JWT Decoder

Decode JSON Web Tokens (JWT) safely on the client side to inspect headers and claims.

Warning: Decoding a JWT is 100% client-side and does not verify its signature or validate its authenticity. Never trust a JWT without server-side verification.

Encoded JWT

Header (Algorithm & Type)

Output will appear here...

Payload (Data/Claims)

Output will appear here...

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Supports JPG, PNG, WEBP, GIF, PDF (Max 25MB). No account needed.

Instant browser processing

100% private, files stay safe

Zero watermark & unlimited use

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Frequently Asked Questions

Is the JWT Decoder tool free to use?

Yes, the JWT Decoder tool provided by SizeSnap is 100% free to use. There are no hidden fees, premium subscriptions, or watermarks.

Are my files safe when using JWT Decoder?

Absolutely. SizeSnap prioritizes your privacy. All processing for the JWT Decoder tool happens directly in your browser. Your files are never uploaded to our servers.