Is this UUID generator free?

Yes. Completely free with no signup or limits.

No. UUIDs are generated locally using your browser's crypto API.

Version 4 UUIDs use random numbers. 122 bits of randomness make collisions extremely unlikely.

Can I generate multiple UUIDs?

Yes. Batch mode generates many UUIDs at once with copy-all or .txt download.

Can I use it commercially?

Yes. Free for personal and commercial use.

Are these UUIDs truly random?

Yes. Generated via crypto.getRandomValues, the same API used for secure key generation.

UUID Generator

UUID v4

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Batch generate

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What is UUID Generator?

UUID Generator is an online tool that creates Universally Unique Identifiers (UUIDs) for use as database primary keys, session IDs, API tokens, and distributed system trace identifiers. UUID v4 uses random numbers, making collisions statistically negligible even across billions of generated values.

Unlike sequential IDs, UUIDs can be generated independently on any machine without coordination. This makes them ideal for microservices, offline-first apps, and test data generation. Developers need UUIDs when creating mock data, setting up database schemas, or debugging distributed tracing systems.

WaiHub's UUID Generator creates UUID v4 values in your browser using crypto.getRandomValues for cryptographically strong randomness. Generate a single UUID or batch hundreds with uppercase, braceless, or braced format options. Copy individually or download as a text file — all without server upload.

Cryptographically random UUID v4
Batch generation up to hundreds
Uppercase, no-hyphens, and braced formats
Copy single or download batch as .txt
No coordination needed across systems
Privacy-first browser generation

Features

Generate UUID v4 instantly
Batch mode for multiple UUIDs
Uppercase format option
Remove hyphens option
Add curly braces {uuid} format
Copy single UUID with one click
Copy all or download as .txt
Uses crypto.getRandomValues
Independent single and batch generators
Works locally in browser

How To Use

Generate a single UUID
Click the generate button at the top to create one UUID v4. Copy it directly for immediate use.
Set batch options
Choose how many UUIDs to generate, and toggle uppercase, no-hyphens, or braced format as needed.
Generate batch
Click Generate to create the full batch. Each UUID is independently random and collision-resistant.
Copy or download
Copy all UUIDs to clipboard or download as a .txt file for import into databases or test scripts.

Examples

Standard v4

Format

uuid-v4

Generated UUID

f47ac10b-58cc-4372-a567-0e02b2c3d479

Uppercase

Format

uppercase

Generated UUID

F47AC10B-58CC-4372-A567-0E02B2C3D479

FAQ

Is this UUID generator free?: Yes. Completely free with no signup or limits.
Is my data uploaded?: No. UUIDs are generated locally using your browser's crypto API.
What is UUID v4?: Version 4 UUIDs use random numbers. 122 bits of randomness make collisions extremely unlikely.
Can I generate multiple UUIDs?: Yes. Batch mode generates many UUIDs at once with copy-all or .txt download.
Can I use it commercially?: Yes. Free for personal and commercial use.
Are these UUIDs truly random?: Yes. Generated via crypto.getRandomValues, the same API used for secure key generation.