UUID Generator
Generate one or many unique identifiers
Click Generate to create UUIDs
What this tool does
UUID Generator creates universally unique identifiers (UUIDs) — 128-bit values commonly used as database keys, request IDs, or unique names for files and records. Everything is generated locally in your browser using its cryptographically secure random number generator.
How it works
- Version — v4 is fully random and the most common choice. v7 embeds the current timestamp, so IDs generated later sort after earlier ones, which is useful for database keys. Nil UUID produces the all-zero placeholder value used to represent "no ID."
- Count — how many to generate at once, up to 200.
- Uppercase / No hyphens — formatting options for the output, useful when a target system expects a specific style.
- Generate — creates a fresh batch, replacing whatever was there before.
- Copy Output — copy a single UUID with the button next to it, or grab the whole batch at once with Copy All.
Good to know
- v4 UUIDs are random enough that collisions are effectively impossible in practice — you don't need to check for duplicates.
- v7 UUIDs reveal the approximate creation time to anyone who reads them; avoid v7 if the ID shouldn't leak a timestamp.
- These are generated for general-purpose use, not as cryptographic secrets like passwords or API keys.