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Nano ID Generator - Online Compact Unique IDs

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Nano ID Generator

Generate compact, unique, URL‑friendly IDs for databases, tokens, and more.

Try these examples: V1StGXR8_Z5jdHi6B-myT kMH2X5f7ovP9eRkT w9A7s2D

Frequently Asked Questions

Nano ID is a tiny, secure, URL‑friendly unique string ID generator. It produces compact identifiers with higher performance and smaller bundle size compared to UUID. The default length is 21 characters and the alphabet contains 64 symbols, giving a huge number of possible combinations.

UUIDs are long (36 characters) and contain dashes, while Nano IDs are shorter and more customisable. Nano ID uses a larger alphabet (64 characters) which makes IDs shorter for the same collision resistance. It’s also designed to be faster and relies on cryptographic randomness.

By default Nano ID uses a cryptographically strong random generator (crypto.getRandomValues). With 21‑character IDs from a 64‑symbol alphabet, the collision probability is extremely low. For most applications the risk is negligible; you’d need to generate billions of IDs to have a measurable chance of collision.

Absolutely. This tool lets you choose from presets like digits, letters or hexadecimal, or type your own custom alphabet. You can also set any length between 1 and 100 characters. Custom alphabets let you generate IDs tailored to specific systems (e.g., only uppercase letters and numbers).

The recommended length is 21 characters (default), which provides excellent collision resistance. For smaller datasets or short‑lived tokens you may use 10–12 characters. For highly sensitive applications, consider 36 or more. Always match the ID length to your expected volume and security requirements.

Yes. The default alphabet uses characters that are safe in URLs without encoding: letters, digits, underscore and hyphen. No special handling is required when embedding Nano IDs in query strings or paths.

This generator allows you to create up to 100 IDs in one click. Each ID is produced independently using fresh random values, so you can quickly populate a list of unique identifiers.

Short ID is another tiny ID generator, but it often uses a smaller alphabet and sequential counters. Nano ID focuses on randomness and uniformity, making it more suitable for security‑sensitive contexts where unpredictability matters.
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