoding (hex, Base64URL, alphanumeric) and length.

PIN Generator

Generate cryptographically secure PINs in numeric, alphanumeric, or hex mode. Choose length 4–16, batch up to 20 PINs, and group digits for readability.

Secret Key Generator

Generate 128–512-bit cryptographic secret keys in hex, Base64, Base64URL, or Base58 using crypto.getRandomValues. Batch up to 20 keys at once.

Password Checker

Check a password against 10 structural weakness patterns — length, common words, keyboard walks, l33t-speak, year patterns and more. Runs locally.

Competitive Programming

Algorithms, Big-O analysis, I/O generators and code formatters for coders

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Code Formatter

Format and beautify C++, Java, and Python code with consistent indentation. 100% client-side — no code leaves your browser.

Matrix Generator

Generate grid/matrix inputs for competitive programming. Random, zeros, identity, or sequential fill. Outputs in multiple formats.

Complexity Calc

Estimate Big-O operations and runtime for any N. Interactive reference table for all complexity classes from O(1) to O(N!).

Bit Visualizer

Toggle 32/64-bit grids. Click bits to flip them live and see decimal recalculate. Shows popcountll, clzll, ctzll, and MSB instantly.

Bitwise Visualizer

Flip bits in two operands and watch AND, OR, XOR, NOT and all three shift operators resolve column by column at 8, 16 or 32-bit width.

Bit Manipulation

Step through set, clear, toggle and test at any bit index, plus popcount, leading and trailing zero counts, lowbit and the power-of-two check.

Bitmask Planner

Input set size N (≤12). Visualize all 2^N bitmasks, submask iterations, and generate ready-to-paste C++ DP skeleton.

Prime Factors

Input N to instantly view prime factorization, total divisors, Euler totient, and full sorted divisors list with prime highlighting.

PDF Utilities

100% client-side PDF tools — no uploads, no servers, full privacy

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PDF Metadata

Instantly view PDF page count, version, author, title, and more. Parsed 100% in your browser — no upload required.

Images → PDF

Convert multiple JPG/PNG images into a single PDF. Reorder pages, then print-to-PDF using your browser. 100% client-side.

PDF to Text

Extract text from any PDF in the browser — powered by PDF.js. Works with modern PDFs from Chrome, Word and Acrobat. No upload, no server.

PDF Merger

Merge multiple PDF files into one in your browser. Drag to reorder pages, skip password-protected files automatically. No upload, no server.

PDF Splitter

Split a PDF in your browser: extract a page range, break it into fixed chunks, or save every page as its own file. No upload, no server, no sign-up.

PDF Rotator

Rotate all pages or a specific range in a PDF by 90°, 180° or 270°. Runs entirely in your browser — no upload, no account, no file size cap beyond 100 MB.

PDF Watermark

Stamp text across a PDF with your own size, angle, colour and opacity. Nine anchor positions or a tiled fill, on every page or a range you pick.

PDF Page Numbers

Number the pages of a PDF as 1, Page 1 or Page 1 of 12, at any corner or centre, skipping a cover page, with mirrored numbers for double-sided print.

Productivity

Greeting generators, planners, timers and daily workflow helpers

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Time Greeting

Generate Good Morning, Afternoon, Evening or Night messages from any timezone — your device, UTC, or US Eastern, Central, Mountain and Pacific.

Pomodoro Timer

Stay focused with a Pomodoro timer: 25-minute work sessions, short and long breaks, session dots, and a sound alert — all configurable, all in your browser.

Task Prioritizer

Sort tasks into the Eisenhower Matrix: Do First, Schedule, Delegate, or Eliminate. Tasks persist in localStorage across browser restarts.

Focus Timer

Set a 1-to-240-minute countdown for deep work sessions. Adjustable in 5-minute steps, six quick presets, sound alert, and a daily sessions-completed stat.

Habit Tracker

Track daily habits on a GitHub-style 84-day grid with current and longest streaks, completion rate, and color coding. Saved locally, no account.

To-Do List

Add tasks, set High / Medium / Low priority, filter by status, and track progress with a live completion bar. Saves to your browser automatically.

Online Notepad

A distraction-free notepad that saves to your browser as you type. Keep up to 20 notes, watch the word count live, download any note as Markdown.

Standup Notes

Fill in Yesterday, Today and Blockers, then copy as plain text or Markdown. Saves to your browser and keeps a 7-entry history of past standups.

Writing & Editing

Speech synthesis, readability tests and drafting aids

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Speech to Text

Dictate into a live transcript using your microphone and browser's Web Speech API. Supports 20 languages, punctuation chips, editing, copy and download.

Text to Speech

Convert typed or pasted text into spoken audio using your browser's built-in voices, with adjustable rate, pitch, volume, and live word highlighting.

