JWT & API Tokens
Decode, sign, verify and inspect JSON Web Tokens (JWT), PASETO, API keys and CSRF tokens. All tools run strictly inside your browser thread via the W3C Web Cryptography API with zero remote telemetry.
JWT Token Decoder
Decode and inspect JSON Web Tokens (JWT) client-side. Parse header, payload claims (iss, sub, exp, iat), and signature without sending tokens to any server.
JWT Signature Verifier
Verify HMAC (HS256, HS384, HS512) or RSA/ECDSA signatures of JWT tokens client-side using Web Crypto API. Confirm payload integrity locally.
JWT Token Builder & Signer
Build and sign custom JSON Web Tokens (JWT) in your browser. Configure claims, expiration (exp), audience (aud), and sign with HS256 or RS256.
JWT Expiration & Claims Inspector
Inspect JWT expiration (exp), issued-at (iat), and not-before (nbf) timestamps with human-readable local time, countdown timers, and validity checks.
JWK to PEM Converter
Convert JSON Web Keys (JWK) into standard PKCS#8 or SPKI PEM formatted public and private keys in your browser.
PEM to JWK Converter
Convert standard PEM public or private keys into JSON Web Key (JWK) format for OAuth 2.0 and OpenID Connect JWKS endpoints.
PASETO Token Decoder
Decode and inspect PASETO (Platform-Agnostic Security Tokens) v1, v2, v3, and v4 local and public tokens without leaking claims.
Secure API Key Generator (with Custom Prefix)
Generate high-entropy API keys with custom prefixes (e.g., sk_live_..., pk_test_..., ghp_...) and CRC32 checksum verification tails in your browser.
CSRF Token Generator
Generate cryptographically random Cross-Site Request Forgery (CSRF / XSRF) anti-tamper tokens in Hex and Base64 format locally.
Bearer Token Generator
Generate OAuth 2.0 Bearer authentication tokens with high cryptographic randomness for testing API authorization headers.
Fernet Token Decoder
Decode and inspect Python cryptography Fernet symmetric tokens. Parse timestamp, initialization vector (IV), ciphertext, and HMAC.
JWT to JSON Payload Converter
Extract and format the payload of any JWT into formatted, beautified JSON with one click. Clean, minimal, and fast.
About JWT & API Tokens Architecture
Cryptographic operations in the JWT & API Tokens suite are engineered to run client-side to prevent credential leakage. Whether processing private keys, password hashes, or security tokens, our platform guarantees that no sensitive bytes leave your workstation.