JWT
DECODER
Decode and inspect JSON Web Token (JWT) headers, payloads, and claims directly in your browser.
HOW IT WORKS
PASTE TOKEN
Paste your compact JSON Web Token into the input textarea.
SPLIT & DECODE
The tool normalizes Base64URL encoding and parses Header and Payload JSON.
INSPECT CLAIMS
Inspect claims, expiration dates, formatted JSON, and copy decoded data.
FEATURE HIGHLIGHTS
100% PRIVATE & OFFLINE
Decoding happens entirely in browser memory. Tokens are never transmitted to external APIs or logged anywhere.
AUTOMATIC EXPIRATION CHECK
Detects standard `exp`, `iat`, and `nbf` claims to report token timing constraints instantly.
HEADER AND PAYLOAD
Inspect the decoded JSON header and payload in separate output panels.
COPY TOKEN PARTS
Copy the decoded header, payload, or signature text separately. Decoding does not verify the signature.
CLIENT-SIDE PRIVACY
ManyTinyTools operates browser-first. Your security tokens, authorization headers, and decoded payload data are processed locally and never stored, logged, or sent over any network.
TOKEN
MEMORY
JSON