Cryptography & Security

Random Token Generator

Build API keys, session secrets, or one-off passwords with full control over length and which character groups are allowed.

Free & unlimitedRuns in your browserNo sign-up required

Length

Uppercase Letters (A-Z)Lowercase Letters (a-z)Numbers (0-9)Symbols (!@#$...)

Generated Token

7GwDCBTsglcXm65Y80EJ38Wx9FwCIpDS

Random Token Generator

Every application eventually needs a random string that isn't a password: an API key, a session token, a password reset link identifier, a CSRF token, an idempotency key for a payment request, or a unique filename for an upload. The quality of that randomness matters more than most developers think about.

Cryptographically Secure Randomness

This generator creates cryptographically random strings with a custom length and character set. The word "cryptographically" is doing real work here: it means the randomness comes from a source suitable for security purposes (the Web Crypto API), not the kind of pseudo-random number generator built for simulations or games, which can sometimes be predicted if an attacker learns enough about its internal state.

Length and character set

Length and character set both affect how hard a token is to guess. A 16-character token from a large character set (letters, numbers, symbols) is dramatically harder to brute-force than an 8-character numeric-only token. For session tokens and API keys, 32 characters from an alphanumeric set is a reasonable, widely used baseline.

Common real-world uses

Generating a secret key for signing JWTs or HMACs, creating unique identifiers for database records where predictability would be a security issue, building password reset tokens that expire and can't be guessed, generating API keys, and creating test data for QA environments where you need many distinct random values quickly.

Character set restrictions

One thing to watch for: character set restrictions some systems impose. If a legacy system rejects certain symbols in tokens, generate an alphanumeric-only token here rather than fighting with escaping special characters later. Everything generates instantly and locally.

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How it works

Three steps, no setup

Set the length

Choose how many characters the token should contain.

Pick character sets

Toggle uppercase, lowercase, digits and symbols on or off.

Generate and copy

Each click produces a fresh, independently random token.

Common questions

Frequently asked questions

How random is the output?

Tokens are built using the browser's crypto.getRandomValues() API, which draws from the operating system's cryptographically secure random number generator.

What length should an API key use?

32 characters or more from a mixed character set gives a comfortable security margin for most API keys and session tokens.

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