A private, browser-only inspector for technical payloads: paste something, and it recognises what it is and unwraps every layer. Live at https://decoder.in.
Built by swiss.software. Free to use.
Seventeen tools, one input box. Every page recognises every format; each page just leads with its own.
| Group | Tools |
|---|---|
| Tokens & identity | JWT decoder & verifier · JWE & JWK inspector · OAuth, OIDC & PKCE checker · SAML decoder · WebAuthn & passkey inspector |
| Certificates & keys | Certificate decoder · SSH key inspector |
| Web, mail & network | Security headers check · cURL & HTTP request parser · Email header analyzer · DNS, DoH, SPF & DMARC decoder |
| Data & encodings | Base64 · URL · JSON formatter · Unix timestamp converter · UUID & ID decoder · Protobuf decoder |