About DevDecode

Decode. Convert. Hash. Format.

DevDecode.dev is a collection of 91 free online developer and security tools built for DevOps engineers, security professionals, sysadmins, and developers.

Why DevDecode?

When you're debugging a JWT, decoding a SAML response, or checking a certificate, you need a tool that's fast, reliable, and — critically — doesn't phone home with your sensitive data.

Every tool on DevDecode runs 100% in your browser. No server-side processing. No data logging. Your private keys, tokens, and certificates never leave your device.

How These Tools Are Built

Each tool implements the published specification it is named for — JWTs follow RFC 7519, X.509 certificate parsing follows RFC 5280, TOTP follows RFC 6238, and AES follows NIST FIPS 197.

Cryptographic operations — AES, RSA, SHA hashing, and HMAC — use the browser's native Web Crypto API rather than hand-rolled JavaScript, so results match what OpenSSL and standard libraries produce. Each tool page links the exact standards it implements so you can verify the behaviour yourself.