UUID & NanoID Generator
Generate cryptographically secure identifiers (UUID v4, UUID v7, or NanoID) directly in your browser. No data is sent to any server.
UUID / NanoID Generator Settings
Generated IDs (0)
The generated IDs will be output here.
Collision & sortability
For this batch size the mathematical collision risk is extremely small.
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Guide & best practices
UUID Generator for v1, v4 and v7
Generate unique identifiers in several UUID versions – locally in the browser, single or in batch.
Typical use cases
Useful for database IDs, correlation/trace IDs, test data and distributed systems without central ID assignment.
How Balou generates UUIDs
Choose version and count plus format options; Balou generates the UUIDs locally in the browser.
UUID best practices
Use v4 for random IDs, v7 when time sortability is desired and avoid v1 if MAC/time should not be exposed.
Frequently asked questions
v4 vs v7 – when to use which?
v4 is purely random, v7 includes a timestamp and is therefore sortable – ideal as a database key with good index locality.
Are UUIDs guaranteed unique?
Not mathematically guaranteed, but the collision probability for v4/v7 is practically negligible.
What distinguishes v1 from v4?
v1 is based on time and (often) MAC address, v4 on randomness; v4 exposes no hardware/time information.
Are the UUIDs generated server-side?
No, generation runs locally in the browser.