Nano ID Generator – Generate Nano Online (Free Tool)
Free online Nano ID Generator tool to generate Nano IDs - URL-friendly unique identifiers. Create short, secure, and unique strings. All generation happens locally using crypto API.
Example Output
Five 21-character Nano IDs — URL-safe, collision-resistant, and shorter than UUIDs for the same uniqueness guarantee.
V1StGXR8_Z5jdHi6B-myT U9XmcF7-bGq3KhrPj2W_a ...
What is Nano ID Generator?
Generate Nano IDs — modern, URL-safe, collision-resistant unique identifiers shorter than UUIDs. A 21-character Nano ID has the same collision odds as a UUID v4 but is 40% shorter and URL-friendly (no `-` separators, no special characters). Drop-in replacement for UUIDs in modern apps.
Why use this tool?
- Lightweight page weight that loads quickly even on slow connections
- Works on desktop, tablet, and mobile in any modern browser
- Stable behavior across visits — no surprise version drift
- Designed for everyday quick tasks — open the page, get the answer, move on
- No upsell to a paid plan: every feature is free forever
How to use
- Set length (default 21 — same as nanoid lib)
- Optional: customise alphabet (URL-safe by default)
- Set count for bulk generation
- Copy individual or download list
Examples
Short URL IDs
Replace `/posts/550e8400-e29b-41d4-a716-446655440000` with `/posts/V1StGXR8_Z5jdHi6B-myT` — same uniqueness, half the length.
React component keys
Generate a list of Nano IDs to use as keys in React lists where you have no natural unique field.
Custom alphabet
For only-digits IDs, pass `0123456789` as alphabet — useful for friendly numeric IDs.
Common use cases
- Short URL slugs / short links
- Database primary keys (alternative to UUID)
- React / Vue list keys
- Document IDs in MongoDB / Firestore
- Anywhere a short, opaque ID is preferable to UUID
Troubleshooting
- Two Nano IDs collided in production
- Vanishingly unlikely at length 21 (similar to UUID v4). If real, you probably shortened to 8-10 chars — bump back to 21 or use the official collision-probability calculator.
- Custom alphabet output isn't uniformly random
- Nano ID uses modular bias avoidance under the hood — output is uniformly distributed. Run a frequency test if you suspect otherwise.
- Some characters in the URL look strange
- Default alphabet includes `_` and `-`. Pass a stricter alphabet (alphanumeric only) if your URL system rejects those.
Frequently Asked Questions
Nano ID is a small, secure, URL-friendly unique string ID generator. It is 60% smaller than UUID while maintaining similar uniqueness guarantees.
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