Nano ID Generator
Generate compact, URL-safe Nano IDs with a custom length. Cryptographically secure, runs entirely in your browser.
How to use Nano ID Generator
- 1Choose how many
Set how many Nano IDs to generate (1–100).
- 2Set the length
Pick the ID length (default 21). Longer is more collision-resistant; shorter is more compact.
- 3Generate
Click Generate. Every ID is created locally with your browser crypto API.
- 4Copy
Copy a single ID or use Copy all for the whole batch.
About Nano ID Generator
Nano ID is a tiny, secure, URL-friendly unique-ID generator that has become a popular alternative to UUIDs across JavaScript and many other ecosystems. Its appeal is compactness: a default Nano ID is 21 characters drawn from a 64-symbol URL-safe alphabet (A–Z, a–z, 0–9, plus _ and -), which packs roughly the same collision resistance as a 36-character UUID into a shorter, cleaner string with no hyphens or special characters to escape.
Unlike UUID v7 and ULID, a Nano ID carries no embedded timestamp — it is pure randomness, so it is unguessable and reveals nothing about when or in what order it was created. That makes it a good fit for public-facing identifiers where you do not want to leak creation time or sequence: share links, document and resource IDs, the visible part of tokens, coupon codes, and short slugs. Because the alphabet is URL-safe, Nano IDs slot directly into paths, query strings, and filenames without encoding.
This tool generates Nano IDs entirely in your browser using crypto.getRandomValues, a cryptographically secure source, so the values are safe for security-sensitive use. You can adjust the length to trade compactness against collision resistance: shorter IDs are tidier but collide sooner, longer IDs are safer for high-volume systems. The default of 21 characters is a well-tested sweet spot that matches the practical uniqueness of a UUID v4 for the vast majority of applications.
If you need IDs that sort by creation time, choose UUID v7 or a ULID instead; if you want the shortest possible unguessable identifier with no time signal, Nano ID is the better tool. Nothing you generate is sent to a server — every ID is created locally on your device.
When to use Nano ID Generator
- Short URL slugs
Generate compact, URL-safe identifiers for share links and permalinks.
- Public resource IDs
Expose IDs that reveal no creation time or order, unlike sequential or time-based IDs.
- Coupon and invite codes
Create unguessable codes at a custom length to balance brevity and uniqueness.
- Client-side IDs
Assign an ID in the browser before a record is saved, with no server round-trip.
Frequently asked questions
How is Nano ID different from a UUID?+
Nano ID is shorter (21 vs 36 characters by default), uses a URL-safe alphabet with no hyphens, and is configurable in length. Both are random and unguessable, but Nano ID is more compact and drops into URLs without escaping.
Is the default length safe from collisions?+
Yes. At 21 characters from a 64-symbol alphabet, a Nano ID has about the same collision resistance as a UUID v4 — safe for the overwhelming majority of applications.
Can I change the length?+
Yes. Shorter IDs are tidier but collide sooner; longer IDs are safer for very high-volume systems. Adjust the length field and regenerate.
Does a Nano ID contain a timestamp?+
No. It is pure randomness with no embedded time, so it does not reveal creation time or order. Use UUID v7 or ULID if you need time-sortable IDs.
Is it cryptographically secure and private?+
Yes. IDs use your browser crypto.getRandomValues and are generated entirely on your device — nothing is sent to a server.
Related tools
Generate time-ordered UUID v7 identifiers and decode their embedded timestamp. Free, fast, runs entirely in your browser.
Generate ULIDs — compact, URL-safe, lexicographically sortable IDs — and decode their timestamp. Runs entirely in your browser.
Generate cryptographically random UUID v4 identifiers — single or bulk, instantly.
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