Generate Secure JWT Secret Keys
Cryptographically secure random key generation, JWT encoding and validation, hashing, password generation, and more — all running in your browser.
JWT Secret Generator
Generate cryptographically secure random keys using the Web Crypto API.
All generation happens client-side. No data is sent to any server.
Security Tools
All tools run locally in your browser.
Password Generator
Create strong, random passwords with customizable character sets and length.
Use NowUUID Generator
Generate RFC 4122 compliant UUIDs in v1, v4, and v5 formats — up to 100 at once.
Use NowAPI Key Generator
Generate secure API keys in UUID, hex, alphanumeric, or Base64 format with custom prefixes.
Use NowEncryption Key Generator
Generate AES and RSA encryption keys for symmetric and asymmetric cryptography.
Use NowSecurity Best Practices
Three pillars of JWT secret key security.
Use Strong Keys
Use at least 256-bit cryptographically random secrets. Weak or guessable keys can be brute-forced offline.
Regular Rotation
Rotate JWT secrets periodically using the kid header for zero-downtime key transitions.
Secure Storage
Store secrets in environment variables or a dedicated secrets manager. Never hardcode in source code.
Understanding JWT Secret Keys
Security essentials every developer should know.
What is a JWT secret key?
A cryptographic key used to sign and verify JSON Web Tokens, ensuring their integrity and authenticity.
How long should my JWT secret be?
Minimum 256 bits (32 bytes) for HS256. Use 512 bits for HS512 or high-security environments.
HS256 vs RS256?
HS256 uses a single shared secret. RS256 uses a private/public key pair — better for microservices and third-party verification.
Where should I store JWT secrets?
Use environment variables for simple setups. Use HashiCorp Vault or cloud KMS (AWS KMS, GCP KMS) for production.