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JWT & Base64 Decoder & Inspector

Air-gapped client-side JWT token debugger and Base64 encoder/decoder. Visualizes 3-part token structures (header, payload, signature), verifies expiry timestamps (exp, iat, nbf), flags security risks (such as alg=none), and safely encodes/decodes Base64 text.

✓ Visual 3-color JWT token decomposition (header, payload, signature)✓ Automatic UTC & relative expiration timestamp calculation✓ Security warning alerts for alg=none and expired tokens✓ Bi-directional Base64 and Base64URL text encoding & decoding✓ Air-gapped privacy guarantee — zero token transmission over network
Free In-Browser Utility · 100% Client-Side & Zero Data Telemetry
Unlock All 39+ Cyber Tools & Terminal OS (₹500)
100% In-Browser Decoding · Zero Telemetry
Load Sample Token:
Encoded JWT Token325 chars
3-Part Visual Segmentation:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c3JfMTIzNDU2Nzg5MCIsIm5hbWUiOiJBbGV4IENoZW4iLCJlbWFpbCI6ImFsZXhAaGFja2VycmVjb24uY29tIiwicm9sZXMiOlsic2VjdXJpdHlfb3BlcmF0b3IiLCJhZG1pbiJdLCJpYXQiOjE3Mzg0MDAwMDAsImV4cCI6MTgwMTQ3MjAwMCwiaXNzIjoiaHR0cHM6Ly9hdXRoLmhhY2tlcnJlY29uLmNvbSJ9.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk
Header Payload Signature
HEADER: Algorithm & Token Type
// Header will appear here
PAYLOAD: Data Claims
// Payload claims will appear here
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