Developer Tools

Decode JWT headers, payloads, and signatures locally.

Create customized JWTs and securely sign tokens directly in your browser.

Inspect JWT metadata, claims, expiration, and clock skew.

Verify supported JWT signatures locally.

Format JSON payloads and token data.

Create unsigned mock tokens for local testing.

Generate an RSA public and private key pair locally.

Generate public and private JSON Web Keys.

Convert JSON Web Keys into PEM format.

Convert PEM keys into JSON Web Key format.

Create a ready-to-host JWKS document.

Generate an RSA certificate signing request.

Wrap Base64 DER certificate data as PEM.

Inspect PEM certificates and fingerprints.

Decode unpadded Base64URL text.

Encode text as web-safe Base64URL.

Decode standard Base64 text.

Encode text as standard Base64.

Encode URL components with UTF-8 percent encoding.

Decode URL percent-encoded text.

Encode text safely for HTML.

Decode HTML entities into plain text.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.

Generate keyed HMAC hashes.

Generate UUID v1, v4, and v7 values.

Convert Unix timestamps and readable dates.

Format and minify JSON locally.

Generate OAuth PKCE verifiers and S256 challenges.

Test OAuth 2.0 Authorization Code flow with PKCE.