UUID Generator — Generate UUIDs of Any Version
Instantly generate universally unique identifiers (UUIDs) for your apps, APIs, databases, or testing environments. Customize version, remove hyphens, and export with ease.
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What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information across systems without central coordination. It's widely used in databases, REST APIs, microservices, and authentication systems.
UUID Versions Explained
Each version of UUID has a different purpose and generation method:
- v1: Time-based, includes timestamp and MAC address
- v3: Deterministic, using MD5 hash of name + namespace
- v4: Fully random (most popular)
- v5: Deterministic, using SHA-1 of name + namespace
- v6, v7, v8: Experimental formats for sorting and custom layout
UUID Version Comparison Table
| UUID Version | Purpose | Deterministic | RFC | Namespace Required |
|---|---|---|---|---|
v1 | Time-based using MAC | No | 4122 | No |
v3 | MD5 of name + namespace | Yes | 4122 | Yes |
v4 | Random UUID | No | 4122 | No |
v5 | SHA-1 of name + namespace | Yes | 4122 | Yes |
v6 | Time-ordered (experimental) | No | draft | No |
v7 | Unix timestamp + randomness | No | draft | No |
v8 | Custom format | Optional | draft | Optional |
Key Features
- Supports UUID v1–v5 and placeholder v6–v8
- Bulk generation: 1–1000 UUIDs at once
- Name/namespace support for deterministic UUIDs
- Hyphen toggle for compact output
- Copy/export in TXT or CSV format
Use Cases
- Assigning IDs in distributed databases
- Simulating unique payloads in API testing
- Creating tokens, trace IDs, or license keys
- Generating reproducible IDs using v3/v5
Are UUIDs Secure?
UUID v4 provides high randomness and is suitable for most security use cases. v1 is predictable, while v3/v5 are deterministic. All UUIDs are generated locally in your browser.
What Are UUID v6, v7, and v8?
These are newer UUID versions proposed for specialized needs:
- v6: Improved sorting with time-first layout
- v7: Based on Unix timestamp in milliseconds
- v8: Reserved for custom binary layouts
Frequently Asked Questions (FAQs)
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