Generate compact URL-safe random IDs with configurable length and count.
Updated
Quick start
Choose length and count, then generate IDs.
Pick ID length and quantity.
Produce URL-safe random IDs.
Use IDs in apps or test data.
In-depth guide
A Nano ID is a short random string built from a URL-safe alphabet — ideal for public record IDs, short links and temporary tokens where a long UUID would be clumsy. This tool generates them in your browser using the cryptographically secure random source.
Each character is drawn at random from a 64-symbol URL-safe alphabet — A–Z, a–z, 0–9, plus _ and -. The randomness comes from crypto.getRandomValues, the browser's CSPRNG, not Math.random, so the output is suitable for identifiers that should not be guessable.
Each character adds 6 bits of entropy, so the default 21-character ID has about 126 bits — comparable to a UUID v4 and effectively collision-free even at billions of IDs. Shorten it for friendlier URLs only if your volume is modest; raise the length when you generate enormous numbers of IDs and need collision probability to stay vanishingly small.
IDs are generated entirely in your browser — nothing is sent to a server. Because they are random, do not rely on them to encode order or timestamps the way some other ID schemes do.
Use this tool for quick browser-based work when you need an answer or output immediately. Use a dedicated application or automated workflow when you need bulk processing, approvals, or repeatable production rules.
A URL-safe alphabet of A-Z, a-z, 0-9 plus underscore and hyphen, so the IDs need no escaping in URLs.
Yes. Up to 100 IDs per run in this tool.
Yes. They are generated with crypto.getRandomValues, the browser's cryptographically secure random source.
Each character adds about 6 bits of entropy. The 21-character default has roughly 126 bits, comparable to a UUID v4 and effectively collision-free.
Yes, but only safely at modest volumes. Shorter IDs raise the collision chance, so increase length when generating very many IDs.
No. They are purely random, so unlike some ID schemes they carry no embedded time or sequence information.
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