UUID Generator
Generate UUIDs in multiple versions (v1, v3, v4, v5)
Generates random UUID using cryptographic random numbers.
About UUID Generator
Generate UUIDs (Universally Unique Identifiers) in different versions. Each UUID is a 128-bit value guaranteed to be unique across space and time.
How to Use
- Select a UUID version using the version buttons above
- For v3/v5: Enter a namespace UUID and name to generate deterministic UUIDs
- Set the count to generate multiple UUIDs at once
- Choose a display format (Standard, Uppercase, or No Hyphens)
- Click "Regenerate" to create new UUIDs
- Use the Copy button to copy individual UUIDs to clipboard
About UUID Generator
Generate UUIDs in multiple versions (v1, v3, v4, v5)
How to Use
Use this tool to generate uuids in multiple versions (v1, v3, v4, v5). Simply input your data and get instant results.
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Frequently Asked Questions
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier generated to be unique across space and time. It is commonly used in software development for creating unique IDs for database records, sessions, and other resources.
What UUID versions are supported?
This tool supports v1 (time-based), v3 (MD5 name-based), v4 (random), and v5 (SHA-1 name-based) UUIDs. Each version has different use cases and generation methods.
Which UUID version should I use?
Use v4 for most cases - it generates random UUIDs with extremely low collision probability. Use v1 for time-ordered UUIDs. Use v3/v5 when you need deterministic UUIDs generated from the same namespace and name.
Are UUIDs guaranteed to be unique?
While UUIDs are designed to be unique, they are not mathematically guaranteed. However, the probability of generating duplicate UUIDs is extremely low (practically impossible in normal usage).
Can I use UUIDs as primary keys?
Yes, UUIDs are commonly used as primary keys in databases, especially in distributed systems. They avoid key collisions when merging data from different sources.
How many UUIDs can I generate?
You can generate as many UUIDs as needed. Each generation is instant and independent. UUIDs are stateless and do not require coordination between generations.
What are namespace and name in v3/v5 UUIDs?
For name-based UUIDs (v3/v5), you provide a namespace UUID (like DNS, URL, OID, or X500) and a name. The same namespace + name combination will always generate the same UUID, making them deterministic.