What is NanoID Generator?
NanoID is a tiny, secure, URL-friendly unique string ID generator — smaller than UUID (just 21 characters), ideal for frontend development. Our online NanoID generator supports custom lengths (4-64), multiple character sets (alphanumeric, hex, numeric, etc.), and custom alphabets. Uses the browser native crypto API for secure randomness. Perfect for database keys, session IDs, short links, and file identifiers.
▶Use Cases5 scenarios
- ◆Generating database unique IDs
- ◆Creating session tokens
- ◆Generating short link IDs
- ◆Frontend component keys
- ◆Test data generation
▶How to Use4 steps
- 1Choose ID length (4-64)
- 2Select alphabet or customize
- 3Set batch count
- 4Click generate and copy
▶Features6 features
- ✓Cryptographically secure
- ✓Custom alphabets
- ✓Batch generation
- ✓One-click copy
- ✓Entropy display
- ✓Runs in browser
▶FAQ5 questions
What is NanoID Generator?
An online NanoID generator. Create secure, short unique IDs with custom alphabets and lengths.. Everything runs locally in your browser — no uploads.
What is the difference between NanoID and UUID?
NanoID defaults to 21 characters; UUID is 36 (with hyphens). NanoID is shorter, URL-friendly, and supports custom alphabets — ideal for frontend and web use.
Is NanoID secure?
Yes. It uses the browser native crypto.getRandomValues() API, based on a cryptographically secure random number generator.
Can I customize the character set?
Yes. Choose from presets like alphanumeric, hex, or numeric, or enter any custom alphabet.
Will generated IDs collide?
Theoretically possible but extremely unlikely. The default 21-character length provides ~128 bits of entropy — collision probability is near zero even with a billion IDs.