Code & Dev Tools

Free developer tools online — JSON formatter, Base64 encoder, UUID generator, JWT decoder, Unix timestamp converter, URL encoder, and more. 100% client-side.

5 tools
Text & ContentImage & DesignCode & DevMath & CalcSecurityCompetitive ProgrammingPDF Utilities

JSON Formatter

Paste raw JSON to instantly format, beautify, validate, and minify it.

Base64

Encode plain text to Base64 and decode Base64 strings back to human-readable text.

UUID Generator

Generate RFC 4122 compliant UUID v4 strings. Batch-generate up to 100 UUIDs at once.

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.

Frequently Asked Questions

Everything you need to know about code & dev tools

Do I need to install anything to use these dev tools?
Not at all. Every tool runs directly in your browser — no downloads, no plugins, no server dependencies.
Are the tools safe for sensitive data?
Yes. All processing happens client-side. Your code, JSON, JWTs, and other data never touch any server.
Can I bookmark or share a tool directly?
Yes! Every tool has its own unique URL. Bookmark it or share it — the tool loads instantly with no sign-up needed.