Keyword Extractor

Extract the top single words or 2- and 3-word phrases from any text, ranked by frequency and share, with adjustable stopword and length filters.

Text Similarity

Compare two documents with cosine, Jaccard and character edit-distance scores, plus the words unique to each side and every phrase they share.

Style Checker

Highlights passive voice, hedges, -ly adverbs, nominalisations, filler phrases and sentences past 25 words in your own draft, colour-coded and counted.

Text Summarizer

Truncate text by word or character limit with a custom suffix, or extract the top N sentences by word-frequency relevance — all client-side, nothing uploaded.

Typo Fixer

Fix 500+ common English misspellings in one click. Shows a diff view with each typo struck through in red and the correction highlighted in green.

Rich Text Editor

Write and format documents in your browser with headings, lists, tables and images, auto-saved locally and exported as HTML, Markdown or plain text.

Encryption & Keys

AES file encryption, key pairs and certificate tooling

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AES File Encryptor

Encrypt or decrypt any file with a passphrase using AES-256-GCM and PBKDF2 key derivation, entirely in your browser. Nothing is uploaded.

RSA Key Generator

Generate RSA key pairs (2048, 3072, 4096-bit) for encryption (OAEP) or signing (PSS) in PEM format using WebCrypto. Download or copy instantly.

ECDSA Key Generator

Generate ECDSA or ECDH key pairs on P-256, P-384, or P-521 in PEM or JWK format using WebCrypto. Private key blurred by default. Nothing uploaded.

Cert Decoder

Paste a PEM certificate and read its subject, issuer, validity dates, SANs, key algorithm and SHA-256 fingerprint. Decoded in your browser only.

CSR Generator

Generate a PKCS#10 CSR and matching private key in your browser. Supports RSA 2048/4096 and EC P-256/P-384. Nothing is uploaded or transmitted.

AES Text Encryptor

Encrypt and decrypt text strings with AES-256-GCM and PBKDF2 key derivation, entirely in your browser. Output is a portable Base64 string. Nothing uploaded.

Auth, Privacy & Validation

2FA codes, cookie inspection, sanitisers and validators

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Suspicious URL Check

Read a link before you click it: decodes punycode, spots the @ trick, mixed-script homographs and brand-in-subdomain. The link is read, never fetched.

2FA QR Builder

Build the otpauth:// URI for a TOTP or HOTP account and render it as a scannable QR code. SHA-1/256/512, 6–8 digits, 30–90s period. Nothing uploaded.

TOTP Generator

Generate time-based one-time passcodes from a Base32 secret using RFC 6238, entirely in your browser. Configure the algorithm, digit count, and refresh period.

Card Validator

Validate any card number with the Luhn algorithm. Detects Visa, Mastercard, Amex, Discover and more. Shows IIN, CVC length, and formatted display.

Email Validator

Check one address or a whole list for syntax errors, mistyped providers, disposable domains and role accounts. Nothing is uploaded or looked up.

XSS Sanitizer

Remove XSS vectors from HTML using an allowlist. Keeps 49 safe tags, blocks script/iframe/svg/form and strips all on* handlers. Shows exactly what was removed.

Storage Inspector

See all cookies, localStorage, sessionStorage and IndexedDB this site has set in your browser. Live refresh, copy as JSON, clear storage — nothing uploaded.

Crypto Wallets & Keys

Mnemonics, HD derivation, address validation — all offline

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Keystore Inspector

See which account a wallet keystore holds and how strong its scrypt or PBKDF2 work factor is. No password field, and nothing is ever decrypted.

BIP-39 Generator

Seed phrase generator for BIP-39 mnemonics: 12 to 24 words from secure entropy, with the checksum built and verified against the spec on your device.

Wei/ETH Converter

Convert between all 10 Ethereum denominations — Wei, Gwei, Szabo, Finney, ETH and more — with BigInt precision and instant copy for every result.

ETH Validator

Validate any Ethereum address, check its EIP-55 mixed-case checksum, and copy the checksummed, lowercase, or uppercase form. Runs offline.

BTC Validator

Check any Bitcoin address for a valid checksum and see its type, network and witness program. Legacy, SegWit and Taproot, all offline.

WIF Converter

Convert a raw 32-byte hex private key to Wallet Import Format (WIF) and back. Supports mainnet/testnet, compressed/uncompressed public key flag. Offline.

Wallet QR

Generate a BIP-21 / EIP-681 payment QR for any Ethereum, Bitcoin or Solana address. Auto-detects chain, optional amount and label. Download PNG.

Smart Contracts & EVM

ABI, selectors, Merkle proofs, gas and EIP-712 tooling

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Function Selector

Compute the 4-byte Ethereum function selector from a Solidity signature using Keccak-256, entirely in your browser. Paste names or types.

