Generating a UUID usually means using a library or the command line. The UUID Generator does it in the browser: click to get one or many UUID v4 values—no sign-up and no data sent to a server.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUID v4 is randomly generated, making collisions extremely unlikely (about 1 in 5.3 × 10^36). The tool needs no input: click to generate one or many UUIDs. Optionally set how many to generate and copy in bulk. Generation is done locally: UUIDs are generated in your browser using a cryptographically secure source. Nothing is sent to a server. Use it for unique IDs in databases, API request IDs, distributed systems, or any place you need a globally unique identifier.
Key Features
- UUID v4 — Randomly generated. Collisions extremely unlikely. No input required.
- Single or bulk — Generate one UUID or many. Optionally set count and copy in bulk.
- URL-safe — Yes. UUIDs are URL-safe. Use them for resource IDs, invite links, or tokens. Hyphens can be removed for shorter strings if needed.
- Local generation — Yes. UUIDs are generated in your browser using a cryptographically secure source. Nothing is sent to a server.
- No account — Use as often as you need without sign-up.
- Copy-friendly — Copy one or paste a list into your app or config.
How to Use the UUID Generator
- Open the UUID Generator tool.
- Click to generate one UUID, or set how many to generate (e.g. 10). Copy one or all. Use the "Use tool" button on the docs page if you are reading this from the documentation.
Real Use Cases
- Unique IDs in databases — Generate primary keys or external IDs for records. No central server needed.
- API request IDs — Create a unique ID for each request for tracing or idempotency.
- Distributed systems — Generate IDs across services without coordination. UUID v4 avoids collisions with very high probability.
- Resource IDs — Use UUIDs in URLs for resources (e.g. /users/550e8400-e29b-41d4-a716-446655440000). URL-safe.
- Invite links or tokens — Use a UUID as part of a one-time link or token. Hyphens can be removed for shorter strings if needed.
- Testing — Generate bulk UUIDs for test data or fixtures.
Why Use the UUID Generator Instead of Alternatives?
- vs. Password Generator — Password Generator creates random passwords. This tool creates UUIDs. Use the one that matches your need (identifier vs secret).
- vs. Random Number Generator — Random Number Generator gives numeric ranges. UUIDs are 128-bit identifiers in a standard format. Use UUIDs when you need a globally unique ID.
- vs. Hash Generator — Hash Generator hashes input. UUIDs need no input. Different purpose.
- vs. Scripts — No coding. Works in any browser.
UUIDs are URL-safe. Use them for resource IDs, invite links, or tokens. Hyphens can be removed for shorter strings if needed.
Benefits for Developers, DevOps, and Testers
- Developers — Generate UUIDs for apps or APIs without a library or script.
- DevOps — Create unique IDs for config, logs, or resources.
- Testers — Bulk-generate UUIDs for test data.
Common Mistakes
- Expecting custom format — UUID v4 has a fixed format (8-4-4-4-12 hex). For other formats use a custom generator or transform.
- Using for passwords — UUIDs are not secret; they are identifiers. For secrets use Password Generator.
- Removing hyphens — Some systems expect hyphens; others prefer no hyphens. Remove if your system requires it.
- Forgetting to copy — The result is not saved. Copy before closing the tab.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time.
What is UUID v4?
UUID v4 is randomly generated, making collisions extremely unlikely (about 1 in 5.3 x 10^36).
None. Click to generate one or many UUIDs. Optionally set how many to generate and copy in bulk.
Is generation done locally?
Yes. UUIDs are generated in your browser using a cryptographically secure source. Nothing is sent to a server.
When should I use a UUID generator?
Use it for unique IDs in databases, API request IDs, distributed systems, or any place you need a globally unique identifier.
Can I use UUIDs in URLs?
Yes. UUIDs are URL-safe. Use them for resource IDs, invite links, or tokens. Hyphens can be removed for shorter strings if needed.
UUID Generator gives you one or many UUIDs in seconds: click, copy. No account, no server round-trip. For passwords use Password Generator, for random numbers use Random Number Generator, and for hashes use Hash Generator.
Use the UUID Generator tool to generate UUIDs.