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Password Leak Checker online

Check if a password is breached (HaveIBeenPwned) via k-anonymity — password never leaves your device.

🌐 Internet connection required. This tool sends a request to an online service to work, so the data you enter will leave your device. Other DevBox tools still run 100% offline.

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JWT Decoder Decode the header and payload of a JSON Web Token. Warns about expiration. Does not verify the signature (offline). JWT Verify (HS256) Verify a JWT's HMAC-SHA256 signature using your secret — locally, so the secret never leaves your browser. JWT Builder (HS256) Create and sign a JWT with HMAC-SHA256 — handy for generating test tokens. Signing happens locally. Hash (SHA) Compute SHA-1/256/384/512 hashes using the Web Crypto API, entirely on your device. Base64 Encode/Decode Encode/decode Base64 with full UTF-8 support (works correctly with any language). Password / Token Generate strong passwords and secret tokens (API keys, NEWS_INGEST_TOKEN, etc.) using secure crypto — nothing leaves your browser.
🌐 Password Leak Checker online needs to call out to the Internet (a third-party service) to work — consider the data you enter. Free, no sign-up required. See446 free dev tools more.