Gas Fee Calculator

Calculate Ethereum gas fees in ETH and USD. Supports EIP-1559 (base fee + tip) and legacy gas price. Six transaction type presets included.

ENS Namehash

Compute the ENS namehash (EIP-137) for any .eth domain, label by label, using Keccak-256 in your browser. See every recursive hashing step.

Merkle Tree Builder

Build a Keccak-256 Merkle tree from an address allowlist, read off the root, and copy an inclusion proof for any leaf. OpenZeppelin sorted pairs.

ABI Encoder

Encode a Solidity function call to calldata or decode raw calldata to typed values. Supports uint/int, bool, address, bytesN, bytes and string. No upload.

Chain ID Reference

Search 59 EVM networks by name, chain ID, or currency symbol. Copy chain IDs, RPC URLs and explorer links. Covers mainnets, L2s, testnets and deprecated chains.

ETH Tx Decoder

Decode a raw RLP-encoded Ethereum transaction (type-0, EIP-2930, EIP-1559) into nonce, gas, value, calldata, access list, and ECDSA signature. 100% client-side.

Blockchain Encoding

Keccak, RLP, Base58, Bech32 and CID utilities

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RLP Encoder

Decode a raw Ethereum RLP payload into its fields, or serialise a nested structure back into bytes. Shows every item, length prefix and nesting level.

Base58 Encoder

Encode bytes or text to Base58 and Base58Check, or decode a Base58 string back to hex with a full checksum check. Runs entirely in your browser.

Bech32 Encoder

Encode a hex payload to a Bech32 or Bech32m address, or decode one back to its parts. Handles P2WPKH, Taproot, Cosmos and any custom HRP. Runs in your browser.

Keccak-256

Compute the Keccak-256 hash of text or raw hex bytes entirely in your browser — the Ethereum variant, not NIST SHA-3. No uploads, ever.

EIP-55 Checksum

Apply or validate the EIP-55 mixed-case checksum on any Ethereum address. Shows checksummed, lowercase, and uppercase forms with instant copy.

Satoshi/BTC

Convert between Satoshi, Bit, mBTC and BTC with BigInt precision. No floating-point rounding at the satoshi level, no price feed, no network call.

IPFS CID Inspector

Decode any IPFS CID (v0 or v1) into multibase, multicodec, hash function and digest bytes. Converts between CIDv0 and CIDv1 base32 forms. Runs client-side.

DeFi & Tokenomics

Impermanent loss, staking, APY, vesting and mining maths

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Token Supply

Convert ERC-20 token amounts to the base-unit integer a contract call takes and back, and see what token supply and token decimals mean. BigInt-exact.

Vesting Planner

Turn an allocation, cliff and vesting period into a dated unlock schedule with a cumulative curve and CSV export. Handles both cliff conventions.

Impermanent Loss

Model the impermanent loss from a 50/50 liquidity pool as one token's price moves, entirely in your browser, with dollar amounts, not just percent.

APY/APR Converter

Convert APY to APR or APR to APY across 8 compounding frequencies. Shows the formula, result, and a full comparison table. Includes continuous compounding.

Staking Rewards

Project staked crypto growth over any period at a given APR, with simple or compounding payout. See total rewards, effective APY and a balance timeline.

LP Share Calc

Enter your pool reserves and deposit amount to calculate your LP share percentage and the matching token required. Supports 50/50 and weighted pools.

DCA Simulator

Simulate a Dollar-Cost Averaging strategy for crypto: enter start and end prices, periods and investment amount to see cost basis, portfolio value and P&L.

On-Page SEO

Meta tags, canonicals, hreflang, SERP preview and slugs

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Hreflang Generator

Build hreflang tags for every language version of a page as HTML, an HTTP header or sitemap XML, and catch invalid codes like en-UK before they ship.

SERP Preview

Preview how a title and description will look in Google search results, with real pixel-width truncation, not just a character count. 100% client-side.

Meta Tag Generator

Generate title, description, canonical, robots, Open Graph, and Twitter Card meta tags in one place. Copy the HTML and paste into your page head.

robots.txt Generator

Build a valid robots.txt file from Allow/Disallow rule groups, crawl-delay and sitemap URLs. Multiple user-agents supported. Copy and paste, entirely offline.

Keyword Permutations

Combine word lists into every long-tail keyword phrase, one term from each. Join character, list-order permutation and Google Ads match-type wrapping.

OG Tag Generator

Generate og:title, og:description, og:image and Twitter Card meta tags for any page. Supports article, product, website and video types. Paste into your head.

Twitter Card Tags

Generate twitter:card, twitter:title, twitter:description and twitter:image meta tags for summary, large-image, player and app cards. Live preview included.

