Crypto Wallets & Keys Tools

Free online crypto wallet tools — a BIP-39 mnemonic phrase generator computed entirely client-side. Nothing is ever transmitted or stored anywhere.

6 tools

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

Generate a BIP-39 mnemonic seed phrase from secure entropy, entirely in your browser. Choose 12 to 24 words and verify the checksum against the spec.

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.

Also in Crypto Wallets & Keys

Tools from other categories tagged with Crypto Wallets & Keys

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.

Why These Tools

BIP-39 Mnemonic Phrase Generator and Wei / Gwei / ETH Converter are the first two tools in a category built for the part of crypto work that has nothing to do with holding funds. The mnemonic generator builds each phrase from real entropy, appends a SHA-256 checksum exactly as the specification requires, and keeps the words blurred by default so a screenshot does not leak one. The unit converter handles the denominations every developer hits when reading contract events in Wei and paying gas in Gwei: it converts between all ten official Ethereum units using BigInt arithmetic so there is never a floating-point rounding error at the Wei level. HD derivation, address validation, and key conversion tools are next on the list.