v4 vs v7 — which should I use?

v4 is fully random and unique. v7 embeds the current timestamp at the start, so values sort chronologically — much better for database indexes and pagination cursors. Use v7 for new schemas.

What's the collision risk for v4?

Effectively zero. You'd need to generate ~2.71 quintillion UUIDs before there's a 50% chance of any collision.

Are UUIDs cryptographically random?

v4 UUIDs from this tool come from the browser's crypto.getRandomValues() — the same source used for cryptographic keys. They're suitable as session tokens.

Can I use UUIDs in URLs?

Yes — they're URL-safe ASCII. For shorter URLs consider Base62 encoding (22 chars) or nanoid.

UUID Generator — Free Online Tool

What is the UUID Generator?

The UUID Generator is a free online uuid generator from Markvibe. Generate v4 UUIDs in bulk. It runs entirely in your browser — your data never gets uploaded — and works on desktop, tablet and mobile with no sign-up.

Reviewed by The Markvibe Team · Last updated 2026-06-28

Example

A worked example so you know exactly what to expect.

Input

(generate 1)

Output

550e8400-e29b-41d4-a716-446655440000

How to use UUID Generator

1Pick a UUID version: v4 (random — default), v7 (time-ordered, ideal for database primary keys), v1 (timestamp + MAC) or NIL.
2Choose how many UUIDs to generate at once (1 to 10,000).
3Toggle uppercase, hyphenless, or curly-brace {GUID} format to match Microsoft conventions.
4Hit Generate, then Copy All — or copy a single row with the inline copy button.
5Download the batch as .txt or .csv for use in seed data and migrations.

Why use our UUID Generator

✓ 100% free UUID Generator — no sign-up, no watermark, no hidden limits
✓ Runs entirely in your browser so your data never leaves your device
✓ Blazing-fast results — built for speed by Markvibe
✓ Mobile-friendly: use UUID Generator on phone, tablet, or desktop
✓ One of 184+ uuid generator utilities under one roof
✓ Privacy-first: no tracking of inputs, no accounts, no ads in the tool area

UUID Generator — frequently asked questions

UUID v7 Generator

Generate time-ordered UUIDv7 identifiers.

See all UUID Generator tools →

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