Security Tool

Secure Token Generator

Generate cryptographically secure random tokens, API keys, secrets, and hex strings instantly — everything runs client-side, nothing is transmitted.

Token Format
Common Use Cases
🔑
API Keys
🔐
JWT Secrets
🍪
Session Tokens
🔗
CSRF Tokens
📧
Email Verify
🔄
Reset Tokens
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Tokens are generated using crypto.getRandomValues() — cryptographically secure and never transmitted.

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Understanding Secure Tokens

What Makes a Token "Cryptographically Secure"?

A cryptographically secure token is generated using a CSPRNG — a Cryptographically Secure Pseudo-Random Number Generator. Unlike regular Math.random(), which is predictable, crypto.getRandomValues() draws entropy from the operating system's hardware noise, making the output statistically impossible to predict or reproduce. This is the same source used by TLS/SSL, password managers, and hardware security modules.

Hex vs Base64 vs Base64URL

Hex encodes each byte as two characters (0–9, a–f). Safe everywhere, easy to read, but 2× the byte length. Base64 packs 3 bytes into 4 characters using A–Z, a–z, 0–9, +, /. Compact but the + and / characters need URL-encoding. Base64URL replaces those with - and _, making it safe for URLs, cookies, and JWTs without encoding. Choose the format that matches your target environment.

How Many Bytes Should a Token Be?

The right size depends on the attack surface. Session tokens and API keys should be at least 128 bits (16 bytes) to prevent brute-force guessing. For long-lived credentials like JWT signing secrets, 256 bits (32 bytes) is standard. Password reset or email verification tokens should use 256–384 bits (32–48 bytes) to make enumeration attacks impractical within their validity window. Larger is always safer; the performance cost is negligible.

API Keys vs Session Tokens vs JWTs

API keys are long-lived identifiers — treat them like passwords, store only a hashed version server-side. Session tokens are short-lived opaque strings that map to server-side session state; regenerate them on privilege changes. JWT secrets are the symmetric keys used to sign and verify JSON Web Tokens — they must be long, random, and never shared. All three benefit from a cryptographically secure generator like this one.

Frequently Asked Questions

Yes. This tool uses window.crypto.getRandomValues(), the same browser API used by professional cryptographic libraries. The generated tokens are statistically indistinguishable from those produced by OpenSSL or Node.js's crypto.randomBytes(). They are safe for use as API keys, session secrets, CSRF tokens, and signing keys in production systems.
No. All token generation happens entirely inside your browser. No network request is made, no data is logged, and no server is involved. You can confirm this by opening your browser's network tab — you'll see zero requests triggered by the Generate button. The tool works fully offline once the page has loaded.
A password is a human-memorable secret intended for repeated interactive login. A token is a machine-generated random string used for programmatic authentication or verification — API access, session management, OAuth flows, email verification, and password resets. Tokens are longer, fully random, and not meant to be memorized. Store them securely and rotate them periodically. If you need a human-memorable password instead, use our Password Generator.
For short-lived tokens (email verification, password reset), hashing with SHA-256 before database storage is best practice — it prevents an attacker who dumps the database from using the tokens directly. For long-lived API keys, store only a hashed or prefixed version and show the plaintext only once at creation. Session tokens are typically not hashed since they map to server-side session records, but they should be stored in secure, httpOnly cookies. See our Hash Generator for quick SHA hashing.
UUID v4 is a 128-bit random identifier formatted as 8-4-4-4-12 hex groups (e.g., 550e8400-e29b-41d4-a716-446655440000). It's ideal as a row identifier in databases, a resource ID in REST APIs, or any use case where you need a universally unique, human-readable identifier. For security-sensitive tokens, a raw 32-byte hex or Base64 string offers slightly more entropy density. For general IDs, UUID v4 is the standard choice. Try our dedicated UUID Generator for bulk UUID generation.
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