Schema & Structured Data

JSON-LD generators for FAQ, product, event, recipe and more

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LocalBusiness JSON-LD

Build LocalBusiness JSON-LD with opening hours modelled properly: split shifts, merged day ranges and round-the-clock trading all come out correct.

Article Schema

Build Article, BlogPosting or NewsArticle JSON-LD with author, publisher and date properties. Flags a headline over Google's 110-character limit.

FAQ Schema

Build a schema.org FAQPage JSON-LD block from your own questions and answers, ready to paste into your page. 100% client-side, no uploads.

Breadcrumb Schema

Build a schema.org BreadcrumbList JSON-LD block from an ordered page trail, ready to paste into your page. 100% client-side, no uploads.

Product Schema

Build a schema.org Product JSON-LD block with brand, SKU, price, availability and star ratings. Empty fields are dropped, so the markup stays valid.

Event Schema

Build a schema.org Event JSON-LD block with dates, venue, organiser and ticket offers. Supports in-person, online and hybrid modes. Empty fields are dropped.

Recipe Schema

Build a schema.org Recipe JSON-LD block with ingredients, step-by-step instructions, cooking times, nutrition and star ratings. Empty fields are dropped.

Marketing & Ad Calculators

UTM, CTR, CPC, CPM, CPA, CLV, CAC and A/B significance

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CPA Calculator

Solve for CPA, total conversions or ad spend from the other two, set a target CPA to see the conversion gap, and compare against channel benchmarks. Offline.

CLV Calculator

Work out customer lifetime value three ways, with the LTV to CAC ratio and payback month, and see why zero churn breaks the usual formula.

A/B Significance

Run a two-proportion z-test on your A/B test results and get a real p-value, not just a percentage. Fully client-side, no data ever leaves your device.

CTR Calculator

Calculate click-through rate from clicks and impressions, set a target CTR to see the click gap, and compare against common channel benchmarks. Offline.

CPM Calculator

CPM calculator: solve for CPM, impressions or ad spend from the other two, with a target-CPM gap, cost per impression and common channel benchmarks.

CPC Calculator

Solve for CPC, total clicks or ad spend from the other two, set a target CPC to see the click gap, and compare against channel benchmarks. No login needed.

UTM Builder

Tag any link with utm_source, utm_medium and campaign parameters, or paste a finished link and read its fields back out. Existing query strings survive.

Number & Base Tools

Primes, factorials, base conversion, matrices and randomisers

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Matrix Calculator

Add, subtract, multiply, transpose, and find the determinant or inverse of a 2x2 or 3x3 matrix. No data ever leaves your device.

Random Numbers

Free random number generator (RNG) for whole numbers in any range, drawn from your device's cryptographic source, with unique mode and no modulo bias.

Dice Roller

Roll d4 through d100 with standard dice notation like 2d6+3, a running history, and cryptographically random results. No physical dice required.

Fibonacci Generator

Generate the Fibonacci sequence up to F(200) with exact BigInt precision. Shows golden-ratio convergence, a visual bar chart, and copy as CSV or lines.

Factorial Calculator

Compute n! for any n from 0 to 500 using exact BigInt arithmetic. Shows digit count, trailing zeros, Stirling approximation, and a P(n,r)/C(n,r) helper.

Prime Checker

Check whether any positive integer is prime, with the full prime factorisation when it is not. Trial division to ⌈√n⌉ — deterministic and exact.

Date & Time Tools

Differences, time zones, timers, clocks and working days

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Date Difference

Get the exact calendar difference between two dates in years, months and days, plus total days, weeks, hours and minutes.

Working Days

Count business days between two dates, excluding weekends and any public or custom holidays. Add N working days to find a deadline. 5-day or 6-day work week.

Time Zone Converter

Convert any date and time across 40 IANA time zones simultaneously. DST handled automatically. Copy any result with one click. No server, no sign-up.

Date Add / Subtract

Add or subtract years, months, weeks, days, hours and minutes from any date. Month-end clamping, ISO week number and a copyable ISO 8601 stamp.

Countdown Timer

Live countdown to any date and time in days, hours, minutes and seconds. Shows total hours and minutes too. Past dates switch to elapsed time automatically.

Time Card Calculator

Calculate worked hours and overtime from clock-in, clock-out and break data. Supports night shifts, daily and weekly OT caps, and optional gross pay.

Gaming Tools

Stylish name generators, font pickers, and symbol palettes for mobile games

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FF Name Generator

Type any nickname and get 70+ stylish Free Fire variants across 8 Unicode fonts and 9 border frames. One-click copy on every result. No sign-up.

Statistics

Mean, median, mode, standard deviation, z-score, correlation and more

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Median Calculator

Find the median of any dataset in seconds. Sorts the values, highlights the middle position(s), and shows the step-by-step calculation for odd and even counts.

