JWT Decoder vs JWT.io (Auth0)
JWT.io, run by Auth0, is the best-known JWT debugger and — importantly — it decodes tokens entirely in your browser. Gera Tools' decoder does the same. The difference is not security here; it is that JWT.io is the front door to Auth0's identity platform, while Gera Tools' decoder is a standalone, no-account utility.
JWT.io is excellent and, like us, decodes in your browser — if you need signature verification or JWKS for an Auth0 tenant, use it. If you just want to read a token's claims quickly without a vendor's developer portal, Gera Tools' decoder is a clean, no-account alternative.
Side-by-side comparison
| Feature | JWT Decoder Gera Tools | JWT.io (Auth0) jwt.io |
|---|---|---|
| Price | ✓ Free | ✓ Free |
| Decoding location | ✓ 100% in your browser (the island decodes the Base64url header/payload with atob — zero network calls) | ✓ Also decodes entirely in the browser |
| Account / product upsell | ✓ None — it is just a decoder | — Front door to the Auth0 identity platform |
| Signature verification | ≈ Decodes header + payload (does not verify signature) | ✓ Can verify the signature if you paste a secret/public key, incl. auto JWKS download for Auth0 tenants |
| Standalone, no redirect | ✓ Single-purpose page, no vendor flows | ✓ Embedded in Auth0's developer site |
Comparison based on each tool's publicly stated, free-tier behaviour at the time of writing. JWT.io (Auth0) is a trademark of its respective owner; we link to it for fairness and do not claim affiliation. Where JWT.io (Auth0) is genuinely stronger, the table says so.
FAQ
Is jwt.io safe to paste a token into?
For decoding, yes — jwt.io decodes in your browser and does not send the token to a server. The same is true of Gera Tools' decoder. As a general rule, never paste a live production token containing real secrets into any online tool you don't control.
Does Gera Tools verify the JWT signature?
No — it decodes the header and payload so you can read the claims. For signature verification (e.g. against a key or JWKS), use jwt.io or a server-side library.
Why use Gera Tools instead of jwt.io?
If you just want to read a token's claims without entering Auth0's developer portal, Gera Tools' decoder is a standalone page with no account and no upsell.