Add your input
The number of UUIDs you need.
Code drawer
UUID generator
Create identifiers with the browser's secure random source.
Privacy built inYour work stays with you
Version 4 UUIDs
Choose a quantity, then generate cryptographically random UUIDs.
Your work stays private in your browser while you use this tool.
What does uuid generator do?
Generate between 1 and 100 random UUID version 4 values with the browser's crypto.randomUUID(), then display them in lowercase or uppercase with or without hyphens.
- Input
- The number of UUIDs you need.
- Result
- A copy-ready list of UUID v4 values.
- Price
- Free
- Account
- Not required
How to use uuid generator
Choose your settings
Create identifiers with the browser's secure random source.
Save or copy
A copy-ready list of UUID v4 values.
A practical tip
UUIDs are excellent identifiers, but they are not passwords or proof of authorization.
When to use uuid generator
Create test identifiers for fixtures, seed data, or mock API objects.
Prepare several correlation IDs for a local development workflow.
Generate a canonical hyphenated v4 UUID before inserting a new database record manually.
Worked example
A concrete uuid generator example
- Input
- Quantity 1
- Settings
- Lowercase with hyphens
- Result
- One random value such as 9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d is produced. Your value will differ; the 4 marks version 4 and the leading bits of the next group encode the RFC variant.
What to expect
How it works
The requested count is floored and clamped to 1–100. The page calls crypto.randomUUID() once per item, stores the canonical values, and applies uppercase or hyphen removal only as a display transformation before copy or download.
Know before using
Limits and edge cases
- The generator is capped at 100 values per run and provides no deterministic namespace, seed, version 5, version 7, or bulk-file import workflow.
- A UUID is an identifier, not a password, bearer secret, authorization decision, or proof that a record exists. Removing hyphens may also conflict with systems that require canonical text form.
Standards and sources
Common questions
UUID generator FAQ
Is uuid generator free to use?
Yes. UUID generator is free to use.
Does uuid generator keep my work private?
Yes. Your work stays private while you use the tool — nothing you enter is uploaded.
Are uppercase and no-hyphen UUIDs newly generated values?
No. Those controls only change how the same generated bytes are displayed. Toggling them does not request fresh randomness.
Can a generated UUID be used as an API key?
It should not be treated as one. UUID uniqueness and random generation do not by themselves provide key lifecycle, secrecy, permissions, revocation, or secure comparison.