UUID Generator Online
Create version 4 UUIDs for database keys, test fixtures, and request IDs. Values come from the browser's CSPRNG and are not logged on a server.
How to use UUID Generator
Drop the text, table, or snippet that needs uuid generator into the input box.
Toggle the checkboxes or fields if the tool offers them, then watch the output update.
Use Copy or Save. Because this runs locally, you can work on private data without an account.
Why use this tool?
The Problem
Apps need unique IDs that will not collide. Sequential integers leak counts and collide across shards.
The Solution
This generator emits RFC 4122 v4 UUIDs using crypto.getRandomValues, optionally several at once.
Common Use Cases
- Seed test databases
- Issue request IDs
- Fill fixture files
How it works
Sixteen random bytes are drawn, version and variant bits are set, then the value is formatted 8-4-4-4-12. All calculations and text processing routines execute locally using standard JavaScript inside your browser. No contents are uploaded to any server.
Before / After Example
count = 3
550e8400-e29b-41d4-a716-446655440000 6fa459ea-ee8a-4ca4-894e-db77e160355e
Tips & Best Practices
v4 UUIDs are random, not time-ordered. Use a ULID if you need sort-by-time keys.
Common Mistakes
Do not paste a UUID into this box expecting it to validate — it generates new values. The input field is unused.
Frequently Asked Questions
How do I use UUID Generator online?
Paste your input into UUID Generator, adjust any options, and copy the result. Generate random RFC 4122 v4 UUID keys. All processing stays in the tab.
Does UUID Generator upload my data?
No. UUID Generator runs in your browser with JavaScript. Answer to Geek does not receive the text, CSV, tokens, or files you paste.
Are these UUIDs unique enough for production?
v4 UUIDs from a cryptographic RNG are standard for most apps. Collisions are astronomically unlikely. This page cannot guarantee uniqueness across other systems.
What should I try after UUID Generator?
Related tools on this site include hash generator, lorem ipsum, jwt decoder. Open those when you need a follow-up transform on the same data.