Mean Calculator

Paste any dataset to instantly compute mean, median, mode, range, variance, standard deviation, quartiles, IQR and skewness. Sample and population modes.

Business & Sales

Discounts, tax, profit margin, break-even and invoicing tools

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Discount Calculator

Calculate final sale price, saving, and effective rate for single or stacked discounts. Step-by-step breakdown, currency selector, copy summary.

Profit Margin

Find profit, gross margin and markup from cost and price, or the price that hits a target margin. Rounds prices up so the margin never falls short.

Unit Converters

Length, weight, volume, temperature, speed, energy and clothing sizes

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Unit Converter

Convert length, weight, volume and temperature across metric and imperial units. Instant results, swap button, and a full reference table for every unit.

Speed Calculator

Solve for speed, distance or time by entering any two values. Pick your units and get the third — with a full cross-unit table for all three quantities.

Finance & Loans

Compound interest, mortgage, inflation, retirement and debt payoff

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Compound Interest

Calculate compound interest with 8 compounding frequencies, optional monthly contributions, and a year-by-year growth table. 100% client-side.

Mortgage Calculator

Calculate your monthly mortgage payment, total interest paid, and full amortisation schedule. Add extra payments to see months and interest saved. Download CSV.

ML & Data Prep

Normalisation, anonymisation, encoding and model-metric tools for machine learning workflows

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Data Anonymizer

Paste any CSV, toggle which columns hold PII, and choose Redact, Hash or Fake per column. Anonymised CSV downloads instantly — nothing leaves your browser.

Data Normalizer

Rescale a numeric dataset with Min-Max Scaling or Z-Score Standardisation. Value-by-value table, visual bars, Copy CSV and Download CSV.

Charts & Diagrams

Bar charts, pie charts, line graphs, heatmaps and more — export as SVG or CSV

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Bar Chart Generator

Create a bar chart from your own labels and values. Switch vertical or horizontal, pick a colour scheme, export as SVG or download CSV. All client-side.

Pie Chart Generator

Paste labels and values to draw a pie or donut chart with percentages that add up to exactly 100%. Group tiny slices, then export PNG, SVG or CSV.

Probability & Distributions

Normal distribution, binomial, Poisson, sampling and probability calculations

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Probability Calc

Calculate P(E), complement, odds ratio and log-odds from any event count and sample space. Shows fraction, decimal, and binomial trial stats instantly.

Normal Distribution

Compute z-score, CDF, PDF and tail probabilities for any normal distribution. Enter mean, standard deviation and a query value to get instant results.

Fitness & Sports

Calories burned, pace, heart rate zones, one-rep max and VO₂ max calculators

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Calories Burned

Calculate calories burned for 38 exercises using MET values. Choose activity, enter weight and duration to get an instant estimate for any workout.

1RM Calculator

Estimate your one-rep max from any set of 1 to 20 reps with seven formulas side by side, then get training loads rounded to the plates you have.

Health & Body

BMI, TDEE, body fat, water intake and blood-marker calculators

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Calorie / TDEE

Calculate your BMR and TDEE using the Mifflin-St Jeor equation. Enter age, weight, height and activity level to get daily calorie targets for any goal.

Water Intake

Find your daily water needs by weight, sex, activity and climate. Uses the 35 mL/kg rule cross-checked against EFSA baselines. Output in mL, L, fl oz or cups.

Family, Baby & Pets

Pregnancy due dates, fertility windows, baby growth and pet care calculators

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Due Date

Calculate your estimated due date using LMP, conception date, or ultrasound. Naegele's rule with cycle-length adjustment. Milestone timeline included.

Ovulation

Calculate your estimated ovulation date and 6-day fertile window from your last period date, cycle length and luteal phase. Cycle timeline included.

Lifestyle & Budget Planners

Monthly budgets, commuting and moving costs, packing lists and household planning

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Budget Planner

Split take-home pay into needs, wants and savings, see each line's share of income, and compare your plan against the 50/30/20 rule.

Commute Cost

Work out what your drive to work costs per day, month and year in fuel, parking and tolls, plus the CO₂ and hours, and compare it with a transit pass.

Nutrition & Diet

Macro splits, protein targets, meal planning and recipe scaling

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Macro Calculator

Turn a calorie target into grams of protein, fat and carbs, by body weight or a keto, zone or high-protein split, with per-meal amounts.

Protein Intake

Calculate your daily protein target in grams from body weight, goal (build, cut, maintain) and activity level, with per-meal amounts and a food portion guide.

Sleep & Wellness

Sleep cycles, bedtimes, sleep debt, chronotype, hydration and jet lag

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Sleep Calculator

Sleep cycle calculator: find the bedtime or alarm that ends on a full 90-minute cycle, allowing time to fall asleep, matched to your age's hours.

