Better-Auth Secret Generator

Better Auth Secret Generator - Free Secure Random Key Tool

Generate secure, high-entropy secrets for your Better Auth configuration. This free online tool creates cryptographically strong BETTER_AUTH_SECRET environment-variable values using the browser's built-in random number generator. All generation happens client-side in your browser, ensuring your secrets never leave your device.

What is BETTER_AUTH_SECRET?

The BETTER_AUTH_SECRET is an environment variable required by Better Auth for encryption and hashing operations. It must be at least 32 characters long and generated with high entropy to ensure security. This secret protects your authentication tokens, session data, and other sensitive operations in your application.

How do I generate a Better Auth secret?

You can generate a Better Auth secret using this free online tool. Simply select your desired length (32, 64, 128, or custom characters), click generate, and copy the resulting base64-encoded secret. The tool uses crypto.getRandomValues() for cryptographically secure random generation, meeting the security requirements for production use.

What is the recommended length for BETTER_AUTH_SECRET?

The minimum required length for BETTER_AUTH_SECRET is 32 characters, but at least 64 characters are recommended for better security. This tool defaults to 64 characters, which provides 256 bits of entropy when base64-encoded. For extra security, you can generate 128-character secrets. The custom option allows any length above 32 characters.

Why use a base64-encoded secret?

Better Auth expects the secret value to be a string, and base64 encoding is a standard way to represent random bytes as text. This tool generates random bytes and converts them to base64 format, producing a string that can be safely used as an environment variable. Base64 encoding ensures the secret contains only URL-safe characters.

Is this secret generator secure?

Yes, this secret generator is secure because it uses the Web Crypto API's crypto.getRandomValues() function, which provides cryptographically strong random values suitable for generating secrets, keys, and session identifiers. All processing happens entirely in your browser—no data is sent to any server, ensuring your generated secrets remain private.

Where do I put the BETTER_AUTH_SECRET?

After generating your secret, add it to your .env file as BETTER_AUTH_SECRET=your_generated_secret_here. Never commit this file to version control. The tool formats the output as a ready-to-use environment variable line that you can copy directly into your configuration. If you are using an alternative secrets management system, put it in there.

What are alternatives to this online generator?

Alternative methods include using OpenSSL with the command openssl rand -base64 32 or the Better Auth CLI with npx @better-auth/cli secret. However, this online generator provides a convenient, no-installation solution that runs directly in your browser and offers customizable length options.

Can I regenerate my BETTER_AUTH_SECRET later?

Yes, you can regenerate your secret at any time using this tool. However, be aware that changing the BETTER_AUTH_SECRET will invalidate all existing sessions, tokens, and encrypted data. Consider this during maintenance windows or when rotating secrets as part of your security practices.

What happens if I use a weak secret?

Using a weak or predictable secret (such as a simple password, common phrase, or short string) compromises your entire authentication system. Attackers could potentially guess or brute-force the secret to forge tokens or decrypt session data. Always use this tool or another cryptographically secure generator to create your secrets.

This tool is not part of the better-auth brand.