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ID

UUID / ULID / Nano ID

DevOffline-ready

UUID Generator creates RFC 4122-compliant UUID v4, time-sortable ULID, and URL-safe Nano ID values in one click. Generate a single identifier or up to 1 000 in bulk, toggle between hyphenated and uppercase formats, and copy everything to the clipboard at once. All values are created using the browser's cryptographically secure random number generator — no server call is made and the IDs are never logged.

Related: HashPassSemVer

Your files and inputs stay in your browser — nothing is uploaded or stored.

Click Generate to create IDs

How to use the UUID Generator

  1. Select the ID type: UUID v4 (random, widely compatible), ULID (time-sortable), or Nano ID (compact, URL-safe).
  2. Click Generate to produce a single identifier — or enter a number in the Bulk field to generate up to 1 000 at once.
  3. Toggle Uppercase or No hyphens to change the output format for your use case.
  4. Click Copy All to copy all generated IDs to the clipboard, one per line.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value formatted as 32 hexadecimal digits in the pattern xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx. The most widely used version is UUID v4, which is randomly generated — the probability of generating two identical UUIDs is astronomically small (1 in 5.3 × 10³⁶). UUIDs are used as primary keys in databases, request correlation IDs, file names, and anywhere a unique identifier is needed without coordination between services.

UUID v4 vs ULID vs Nano ID

When to use each

Use UUID v4 for interoperability and database-native support. Use ULID when you need time-ordered IDs for efficient B-tree indexing. Use Nano ID for short identifiers in URLs, API keys, or client-side generated IDs where compactness matters.