UUID Generator
Generate UUID v4 (random) or UUID v7 (time-ordered) in bulk — up to 1000 at a time. Uppercase, no-hyphens, brace-wrapped variants supported. Cryptographically secure, in-browser.
How It Works
Using UUID Generator in 3 Steps
Choose Version & Count
Pick UUID v4 (random) or UUID v7 (time-ordered), and set how many you need — up to 1000 in one click.
Tune the Format
Toggle uppercase, strip hyphens, or wrap with braces (Microsoft GUID style) — combine any options.
Copy Individually or in Bulk
Each UUID has a per-row copy button. 'Copy all' grabs the whole list as newline-separated text — ideal for seeding databases and tests.
Use Cases
Who Uses UUID Generator?
Backend Developers
Seed databases, generate test fixtures, or grab a quick stable identifier without writing a one-off script.
QA Engineers
Create predictable test data for parametrised tests where unique IDs are needed but specific values aren't.
DevOps & SREs
Generate request IDs, deployment IDs, or migration markers ad-hoc during incident response and runbook execution.
FAQ
UUID Generator — Frequently Asked Questions
Everything you need to know before you start.
What's the difference between UUID v4 and v7?
UUID v4 is fully random and unsorted. UUID v7 is time-ordered — it includes a Unix-millisecond timestamp at the start, which makes it index- and sort-friendly for databases. v7 is the modern recommendation for new systems.
Are these UUIDs safe to use as primary keys?
Yes. They are generated using the Web Crypto API (crypto.randomUUID), which is cryptographically secure. Collisions are mathematically negligible — you would need ~2.71 quintillion v4 UUIDs to have a 50% chance of one duplicate.
What's the NIL UUID for?
The NIL UUID (00000000-0000-0000-0000-000000000000) is a special placeholder defined by RFC 4122 and used as a sentinel for 'no UUID yet' in databases, fixtures, and tests. The MAX UUID (all f's) is its opposite, used in test bounds.
How many can I generate at once?
Up to 1000 per click. They're generated locally — no rate limits, no signup, no captcha.