Nano ID generator

Client

Nano ID strings are short, URL-safe, and collision-resistant for typical web workloads. Compare with UUID and ULID when you care about sortability or strict RFC formats.

When Nano ID fits

Default length 21 mirrors the common Nano ID default—good for public IDs in URLs and logs. Shorten only when your collision risk model accepts a smaller space; lengthen when a paranoid margin helps you sleep.

How to use this page

Set Count (1–100) and Length (2–64), then Generate. Tokens use a fixed URL-safe alphabet (digits, letters, -, _) so they are easy to paste into URLs and logs. Copy all joins lines with newlines—trim or split in your editor if you need CSV.

Nano IDs

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URL-safe tokens (default length 21). Generated only in your browser—compare with UUID v4 and ULID for sortability and charset.

  • Wdubh4WUqf0u6c_ju8b-b
  • _9yqhmEb_kMJhONnrFlHJ
  • Hq0FCTyQ45HoUS3qQq1Rs
  • FjvXUcQEEv1MzJYTYdhYz
  • 0eMQ-Hp9ZPmkVWNKbiorB

Common use cases

  • Seed integration tests with unique string keys without a central id service.
  • Generate opaque tokens for UI mocks where UUID length feels noisy.
  • Create a batch of client-side correlation IDs for log excerpts or support tickets before you wire a real id generator in the backend.

Common mistakes to avoid

  • Confusing Nano ID with UUID bytes

    They solve similar problems but have different alphabets and entropy per character—do not mix schemes in one primary key column without a migration story.

  • Short IDs in high-volume or long-lived systems

    Collision probability grows with how many IDs you mint and how long they live. Prefer the default length—or longer—when the namespace is huge or permanent.

FAQ

Are IDs generated on Toolcore servers?

No. Randomness and string building run only in your tab.

Is this exactly the same as the npm `nanoid` package?

Length 21 uses the same default generator as the library. Other lengths use `customAlphabet` with a URL-safe set; always verify entropy against your own threat model for production keys.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • nanoid generator online
  • url safe id generator
  • short unique id generator browser

More tools

Related utilities you can open in another tab—mostly client-side.