Sleep Debt

Log the hours you slept each night this week to see your sleep debt, which nights fell short, and how many nights of extra sleep it takes to pay it back.

Advanced Math & Logic

Linear systems, calculus, vectors, polynomials, truth tables and K-maps

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Equation System Solver

System of equations calculator: solve up to 12 linear equations in exact fractions, with every Gauss–Jordan step and the number of solutions.

Truth Table

Turn any Boolean expression into a full truth table with step columns, minterms and canonical SOP/POS, and check whether two expressions are equivalent.

Study & Learning

GPA and grades, flashcards, spaced repetition, quizzes and citations

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GPA Calculator

Work out term, weighted and cumulative GPA from letter grades or percentages and credit hours, with Honors and AP boosts and Pass rows left out.

Citation Generator

Build APA 7, MLA 9 and Chicago citations for books, journal articles, websites and newspapers — with the matching in-text citation or footnote, ready to copy.

Chemistry

Molar mass, periodic table, equation balancing, molarity, pH and gas laws

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Molar Mass Calculator

Type a chemical formula such as Ca(OH)2 or CuSO4·5H2O to get its molar mass in g/mol, each element's mass percent, and grams-to-moles conversions.

Equation Balancer

Balance any chemical equation in one step, including ionic and redox equations, with an atom-by-atom check and a mass check. Exact maths, no guessing.

Physics

Half-life and decay, optics, waves, orbits, relativity and photon energy

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Half-Life Calculator

Solve radioactive decay for the amount left, starting amount, half-life or time elapsed, with carbon-14 and other isotope presets and a decay curve.

Wavelength ↔ Frequency

Convert wavelength, frequency and period for light, radio and sound, with photon energy, wave speed in any medium, the spectrum band and the nearest note.

Biology & Genetics

Punnett squares, genetic crosses, DNA transcription, codons and GC content

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Punnett Square

Enter two parent genotypes such as AaBb to draw the Punnett square for up to four genes, with genotype and phenotype ratios as fractions and percentages.

DNA Transcription

Paste a DNA template strand to get the mRNA transcript, codon-by-codon table, amino acid chain and GC content — runs fully in your browser.

Building Design

Staircases, floor areas, roofing, materials, daylight and structural sizing

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Stair Calculator

Lay out a flight of stairs from the floor-to-floor height: riser count and height, treads, total run and pitch, checked against IRC, IBC or UK Part K.

Paint Calculator

Work out how much paint a room needs from its size, doors, windows and coats, in litres or gallons, with primer and the exact mix of tins to buy.

Power Systems

Three-phase power, transformers, cables, motors, load flow and grid calculations

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3-Phase Power

Convert three-phase kW, kVA or motor hp to line current, or amps back to power, with power factor, kVAR and star or delta phase voltage and current.

Battery Bank Sizing

Size an inverter, IPS or solar battery bank for your load and backup hours, or find how long a bank lasts, with series-parallel wiring for lead-acid or lithium.

Electrical Installation & Safety

Motor torque, cable trays, arc flash, clearances, relays and protection

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Motor Torque

Find a motor's rated torque from kW or hp and rpm, or solve for power or speed, in N·m, lb·ft, lb·in and kgf·m, with gearbox output and pole speeds.

Generator Sizing

List the appliances you need in a power cut to find the generator size in watts and kVA, from running loads plus the biggest motor start-up surge.

Electrical Basics

Resistor codes, Ohm's law, capacitors, LEDs, wire sizing and power

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Resistor Color Code

Pick 4, 5 or 6 band colours to read a resistor's value, tolerance and range, or type 4.7k or 4k7 to get its bands, with E12, E24 and E96 checks.

Ohm's Law Calculator

Enter any two of voltage, current, resistance and power to get the other two, with the formulas used, the nearest E24 resistor and its wattage rating.

Zoning & Site Planning

Floor area ratio, lot coverage, setbacks, density, excavation and compliance

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FAR Calculator

List each floor to get gross floor area and floor area ratio for a lot, compare it with the zoning FAR limit, and see how much floor space is still allowed.

Pipe Slope Calculator

Work out the fall, slope or run length of a drain pipe, see the slope as %, 1:N, in/ft or mm/m, and check it against the IPC minimum for its size.

Building Services

Water tanks, plumbing, HVAC ducts, acoustics, fire safety and ventilation

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Water Tank Capacity

Measure a rectangular, upright or horizontal tank to get its capacity and current contents in litres, US and UK gallons, plus the time to fill it.

Wheelchair Ramp

Enter the rise to get a wheelchair ramp's length, runs, landings and handrail needs at 1:12 or gentler, checked against the 2010 ADA Standards.

