Free online JWT tools to decode, verify, and debug JSON Web Tokens. Inspect headers, payloads, and signatures without sending data to any server.
10 tools available
JWT Decoder
Free online JWT decoder — decode JWT tokens into header, payload, and signature instantly in your browser. No data is stored. Parses base64url-encoded header and payload claims, displays the raw signature.
JWT Encoder
Free online JWT encoder — create HMAC-signed JWT tokens instantly in your browser. No data is stored. Supports HS256, HS384, and HS512 algorithms with configurable secret key.
JWT Debugger
Free online JWT debugger — analyze JWT tokens for expiry, format, and claims problems instantly in your browser. No data is stored. Detects expired tokens, missing claims, invalid algorithms, malformed headers, and structural issues.
JWT Expiry Checker
Free online JWT expiry checker — check JWT token expiration status instantly in your browser. No data is stored. Reads exp, iat, and nbf claims, shows remaining lifetime or time since expiry in human-readable format.
JWT Claims Builder
Free online JWT claims builder — assemble JWT payload objects with standard RFC 7519 claims instantly in your browser. No data is stored. Supports iss, sub, aud, exp, iat, jti claims plus custom key-value pairs.
JWT RS256 Generator
Free online JWT RS256 generator — create RS256-signed JWT tokens with auto-generated RSA key pairs instantly in your browser. No data is stored. Generates 2048-bit RSA keys, exports PEM public/private keys for verification.
PASETO Decoder
Free online PASETO decoder — decode and inspect PASETO token structure instantly in your browser. No data is stored. Parses version (v1-v4), purpose (local/public), encoded payload, and optional footer with key ID.
OAuth Token Decoder
Free online OAuth token decoder — decode and inspect OAuth access/refresh tokens instantly in your browser. No data is stored. Detects JWT vs opaque tokens, extracts scopes, client ID, audience, and expiration claims.
SAML Decoder
Free online SAML decoder — decode Base64-encoded SAML assertions and responses to readable XML instantly in your browser. No data is stored. Handles URL-encoded and base64url input, pretty-prints XML with proper indentation.
Fernet Encoder
Free online Fernet encoder — generate Fernet encrypted tokens instantly in your browser. No data is stored. Uses AES-128-CBC encryption with HMAC-SHA256 authentication, auto-generates or accepts a 32-byte symmetric key.