NanoID is a tiny, secure, URL-friendly unique string ID generator. It uses crypto.getRandomValues() for cryptographic randomness and produces compact 21-character IDs by default.

How is NanoID different from UUID?

NanoID is shorter (21 chars vs 36), URL-friendly (no hyphens), and uses a larger alphabet making it more compact. It's also faster and smaller in bundle size.

What is the collision probability?

The collision probability depends on the ID length and alphabet size. With default settings (21 chars, 64-char alphabet), you need ~1 billion IDs for a 1% collision chance. Use the calculator to estimate for your settings.

Yes, all NanoID generation happens locally in your browser using crypto.getRandomValues(). No data is sent to any server.

NanoID Generator

Generate NanoIDs - secure, URL-friendly unique string IDs. Customizable length and alphabet with collision calculator.

