UUID Generator

Overview

Generate multiple UUID v4 values at once. It uses the browser crypto.randomUUID() API for proper randomness and offers format options like including or removing dashes and toggling uppercase. Handy for preparing test data or DB seeding without opening a terminal.

Key Features

• Bulk UUID v4 generation (1 to 100)
• Option to include or remove dashes
• Uppercase / lowercase toggle
• Copy individual UUIDs or all at once
• Duplicate check indicator

How to Use

1. Set how many UUIDs to generate.
2. Choose format options: dashes on/off, upper/lower case.
3. Click Generate to get the UUID list.
4. Use individual or bulk copy buttons to grab them.

Tips

• UUID v4 has 122 random bits, making collision probability virtually zero.
• For DB primary keys, the 32-character no-dash format can be more index-friendly.
• Pre-generate UUIDs here when you need hard-coded values for test code.

FAQ

Can I generate UUID v1 or v5?

Currently only UUID v4 (random-based) is supported. v1 (timestamp-based) and v5 (namespace-based) may be added later.

Are the generated UUIDs truly unique?

They use the browser cryptographic random number generator (crypto API), so the collision probability is astronomically low. In practice, duplicates are not a concern.

Is a UUID without dashes still valid?

Dashes are just a display convention. A 32-character hex string without dashes represents the same UUID. Many systems store them without dashes.