NanoID Generator
Generate compact, URL-friendly unique IDs
NanoID Generator is a free online tool from BrowserUtils that generate compact, url-friendly unique ids. It runs entirely in your browser — your data never leaves your device. No account required.
Alphabet:
JguAJDzTGTUo2BWF6o7Bb
Entropy: ~126 bits per ID
How to use NanoID Generator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About NanoID Generator
Free online NanoID generator. Create compact, URL-friendly unique identifiers with configurable alphabet and length. A modern alternative to UUID. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
NanoID Generator specs
- Runtime
- 100% client-side (browser)
- Built on
- Web Crypto API (SubtleCrypto) for hashing and crypto.getRandomValues for secure randomness
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What is NanoID?
NanoID is a tiny, secure, URL-friendly unique string ID generator. With its default alphabet of 64 characters and length of 21, it provides a collision probability similar to UUID v4.
How does NanoID compare to UUID?
NanoID is shorter (21 chars vs 36), URL-friendly by default, and uses a configurable alphabet. UUIDs follow a strict format and are more widely recognized.
Can I customize the NanoID alphabet and length?
Yes, you can change the alphabet (e.g., only lowercase letters, or alphanumeric only) and the ID length. Shorter IDs are more compact but have higher collision probability.
Is NanoID safe for database primary keys?
Yes, NanoID with the default 21-character length and 64-character alphabet has a collision probability comparable to UUID v4, making it safe for most database use cases.
Does the NanoID generator work offline?
Yes, IDs are generated entirely in your browser using cryptographically secure randomness. No server call is needed.
What is the collision probability of a NanoID?
With the default 21-character length and 64-character alphabet, you would need to generate about 1 billion IDs per second for 4 million years to have a 1% probability of a single collision.
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