JWT Encoder

Encode and sign JSON Web Tokens client-side

This key is never sent to any server

How it works

  • • JWT consists of Header, Payload, and Signature separated by dots
  • • Header and Payload are Base64URL encoded JSON
  • • Signature is HMAC using the algorithm you selected
  • • All encoding happens in your browser — no data is sent to any server
← Decode an existing JWT
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