Fluids & Thermal

Flow, pressure, pumps, heat transfer and machining speeds

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Flow Rate Calculator

Get flow rate from a timed fill or from pipe bore and velocity, in L/min, GPM, m³/h and CFM, with the velocity and mass flow in the line.

Ideal Gas Law

Solve PV = nRT for pressure, volume, moles or temperature in any units, enter grams of a named gas, and see the molar volume and density too.

Mechanics & Motion

Projectiles, force, torque, stress, beams, gears and springs

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Projectile Motion

Work out a projectile's range, peak height and time in the air from its launch speed, angle and start height, with the arc drawn to scale.

Gear Ratio Calculator

Find the gear ratio of one or more gear, chain or belt stages, with the output speed, the torque after losses and which way the output shaft turns.

Surveying & Land

Parcel area, bearings, traverse, levelling, slope and earthwork

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Land Area

Get a plot's area from its corner coordinates or a bearing-and-distance traverse, in square metres, acres, hectares, katha and bigha.

GIS & Mapping

Coordinates, geodesy, map scale, contours, parcels and projections

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Geodetic Distance

Measure the distance and bearing between two latitude and longitude points, by Vincenty on the WGS-84 ellipsoid and by great circle.

Geotechnical & Concrete

Mix ratios, rebar, footings, soil bearing, excavation and drainage

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Concrete Mix Ratio

Find the cement, sand, aggregate and water a pour needs from its grade and size, in bags, cubic metres, cubic feet and kilograms.

Audio Tools

Metronome, tuning, waveforms, trimming, noise and recording

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Metronome

Keep time with a steady click from 20 to 300 BPM, with tap tempo, subdivisions, odd time signatures and an accented downbeat.

Video & Screen Tools

Screen recording, video cutting, GIFs, subtitles and annotation

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Screen Recorder

Record your screen, a window or a browser tab with system sound and microphone narration, then save it as MP4 or WebM. No install, no watermark.

Device & Browser Tests

Microphone, camera, speakers, connection and browser checks

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Mic Test

Check that your microphone works with a live level meter in dBFS, waveform, noise floor and clipping alerts, then record a short clip to hear yourself.

Document Tools

DOCX text extraction, PDF page numbers, forms, signatures and redaction

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DOCX to Text

Pull the text out of a Word .docx or OpenDocument .odt file as plain text or Markdown, keeping headings, lists and tables, with headers and footnotes optional.

Board & Card Games

Tic-tac-toe, connect four, checkers, reversi, solitaire and dice

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Tic-Tac-Toe

Play noughts and crosses against an easy, medium or unbeatable computer, or a friend on the same screen, with a running score and win/draw/loss move hints.

Puzzle Games

Sudoku, minesweeper, sliding puzzles, tower of hanoi, and word games

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Sudoku

Play a uniqueness-verified Sudoku puzzle in your browser. Four difficulty levels, pencil-mark notes, naked-single hints, and an error counter. No sign-up.

Arcade & Reflex Games

Snake, block stacking, brick breaker, pong and quick reflex games

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Snake

Play classic Snake in your browser: steer with arrow keys, WASD or swipes, choose walls or wrap-around, three speeds, and beat your saved best score.

Brain Training

Reaction time, memory match, aim trainer, typing speed and reflex games

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Reaction Time Test

Measure your reaction time in milliseconds across 5 rounds. Click when the screen turns green. Get median, best, and a rating. No sign-up needed.

Table & Spreadsheet Tools

CSV to table, text to markdown table, pivot builder, dedup and joins

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Text to Table

Convert CSV, TSV or any delimited text to a Markdown, HTML or TSV table. Auto-detects delimiter, supports quoted fields and per-column alignment.

Encoding & Escaping

String escape/unescape, Unicode code points, HTML entities, Base32 and hex dumps

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String Escape

Escape and unescape strings for HTML, JavaScript and URL contexts. Converts & < > quotes and backslash sequences in both directions. All client-side.

Text & Font Generators

Pig Latin, Zalgo text, fancy Unicode fonts, upside-down text and novelty converters

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Pig Latin

Translate any English text to Pig Latin instantly. Handles consonant clusters, vowel-initial words, capitalisation and punctuation — all client-side.

Markdown Tools

Markdown previewer, HTML converter, cheatsheet and README generators

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Markdown Previewer

Write Markdown and see the formatted result live. Split, editor-only and preview-only layouts. Supports GFM tables, fenced code, blockquotes and links.

Color Tools & Palettes

Color mixers, shades generators, harmony finders, accessibility checkers and palette extractors

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Color Mixer

Blend two hex colors across 7 linear-RGB midpoints. See hex, RGB and HSL for each stop, copy individual swatches or export all as CSS custom properties.

