jwt.io has been the developer's JWT tool for a decade. It is also an Auth0 / Okta marketing surface. If you would rather decode tokens without loading their analytics, here is the alternative.
jwt.io is the de facto JWT tool and has been for 7+ years. The interface is the one every backend developer learned on, the algorithm support is wide, signature verification works out of the box, and the libraries directory is genuinely the best place to find a JWT library in any language. The JWT Handbook is free and good.
The decoding itself happens in your browser - the secret and token never get POSTed anywhere by jwt.io's own code. That has been true for years and we are not going to pretend otherwise.
jwt.io is run by Auth0, now part of Okta. The page loads Auth0 / Okta marketing tags, analytics, and a "Create a free account" CTA pointing at their identity product. The decoding is local but the surrounding page is a funnel.
PrivBatch's JWT Decoder loads zero third-party scripts, has no signup banner, and works fully offline after the first load. Same decoding, same algorithm support for the common cases (HS256, RS256, ES256), no upsell.
| Feature | jwt.io | PrivBatch |
|---|---|---|
| Brand recognition | The JWT tool everyone learned on | New (2026) |
| Libraries directory | Yes, curated across languages | No |
| JWT Handbook (free) | Yes | No |
| Algorithm coverage | Full set including ES384, PS256, EdDSA | Common set (HS256, RS256, ES256) |
| Decoding location | In-browser | In-browser |
| Free to use | Yes | Yes (Free tier) |
| Owned by an identity vendor | Auth0 / Okta | Independent |
| Third-party scripts on the page | Analytics + marketing tags | 0 |
| Signup / upsell CTA | "Create a free Auth0 account" | None |
| Prove-It network counter | No | Built-in toggle |
| Works fully offline after first load | Partial (analytics calls) | Yes |
PrivBatch Tie Competitor
You need the long-tail algorithms (ES384, EdDSA, PS256), you want to verify a signature against a JWKS, or you are reaching for the libraries directory anyway. jwt.io is still the right answer for "I need every JWT algorithm in one place."
You are pasting a production access token to inspect the claims and you would rather not load Auth0's analytics in the process. Or you want one tool family for JWTs, JSON, base64, hashing, and 17 other dev tasks with the same keyboard shortcuts.
Try the privacy-first version. 0 third-party scripts, 0 upsell.
Open JWT Decoder →