Nano ID Generator

Nano ID is a tiny, secure, URL-friendly unique string generator - a modern alternative to UUID that produces shorter IDs by default. Generate IDs at the standard 21-character length or dial in your own size and alphabet, and watch the built-in collision estimate update as you go. All generation happens locally in your browser.

• Default 21-character IDs using the standard URL-safe alphabet
• Custom size - trade shorter IDs for a lower collision margin
• Custom alphabet, including numeric-only, lowercase, or no-look-alike sets
• Live collision-probability estimate for your chosen size and alphabet
• Unbiased character selection powered by crypto.getRandomValues
• Bulk generation with one-click copy of the full list

1. 1

   Choose a size

   Start with the default 21 characters, or reduce it for shorter IDs. The tool shows how the collision risk changes as you shrink the size.

2. 2

   Set the alphabet (optional)

   Keep the default URL-safe set (A–Z, a–z, 0–9, _ and -), or supply your own - for example, digits only or a set that omits ambiguous characters like 0, O, I and l.

3. 3

   Generate in bulk

   Enter how many IDs you need and generate them instantly. Each value is unbiased across your alphabet.

4. 4

   Copy the results

   Copy one ID or the entire list, then drop them into URLs, database rows, or configuration.

• Short IDs for public URLs, share links, and slugs
• Database identifiers where a compact key is preferable to a full UUID
• Coupon, invite, and referral codes with a readable custom alphabet
• Filenames and object keys that must be URL-safe
• Client-generated keys for optimistic UI updates