JWT generator. Generate signed JWT tokens for testing with custom headers, standard claims, and HS256/HS384/HS512 signing.
100% browser-based — your data never leaves your device
Generate signed JWT tokens for testing with custom headers and payloads.
Type the JSON payload with standard claims (sub, exp, iat, iss) and any custom fields.
Enter a strong secret key used to sign the JWT with HS256, HS384, or HS512.
Customize header parameters like kid, typ, and cty in the advanced options.
Click Generate to create your signed JWT token and copy it to use in API requests.
Ctrl+Enter to generate jwt
Decode and inspect JWT tokens instantly.
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JWT Generator is a free online security tool that generate signed jwt tokens for testing with custom headers and payloads. It works entirely in your browser — no downloads, no installations, and no server uploads required. security engineers, backend developers, system administrators use JWT Generator when they need a fast, privacy-respecting way to process security data without installing additional software. It supports capabilities such as custom payload, algorithm selection, header customization. Additional features include local signing. Common use cases include generating jwt tokens for api authentication testing and development, creating signed jwts with custom claims for single sign-on (sso) systems, testing jwt token expiration and claim validation in security testing workflows. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JWT Generator ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
JWT Generator is a free online security tool that helps you generate signed jwt tokens for testing with custom headers and payloads. Key capabilities include custom payload, algorithm selection, header customization. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating jwt tokens for api authentication testing and development.
Type the JSON payload with standard claims (sub, exp, iat, iss) and any custom fields.
Enter a strong secret key used to sign the JWT with HS256, HS384, or HS512.
Customize header parameters like kid, typ, and cty in the advanced options.
Click Generate to create your signed JWT token and copy it to use in API requests.
| Category | Details |
|---|---|
| Input Limits | Maximum input size: Browser memory bound |
| Key sizes: 128–4096 bits (algorithm dependent) | |
| Supported Formats | Raw text, Hex, Base64, Binary, JWT / JWS / JWE |
| Browser Engine |
|
All operations run entirely in your browser using built-in Security APIs. No server uploads, no data storage, and no third-party requests.
JWT Generator is ideal when you need to generating jwt tokens for api authentication testing and development without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for command-line cryptographic operations, consider using OpenSSL CLI. For for enterprise secret management, HashiCorp Vault may be a better fit. JWT Generator fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. JWT Generator processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
HS256, HS384, and HS512 are supported. These are HMAC-based symmetric signing algorithms using SHA-256, SHA-384, and SHA-512 respectively.
No. All signing is done locally using the Web Crypto API. Your secret key and JWT payload never leave your browser.
Build JWT payloads with standard claims (sub, exp, iat, iss) and custom fields.
HS256, HS384, HS512 signing algorithms with custom secret keys.
Customize header parameters like kid, typ, and cty.
All signing happens in your browser using the Web Crypto API.
JWT Generator is useful in a variety of scenarios across different workflows:
Generating JWT tokens for API authentication testing and development
Creating signed JWTs with custom claims for single sign-on (SSO) systems
Testing JWT token expiration and claim validation in security testing workflows
Use at least 256-bit (32-byte) secrets for HS256. Weak secrets can be brute-forced to forge tokens.
Always include an exp (expiration) claim. Short-lived tokens (15-60 minutes) reduce the risk of token theft.
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