About UUID Generator
Generates UUIDs — v4 (random) or v1 (timestamp-based) — in whatever quantity you need, up to 10,000 at a time. It all happens in the browser, so your identifiers are generated locally and never sent anywhere.
You probably know when you need one: a primary key, an API resource ID, a session token, test fixtures. The details this tool handles are the boring but useful ones — uppercase output if your database or system prefers it, and stripping the hyphens for a compact 32-character format.
One thing worth knowing if you pick v1: it embeds the timestamp (and the generating machine's MAC address), so values come out roughly time-ordered — but they also leak when and where they were made. v4 is random and is the safe default for almost everything.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label formatted as 36 characters (32 hexadecimal digits with four hyphens), for example 550e8400-e29b-41d4-a716-446655440000. UUIDs are used to identify records, entities and resources without a central registry.
What is the difference between UUID v1 and v4?
UUID v4 is generated from random numbers and is the most common choice for database primary keys and API IDs. UUID v1 embeds the current timestamp and the generating node's MAC address, so it is roughly time-ordered but reveals when and where it was created.
Can I generate many UUIDs at once?
Yes. Set the count up to 10,000 and click "Generate UUIDs" to create them in bulk — handy when you're seeding test data, fixtures or migration scripts. Copy all or download them as a .txt file.
Can I remove hyphens or use uppercase letters?
Yes. Enable "Uppercase letters" to get A-F uppercase hex digits, or "Remove hyphens" for a compact 32-character format often required by databases, file names and legacy systems.
Are generated UUIDs private?
Yes. Generation happens entirely in your browser with the standard uuid library. Your UUIDs are never sent to any server, so they are safe to use as tokens, keys and identifiers.