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UUID Generator

Generate UUIDs (v1/v4/v5), ULID, KSUID, and NanoID — single or in bulk, formatted, and exportable.

Options

Generated

No batch yet — generate one from the options pane.

About this UUID/ID generator

This tool generates unique identifiers (UUIDs, ULIDs, NanoIDs, KSUIDs) that can be used in databases, APIs, distributed systems, or anywhere you need guaranteed uniqueness. It supports both synchronous generation and background generation with a Web Worker, so large batches of IDs won’t freeze your UI.

Supported ID types

  • UUID v1 – includes timestamp + random node data.
  • UUID v4 – purely random 128-bit identifier.
  • UUID v5 – name-based UUID using SHA-1 hashing.
  • ULID – sortable unique IDs with timestamp + randomness.
  • NanoID – URL-friendly short unique strings.
  • KSUID – time-sortable 27-char unique identifiers.

Batch generation: you can generate multiple IDs at once. When using the worker option, progress is shown as IDs are created. This ensures the main thread remains responsive even when generating thousands of identifiers.

Extra features

  • Add prefix or suffix to customize IDs.
  • Toggle uppercase or remove dashes for compact formats.
  • Quick actions: copy to clipboard, generate QR codes, or reset history.

Why Web Workers? Normally, generating thousands of UUIDs can block the UI. By moving the heavy lifting into a Web Worker, this tool offloads the work to a background thread. That means smooth UI updates, live progress tracking, and better performance for large batches.

Tip: UUID v4 is best for general randomness, UUID v5 when you need deterministic results from the same input, and ULID/KSUID when you want IDs that sort nicely by time.

Developer Utilities

About UUID Generator

Generate random UUID v4 identifiers for unique references or database keys. DevTools provides focused browser-based developer utilities so you can validate inputs, inspect payloads, copy results, and move between related utilities without installing local dependencies or configuring heavy toolchains.

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Frequently asked questions

What is UUID Generator?
UUID Generator is a free online developer utilities tool. Generate random UUID v4 identifiers for unique references or database keys.
Is UUID Generator free to use?
Yes. UUID Generator is 100% free in your browser with no required sign-up, rate limits, or paywalls.
Who is UUID Generator useful for?
UUID Generator is built for developers, testers, technical writers, product engineers, students, and DevOps teams who need reliable, fast browser utilities for everyday development work.
Is data processed securely in the browser?
Yes. All core formatting, encoding, generation, and inspection operations happen locally in your browser client sandbox without sending confidential payloads to external servers.