Online JWT Secret Key Generator
Quickly generate a JWT secret key right in your browser. Our free online tool allows you to create a secure secret key for your application or backend server to sign and verify JSON Web Tokens (JWTs).
••••••••Reveal Full Secret Keys
Turn on the toggle above to reveal your generated JWT secret keys. This helps prevent accidental exposure while sharing your screen or working in public.
What is a JWT Secret Key?
A JWT secret key is one of the most important components of JWT authentication. It is a private, cryptographically random string used to sign and verify JSON Web Tokens (JWTs) when using symmetric algorithms such as HS256, HS384, and HS512. Secret keys are typically long, random, and non-human-readable. For optimal security, we generate 256-bit (32-byte) cryptographically secure random keys by default. Secret keys should never be exposed to clients and should be stored securely, such as in a .env file or a secrets manager.
What This Tool Does
Generate Keys of Various Sizes
Our web tool allows you to generate JWT secret keys in a variety of sizes, from shorter keys up to 1024 bits. In general, longer keys provide greater security, although a 256-bit key is already sufficient for HS256.
Cryptographically Secure Random Keys
The secret keys generated by our app are cryptographically secure and highly random, making each key unique and suitable for production use. They are generated using the Web Crypto API.
Multiple Formats
Export your secret keys in multiple formats, including Hex, Base64, and Base64URL (URL-safe Base64), to match your framework's or library's requirements. Simply choose your preferred format from the format selector.
Runs Entirely Client-Side
Your secret keys are generated entirely within your browser. Nothing leaves your device or is sent to a server, ensuring your generated keys remain private.