Base64 Encode / Decode
Free online Base64 encoder and decoder. Unicode-safe, supports URL-safe Base64, and runs 100% in your browser. Nothing is ever uploaded.
JWT Decoder
Paste a JSON Web Token below to see its decoded header and payload, plus a plain-English readout of the expiry (exp), issued-at (iat) and not-before (nbf) claims.
Private by default: processing stays on your device
Example payload
Input
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0IiwibmFtZSI6IkFkYSJ9.sig
Output
{
"sub": "1234",
"name": "Ada"
} These buttons share the page link, not your input.
Want to include your text?
Your current input will be stored in the link after the # symbol, not uploaded to HandyBrowserTools. Anyone with this link can read that text. If you send or post it, the service you choose also receives the link. Do not include passwords or private information.
Frequently asked questions
Is it safe to paste a real token here?
The token is decoded entirely in your browser and never transmitted. Still, treat production tokens as secrets; prefer expired or test tokens when possible.
Does this tool verify the signature?
No, it decodes and displays the token contents. Signature verification requires the signing secret or public key and should happen on your server.
Why does my token fail to decode?
A JWT must be three Base64URL segments separated by dots. Check you copied the whole token without wrapping quotes or a 'Bearer ' prefix (the tool strips 'Bearer ' automatically).
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