How to Generate UUIDs in Bulk
- Choose between UUID v4 (Random) or UUID v7 (Time-Ordered) depending on your database or API requirements.
- Select how many identifiers you need (1, 5, 10, 25, or 50).
- Optionally format with UPPERCASE, strip hyphens, or wrap in curly braces
{...}. - Click Copy on any single ID, click Copy All, or export directly as
.txtor.json.
UUID v4 vs. UUID v7 Comparison
| Version | Structure | Sortability | Best Use Case |
|---|---|---|---|
| UUID v4 | 122 random bits + 6 version/variant bits | Random (unsorted) | Session tokens, public API keys, non-sequential IDs |
| UUID v7 | 48-bit Unix ms timestamp + 74 random bits | Chronological (K-sortable) | PostgreSQL / MySQL primary keys, distributed event logs |
Frequently Asked Questions
Can two UUID v4 strings ever collide?
A UUID v4 has 2122 (approximately 5.3 × 1036) possible combinations. You would need to generate 1 billion UUIDs every second for roughly 85 years to have a 50% chance of a single collision.
Are these UUIDs logged or stored anywhere?
No. All identifiers are generated locally in your browser using the Web Crypto API and are never transmitted over the network.