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Random String Generator

Generate random strings with custom charsets and presets for API keys, tokens, and PINs.

Runs 100% in your browser — nothing is uploaded

About this tool

The Random String Generator creates cryptographically random strings from any character set you define. Built-in presets cover the most common cases: API keys (32-char hex), alphanumeric tokens, URL-safe tokens, and numeric PINs. The length slider (1–256 characters) and count selector (1–25 strings) give you full control over the output.

Unlike password managers or online services that generate tokens server-side, this tool uses crypto.getRandomValues directly in your browser — the same entropy source used by your operating system for key material. You can verify this by opening DevTools → Network while generating: zero outbound requests.

Common uses: generating API keys for local development, creating test fixtures with random tokens, producing one-time codes, seeding databases with randomised identifiers, and generating sample data for mock APIs. Multiple strings can be copied as a newline-separated batch.

Frequently asked questions

Is this tool safe for generating API keys?
Yes for development and testing purposes. For production API keys, prefer keys generated by your platform or framework which will store and manage them securely. This tool generates the bytes locally but does not store or register them anywhere.
How is this different from the Password Generator?
The Password Generator is focused on memorable, typeable passwords with an entropy strength meter. The Random String Generator focuses on arbitrary token formats with custom character sets and bulk generation. Use this for tokens, IDs, and keys; use the Password Generator for passwords.
Can I generate binary or non-printable characters?
Only printable characters can be typed into the charset field. For binary randomness, use the SHA Hash Generator on a random input, or use the browser's crypto.getRandomValues directly in the browser console.
What is the maximum string length?
Up to 256 characters per string, 25 strings at a time. For longer strings or more, the UUID, ULID, and Nano ID generators are better suited for very large batches.

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