Developer Tools
NanoID Generator & Collision Calculator
Generate tiny, secure, URL-friendly unique identifiers. NanoID is more compact than UUID, faster, and safe to use in URLs without encoding.
Generated locally via Web Crypto API.
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How to Use NanoID Generator & Collision Calculator
1
Choose ID Length
Select length (default: 21 characters).
2
Select Alphabet
Use URL-safe (A-Za-z0-9_-), alphanumeric, numbers only, or custom alphabet.
3
Generate & Copy
Generate single or batch IDs and copy to clipboard.
About NanoID Generator & Collision Calculator
Uses crypto.getRandomValues() to sample uniformly from a 64-symbol URL-friendly alphabet, avoiding modulo bias through uniform mask calculation.
Supported Formats
NanoID
Operational Limits
- •Generates client-side NanoID using Web Crypto API.
Key Features
- CSPRNG cryptographic randomness
- Custom alphabet and length support
- Batch generation (1 to 500 IDs)
- Collision probability estimation display
- One-click copy and download
Frequently Asked Questions
NanoID is 21 characters long compared to UUID's 36 characters, is completely URL-safe, and uses a larger alphabet with equivalent collision resistance.
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