NanoID Generator
Generate URL-safe NanoIDs with a custom length and alphabet. Cryptographically secure, bulk generation.
IDs are generated with the Web Crypto API (crypto.getRandomValues) — cryptographically secure, never sent anywhere.
About NanoID Generator
Generate NanoIDs — compact, URL-safe, collision-resistant unique IDs — with a configurable length and alphabet. Bulk-generate up to 1,000 at once. NanoID is a popular smaller alternative to UUID. IDs are generated with the Web Crypto API and never leave your browser.
All processing happens entirely in your browser using modern web APIs. Nothing is uploaded to our servers — your data stays local and private. Free to use forever.
Common use cases
- Generating short, URL-safe IDs for database records or short links
- Creating unique keys that are smaller than a UUID
- Producing test fixtures with realistic IDs
- Generating IDs with a custom alphabet (e.g. only lowercase)
- Creating public-facing identifiers that look clean in URLs
How it works
Random bytes are drawn from crypto.getRandomValues() and mapped to the chosen alphabet using bitmask + rejection sampling, which guarantees a uniform (unbiased) distribution across the alphabet. The default 21-character ID over a 64-symbol alphabet has a collision probability comparable to UUID v4 for practical workloads.