NanoID is a tiny (130 bytes minified), URL-safe unique ID generator. It's shorter and more compact than UUID, using a default charset of A-Za-z0-9_- with 21 characters. At 1000 IDs/second, it takes ~149 trillion years for a 1% collision probability.

How does NanoID compare to UUID?

NanoID is more compact than UUID v4: UUID is 36 characters (with hyphens), NanoID defaults to 21 characters. NanoID uses URL-safe characters, no encoding needed. The library is only 130 bytes vs several KB for UUID. At equivalent collision probability, NanoID uses fewer characters.

Can I customize the character set?

Yes! You can use custom character sets: numbers only (0-9), letters only (A-Za-z), or custom combinations. Note: smaller character sets increase collision probability at the same length. Use at least 36 characters for security.

Why choose NanoID over UUID?

NanoID offers several advantages: 1) Shorter and more compact; 2) URL-safe without encoding; 3) Tiny library size (130B), zero dependencies; 4) Faster generation. Ideal for short links, file naming, session IDs, database keys.

Free Online NanoID Generator - Custom Length·URL-Safe·Batch Generate

📖 About NanoID

NanoID is a tiny (130 bytes), URL-safe unique ID generator. It's shorter than UUID, with over 24,000 GitHub stars and used by millions of developers.

NanoID vs UUID Comparison

Feature	NanoID	UUID v4
Length	21 chars (default)	36 chars (with hyphens)
Library Size	130 bytes	Several KB
URL Safe	✅ Yes	Needs encoding
Speed	Fast	Slower
Customizable	✅ Length + charset	❌ Fixed format

Collision Probability

NanoID uses crypto.getRandomValues() (cryptographically secure). With default config (64 chars × 21 length), at 1000 IDs/second it takes ~149 trillion years for 1% collision probability.

Use Cases

NanoID is perfect for database primary keys, short link IDs, file names, session identifiers, tracking codes, order numbers, and any scenario requiring unique identifiers. Its URL-safe nature makes it ideal for web development.

🔑 NanoID Generator

⚙️ Parameters

📦 Results

📖 About NanoID

NanoID vs UUID Comparison

Collision Probability

Use Cases