UlvixorUUID v4 Generator
Generate random, secure universally unique identifiers (UUIDs), version 4, using your browser's native cryptographic API. Generate one or up to 50 at a time and copy or download them in a single step.
How it works
- Choose how many UUIDs you want to generate (between 1 and 50).
- Click 'Generate UUIDs' to create the list.
- UUIDs are generated with crypto.randomUUID(), your browser's native, cryptographically secure API.
- Copy all the UUIDs at once (one per line) or download them as a .txt file.
Use cases
- Generate unique identifiers for database records.
- Create primary keys or session IDs for testing and prototypes.
- Generate seed data for development and testing.
- Quickly grab several unique identifiers for naming files or resources.
Use cases
- Generate unique identifiers for database records.
- Create primary keys or session IDs for testing and prototypes.
- Generate seed data for development and testing.
- Quickly grab several unique identifiers for naming files or resources.
Common mistakes
- Using Math.random() to manually generate 'unique' IDs.Math.random() isn't cryptographically secure and can repeat values. This tool uses crypto.randomUUID(), built specifically for this purpose.
- Using UUID v4 and expecting them to be sortable by creation date.A UUID v4 is completely random and contains no time information. If you need sortable IDs, look into UUID v7 or ULID instead.
- Accidentally pasting the same UUID into multiple records by hand.Generate one UUID per record; the tool lets you create up to 50 at once to avoid this kind of mistake.
Frequently asked questions
It's a 128-bit universally unique identifier generated pseudo-randomly. The odds of two independently generated UUID v4s colliding are practically zero, which makes them ideal as unique identifiers.
Yes. They're generated with crypto.randomUUID(), your browser's native API based on a cryptographically secure pseudo-random number generator (CSPRNG), not Math.random().
No. All UUIDs are generated and stay entirely in your browser. Nothing is sent to or saved on an external server.
You can generate between 1 and 50 UUIDs per operation. If you need more, just run it again and combine the results.
Alternatives
Most programming languages (uuid4() in Python, crypto.randomUUID() in Node, UUID.randomUUID() in Java) generate UUID v4 natively with no external dependencies. This tool is useful for quickly generating several without writing code, for example when preparing test data.