UUID Generator
Generate random v4 UUIDs for databases, sessions, and APIs.
🆔 Generates RFC 4122 v4 UUIDs using the Web Crypto API. Used for unique IDs in databases, sessions, and distributed systems.
What Is This Tool?
A UUID(Universally Unique Identifier) is a 128-bit number used as a unique ID in databases, APIs, sessions, and distributed systems. This generator creates RFC 4122 version 4 UUIDs (random) using your browser's cryptographic random source.
Why UUIDs?
- No central authority — anyone can generate without coordination
- Effectively unique — collision probability is astronomically low
- Used everywhere — databases, OAuth, file systems, message queues
- Anonymous — no embedded sequence or timestamp reveals count/order
The Structure of a UUID
A UUID looks like 550e8400-e29b-41d4-a716-446655440000 — 32 hex digits in 5 groups separated by hyphens. Version 4 (the most common) uses random bits except for a version indicator and a variant indicator.
Common Uses
- Primary keys in databases (especially distributed systems)
- Session tokens and API request IDs
- File names for uploaded content
- Identifying devices, users, or events
Frequently Asked Questions
Are UUIDs truly unique?
For all practical purposes, yes. The chance of two random v4 UUIDs colliding is about 1 in 2.7 × 10^36. You would need to generate billions per second for millennia to see a collision.
About the UUID Generator
The UUID Generator creates uuid generator on demand, right in your browser. Set the options you need, click generate, and the result is ready to copy. Because everything runs locally, nothing you enter or produce leaves your device.
Generators like this are useful when you need a specific output (a password, a UUID, a QR code, placeholder text) and don't want to install an app or trust an unknown website with your data. This tool is free, has no usage limits, and works the same on phone and desktop.
How to Use This Tool
- Set the options the generator exposes (length, format, count, etc.).
- Click the generate button to produce the output.
- Review the result and adjust the options to regenerate if needed.
- Use the copy button to copy the output to your clipboard.
Why Use an Online Generator?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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