UUID Generator
DevelopmentUUID v4, v7, ULID, Nano ID
- Runs in your browser
- Nothing is sent to a server
- No sign-up
Identifier Type
(max. 100)
Format comparison
| Format | Length | Sortable | Ideal use |
|---|---|---|---|
| UUID v4 | 36 chars | No | General identifiers |
| UUID v7 | 36 chars | Yes | DB with B-tree indexes |
| ULID | 26 chars | Yes | Compact alt. to UUID v7 |
| Nano ID | 21 chars | No | URLs, slugs, tokens |
UUID Generator: v1, v4, v5 and v7 in a Single Click
UUIDs (Universally Unique Identifiers) are 128-bit strings guaranteed to be unique in the world without central coordination. Standard for record IDs in databases, tokens, event IDs, and any case requiring a unique ID without collision.
Our generator supports the most useful variants: UUIDv4 (random, most common), UUIDv1 (time + MAC), UUIDv5 (deterministic from name + namespace), and UUIDv7 (time-ordered, ideal for DBs). Generate individually or in bulk (up to 1000).
For architects designing distributed systems, developers choosing UUIDs for their applications, or DBAs migrating from auto-increment. Instant generation, no server.
How does it work?
- Select UUID version
v4 for general use (random), v7 for DBs (sortable), v5 for deterministic IDs (from name).
- Choose quantity
Generate 1, 10, 100, or up to 1000 UUIDs at once. Useful for seeding data.
- Copy the results
Copy individual UUID or the entire list. Available in different formats (with hyphens, without, uppercase).
Frequently Asked Questions
Which UUID version should I use in 2026?
For new DBs: UUIDv7 (2024 standard, sortable by time, more efficient in B-tree indexes). For general use: UUIDv4 (random, no leaks). For deterministic IDs (same input, same UUID): UUIDv5.
How many UUIDv4 can I generate before collision?
UUIDv4 has 122 random bits (128 - 6 for version and variant). Probability of collision after generating N UUIDs = N²/(2 × 2^122). To have 50% probability of collision, you'd need to generate 2.71 × 10^18 UUIDs. Practically zero risk.
Is it safe to use UUIDs as security tokens?
UUIDv4 has 122 bits of entropy — sufficient security if generated with crypto.getRandomValues(). BUT: some implementations use Math.random() which is not cryptographic. Always verify your library uses secure random. Ours uses Web Crypto API.