Email & Authentication Tools

Decode and debug JWT tokens - access tokens, ID tokens, and refresh tokens. Paste any JWT to instantly decode the header and payload, identify token type, check expiry, extract all claims (iss, sub, aud, exp, scope, client_id, etc.) with detailed explanations and security warnings - all processed locally in your browser using built-in base64 decoding. Free online OAuth2 debugger, no signup required.

Generate cryptographically secure API keys in multiple formats: hex (lowercase/uppercase), Base64 (standard/URL-safe), UUID v4, and custom character sets. Choose key bit length (128-bit to 1024-bit), add optional prefixes (sk-, pk-, api-) and visual separators, and batch generate up to 50 keys at once - all generated locally using the Web Crypto API (crypto.getRandomValues). Free online API key generator - no signup required.