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YFT
Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

JWT Builder

Build JWT tokens from header and payload JSON.

FreeRuns in browserjwt builderjwt creator

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Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About JWT Builder

Build JWT tokens from header and payload JSON. Build and create JWT tokens from custom header and payload JSON online for free. Assemble JSON Web Tokens for testing APIs and authentication workflows. Implements standard encoding and decoding algorithms that produce output compatible with all major programming languages and platforms. Supports both encoding and decoding in a single interface. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: JWT Decoder, Base64 Encode / Decode, JSON Formatter & Validator

How to Use JWT Builder

  1. Enter text or data in the input field.
  2. Click Encode or Decode depending on your goal.
  3. Copy the output to your clipboard.

Frequently Asked Questions

What is JWT Builder?
Build and create JWT tokens from custom header and payload JSON online for free. Assemble JSON Web Tokens for testing APIs and authentication workflows.
What encoding standards are used?
This tool follows the official encoding specifications, including RFC standards where applicable. The implementation matches widely-used libraries so the output is compatible with other systems and programming languages.
Can I encode binary data?
The tool primarily handles text input, but many encoding formats such as Base64 are designed to represent binary data as text. You can paste Base64-encoded binary data for decoding or encode text into a binary-safe format.
Is the encoding reversible?
Yes, all encoding operations provided by this tool are fully reversible. You can encode text and then decode it back to get the exact original content without any data loss.
Is JWT Builder free to use?
Yes, encoding and decoding are completely free with no usage limits. The tool runs in your browser and requires no registration.
Is my data safe when using JWT Builder?
Yes, all encoding and decoding happens locally in your browser. No data leaves your device, so your input remains completely private.

Related Tools

JWT Decoder
Decode JWT tokens to inspect header, payload, and signature. Shows expiration status.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings. UTF-8 safe.
JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting and error detection.