Every ID is generated in your browser with the Web Crypto random number generator, so nothing is uploaded and the tool works offline once the page has loaded. It uses NanoID's uniform algorithm, which masks and rejects random bytes instead of taking a plain remainder, so no character is more likely than another and the IDs stay unbiased. Change the length, switch the alphabet to lowercase, hexadecimal or a no-look-alike set, or paste your own characters, and generate up to a thousand IDs at once.
Free NanoID Generator
Runs entirely in your browser - no upload, no sign-up.
Edit characters64 distinct characters
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What is a NanoID generator?
A NanoID generator creates short, URL-friendly unique string IDs using a cryptographically secure random source. NanoID is a tiny alternative to UUID: a default ID is 21 characters from a 64-symbol alphabet, giving you compact, collision-resistant identifiers for database rows, URLs, tokens and filenames, all built locally in your browser.
How to use
- 1Pick an alphabet. Keep the URL-friendly default, or choose lowercase, hexadecimal, numbers or a no-look-alike set - or paste your own characters.
- 2Set length and quantity. Choose how many characters each ID has (21 by default) and how many IDs to generate at once.
- 3Generate. Press Generate to build a fresh batch. The possible-IDs and collision-safety figures update to match your settings.
- 4Copy what you need. Click Copy on any single ID, or Copy all to grab the whole list, one ID per line.
Who it's for
- Backend developers creating primary keys or public row IDs that are shorter and more URL-friendly than a UUID.
- Frontend and full-stack engineers generating client-side keys for React lists, optimistic inserts, or draft records before a save.
- API and platform teams minting share links, invite codes, API keys and short slugs that are safe to drop straight into a URL.
- QA and data engineers seeding test fixtures and mock records with a batch of unique identifiers in one click.
- DevOps and scripters grabbing a quick random token or filename suffix without installing a library or writing code.
FAQ
Is the NanoID generator free?
Yes, it is completely free with no sign-up and no limits. Every ID is generated in your browser, so you can create as many batches as you like, even offline once the page has loaded.
How is NanoID different from a UUID?
A UUID is a fixed 36-character format. NanoID is smaller and configurable: the default is 21 URL-safe characters, roughly 40% shorter, with a similar collision resistance. NanoID also lets you change the length and alphabet, while a UUID's format is fixed.
Are the generated IDs cryptographically secure?
Yes. IDs use the browser's Web Crypto getRandomValues, the same secure random source used for keys and tokens, and NanoID's uniform algorithm keeps every character equally likely so the output is not biased or predictable.
What is the default NanoID alphabet?
The default alphabet has 64 URL-friendly symbols: A-Z, a-z, 0-9 plus underscore and hyphen. Because every character is safe in a URL, you can drop an ID straight into a link, filename or path without encoding it.
How long should a NanoID be?
Twenty-one characters is the default and is safe for almost any use, matching UUID-level collision resistance. Shorter IDs are fine for low-volume data or human-facing codes, but the smaller keyspace raises collision risk, so watch the collision figure before shortening.
Can I use my own characters?
Yes. Pick Custom, or just edit the character box, and IDs are built from exactly the characters you enter. Duplicate characters are ignored and you can use any distinct symbols, up to 256 of them.
Are my generated IDs uploaded anywhere?
No. Everything is generated locally in your browser with the Web Crypto API and nothing is sent to a server, so your IDs stay private on your device.