About UUID Generator
Create one or many cryptographically secure identifiers with casing and hyphen formatting controls.
The generator uses cryptographically secure browser randomness for UUID v4 and combines a millisecond timestamp with random bits for UUID v7. You can create batches and adjust casing or hyphen display.
How to use it
- Enter or select your source data.
- Adjust the available options and run the tool.
- Review, copy, or download the result.
Common use cases
- Create identifiers for fixtures, migrations, or local prototypes.
- Generate time-sortable UUID v7 values for database experiments.
- Produce batches of GUID-compatible strings for test imports.
Worked example
Generate 50 lowercase UUID v7 values without hyphens.
Limitations and responsible use
- Generated identifiers are not registered in or checked against your database.
- UUID v7 exposes approximate creation time by design.
- Removing hyphens or changing case affects presentation, not the underlying 128-bit value.
Frequently asked questions
Which version should I choose?
Use v4 for purely random identifiers and v7 when chronological database ordering is useful.
Can two generated UUIDs collide?
A collision is theoretically possible but extraordinarily unlikely with correctly generated UUIDs.