Free tool · Dev Utilities
UUID Generator
Generate one or more random UUIDs (v4).
Generate cryptographically random version-4 UUIDs, the standard unique identifier format used in databases, APIs, and distributed systems. Generate a single UUID or a batch of up to 100 at once, using your browser’s built-in secure random number generator, then copy them all or download as a text file with one click.
- Files never leave your device
- Runs entirely in your browser
- Free, no account needed
How to use UUID Generator
Two steps, and nothing to install.
Choose how many
Enter how many UUIDs you need, from 1 to 100.
Copy or download
Click Generate, then Copy all to your clipboard or Download as a text file.
More free tools
Free, private, and no sign-up on any of them.
How this works in your browser
This tool uses crypto.randomUUID(), the Web Crypto API built into every modern browser, which generates a version-4 UUID from a cryptographically secure random source rather than a predictable pseudo-random one. No library is loaded and nothing is transmitted; each UUID is created locally the instant you click Generate.
UUID Generator vs. upload-based online tools
| Feature | UUID Generator (in-browser) | Upload-based online tools |
|---|---|---|
| File upload required | No - never leaves your device | Yes - file is sent to a server |
| Processing queue | None - starts instantly | Often, especially at peak times |
| Watermark on output | Never | Common on free plans |
| Usage limits | None - free, unlimited use | Often capped per day or file size |
| Works offline once loaded | Yes, for most tools | No - requires a live connection |
| Account required | No | Often, for anything beyond a trial |
Who uses UUID Generator
Backend and database developers
Generate primary keys or unique identifiers for test data, seed scripts, or a new database schema.
API testing
Quickly grab a batch of unique IDs to use as request payloads or mock data.
Anyone needing a unique filename or token
Generate a single UUID on the spot without opening a terminal or writing a one-line script.
Frequently asked questions
What it can and cannot do, and what happens to your files.
Is this UUID generator free?
Yes, completely free with no limit on how many UUIDs you generate.
Are these UUIDs guaranteed to be unique?
Version-4 UUIDs use 122 random bits, making collisions astronomically unlikely in practice, the same standard used by most databases and APIs.
Can I generate more than one at a time?
Yes, choose how many UUIDs to generate in a single batch, up to 100 at once.
How do I copy them all at once?
Click "Copy all" to copy every generated UUID to your clipboard in one go, or use Download to save them as a text file.
What generates the randomness?
Your browser’s built-in cryptographically secure random number generator (crypto.randomUUID).
Generate a UUID - free and instant.
Files never leave your device. No upload, no account, and free for unlimited use.