How to generate UUID v4 online for free

Generating UUID v4 online is useful when you need quick IDs for database seeds, test fixtures, or API payloads without opening a REPL. Prefer a tool that runs in your browser so generation stays on your device.

Generate UUID v4 with Jigglify (30 seconds)

1. Open the UUID generator.
2. Set the count (1-100) if you need a bulk list.
3. Click Generate.
4. Copy one UUID or the full list to your clipboard.

What "v4" means in practice

Version 4 UUIDs are random (aside from the fixed version and variant bits). Jigglify uses crypto.randomUUID() in the browser, which produces RFC 4122-compatible v4 strings. Each click yields new independent IDs - regenerating does not reuse previous values.

Bulk generation tips

• Use bulk mode for seed scripts, CSV fixtures, and migration dry-runs.
• Paste into a spreadsheet or file as one UUID per line for easy imports.
• Enforce uniqueness in your database if the column is a primary or unique key - good practice even when collisions are astronomically unlikely.

Other ways to generate v4 UUIDs

• Browser / Node: crypto.randomUUID()
• Linux: uuidgen -r (random)
• Language libraries: uuid packages in Python, Go, Java, and others

Generate UUID v4 free - one ID or a bulk list, privately in your browser.
Open the free UUID generator →

Related: What is a UUID? · UUID v4 vs v1