CSS Generators

Box shadows, border radius, filters, animations, clip-paths and Glassmorphism generators

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Box Shadow Generator

Build multi-layer CSS box shadows visually with live preview. Control offset, blur, spread, color and opacity per layer, toggle inset, and copy ready CSS.

Image Converters & Generators

Image to Base64, Base64 to image, SVG to PNG, favicon generators, placeholder image creators, barcode generators and more

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Image to Base64

Convert any JPEG, PNG, WebP, GIF or SVG to a Base64 data URL, raw string or CSS background-image declaration. Runs entirely in your browser — nothing uploaded.

Layout & Typography

Type scales, grid systems, spacing calculators and CSS unit converters for design systems

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Type Scale Generator

Build a modular type scale from Major Third, Perfect Fourth, Golden Ratio and more. Export CSS variables, Tailwind fontSize config or SCSS variables instantly.

Image Effects & Filters

Duotone, noise, pixelation, blur redaction and texture effects for images

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Duotone Generator

Apply a two-colour duotone effect to any photo. Pick shadow and highlight colours, adjust intensity and blend mode, then download a PNG. 100% client-side.

SVG & Vector Tools

SVG optimisation, path building, icon generation and vector shapes

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SVG Optimizer

Shrink SVG files by stripping editor metadata, rounding path data, shortening colours and dropping unused IDs, with a pixel check that the render is unchanged.

Data Format Converters

JSON to CSV, YAML, TOML and Excel, plus type and schema generators

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JSON to CSV

Convert JSON arrays, API responses or JSON Lines to CSV. Nested objects flatten to dot columns, arrays join or split, and quoting stays Excel-safe.

Web Dev Helpers

Cron, URL, regex, chmod, semver and other everyday developer helpers

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Cron Explainer

Read any cron schedule in plain English and see its next 10 run times, or build one from presets and field inputs. Macros, names and steps supported.

DevOps & Config Generators

Docker Compose, Dockerfile, GitHub Actions, Nginx, .gitignore and CI config builders

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Compose Generator

Build a docker-compose.yml from forms: add services, map ports, set env vars, mount volumes and wire dependencies. Downloads as a ready-to-run YAML file.

Network & IP Tools

IP validation, subnet calculation, CIDR, DNS records and bandwidth tools

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IP Address Validator

Validate any IPv4 or IPv6 address and see its class, scope, binary, hex and 32-bit forms. Detects private, loopback, multicast and documentation ranges.

API & HTTP Tools

cURL commands, webhooks, HTTP headers, OpenAPI and GraphQL utilities

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cURL Builder

Build a cURL command from a form: pick a method, add headers, set Bearer / Basic / API-key auth, attach a body, toggle flags, and copy the shell-ready command.

Database & SQL Tools

SQL formatting, query building and JOIN visualisation

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SQL Formatter

Format and beautify SQL queries — uppercase keywords, indent subqueries, break lines before major clauses. Handles SELECT, INSERT, UPDATE and CREATE TABLE.

Hashing & Checksums

SHA-256, SHA-512, MD5, BLAKE2, HMAC, bcrypt and file verification tools

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SHA-256 Generator

Generate SHA-256 hashes from text or raw hex bytes, with hex, Base64 and Base64URL output. Updates live as you type. All client-side via Web Crypto API.

Free eBooks

Downloadable PDF guides and study books, free and without signup

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500 Verbs (Bangla)

Free 108-page PDF: 500 everyday English verbs with Bangla pronunciation, meaning and an example sentence each. No email, no signup.

Why these tools exist

Most of these tools started as a scratch file. Preparing for programming contests, we kept rewriting the same throwaway snippets: a submask enumerator here, a matrix generator there. Working on backend code, we kept pasting API responses into whichever JSON formatter came up first in the search results. That second habit is the one that started to bother us. A JWT is a credential. A request body is often somebody else's customer data, and neither belongs in a text box on a server nobody here knows anything about.

So we rebuilt the ones we needed and kept them local. UtilityToolsLab is where they ended up: 348 tools, each one running inside the page you already have open. Your input is handled by JavaScript in your own tab and nothing is posted anywhere, which is a claim you can check rather than trust. Open the network panel, paste a payload into the JSON formatter, and watch for a request that never fires.

That single constraint decides what is here and what is missing. A whois lookup or a link shortener genuinely needs a server, so neither one exists here and neither one will. What is here instead is the long tail we reach for on an ordinary working day: Base64 and URL encoding, timestamp conversion, WCAG contrast ratios, EMI schedules, convex hulls, segment tree scaffolding. If a tool behaves oddly, or you need one that is not on this list, the Facebook page linked in the footer is the fastest way to reach us.

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