UUID Generator
Generate unique identifiers (UUID) in bulk. Supports v7, ULID, and NanoID with 100% local processing.
100% Cryptographically Secure
Uses the browser's native crypto.getRandomValues() for true random entropy. No server calls, no predictable sequences.
Bulk Processing Engine
Optimized for high-speed generation of up to 1,000,000 IDs per batch. Perfect for database seeding and large-scale testing.
UUID Generator Use Cases
Frequently Asked Questions
Q. What is the difference between v4 and v7?
v4 is completely random, while v7 is time-ordered (sortable), making it better for database performance.
Q. Are these UUIDs truly unique?
Yes, the probability of a collision is so low that it is effectively zero for all practical purposes.
Q. Is my data safe?
Yes, all generation happens locally in your browser. No data is sent to our servers.
Q. What is a Nil UUID?
A special UUID consisting of all zeros (00000000-0000-0000-0000-000000000000).
Q. Can I generate UUIDs in bulk?
Yes, you can generate up to 10,000 UUIDs at once and download them as a list.
Q. What is UUID v4?
The most common version based on pure randomness. It's the standard choice for general compatibility across systems.
Q. What are the benefits of UUID v7?
It includes a timestamp, making it "sortable". This significantly improves database indexing performance compared to v4 and is highly recommended for new systems.
Q. How does ULID differ from UUID?
ULID (Universally Unique Lexicographically Sortable Identifier) uses 26 Base32 characters, making it more human-readable while remaining sortable and unique. It's a popular modern alternative.
Q. When should I use NanoID?
Use it when you need a short, secure, and URL-friendly ID. It's more compact than UUID and allows for customizable lengths, making it ideal for web and mobile apps.
Comparison by UUID Version
| Version | Method | Sortable | Best Usage |
|---|---|---|---|
| v1 | MAC Address & Time | Partial | Legacy Systems |
| v3 | MD5 Hash & Name | No | Deterministic IDs |
| v4 | Fully Random | No | General Purpose |
| v5 | SHA-1 Hash & Name | No | Deterministic IDs |
| v6 | Reordered v1 | Yes | DB Indexing |
| v7 | Unix Epoch Time | Yes | Modern Databases |
| v8 | Custom | Optional | Special Projects |
| Nil | Zeroed | No | Placeholder |
💡 UUID v7 is generally recommended for modern database primary keys due to its sortability.
Bulk Generation Performance
Testing browser-side generation speed (approximate).
| Count | v4 | v7 | ULID | NanoID |
|---|---|---|---|---|
| 1,000 | < 1 | < 1 | < 1 | < 1 |
| 10,000 | 2 | 3 | 2 | 1 |
| 50,000 | 10 | 15 | 12 | 5 |
| 100,000 | 25 | 35 | 30 | 12 |
| 500,000 | 150 | 200 | 180 | 70 |
*Performance may vary based on your browser and hardware specifications.
Key Features
- Supports v4 (Random) and v7 (Time-ordered)
- Bulk generation with one-click copy
- 100% local processing for privacy
- Clean, developer-friendly interface
Professional online uuid generator. Generate random uuid v4 or sortable uuid v7 identifiers in bulk uuid generator instantly.