UUID Generator
Generate cryptographically random UUIDs (v4) instantly. Create one or bulk-generate up to 100 at a time, then copy them with one click.
Click any UUID to copy it.
How to use UUID Generator.
- 1
Choose how many UUIDs you need (1 to 100)
- 2
Click 'Generate' — the UUIDs appear instantly in the output list
- 3
Toggle uppercase if your system expects capital hex digits
- 4
Click 'Copy All' to copy the whole list, or click any single UUID to copy just that one
Why use this tool.
Generate database primary keys, request IDs, and test fixtures in seconds
Cryptographically secure — uses the browser's crypto API, not Math.random()
Bulk mode fills spreadsheets and seed files without a script
Nothing is generated on or logged by a server — IDs are yours alone
No signup, no rate limits, completely free
About UUID Generator.
True Tool Deck's UUID Generator creates version 4 UUIDs — the random, cryptographically secure identifiers used everywhere in modern software: database primary keys, API request tracing, session tokens, file names, and test data. Generate a single UUID or up to 100 at once for seeding spreadsheets and fixtures, toggle between lowercase and uppercase formats, and copy individual IDs or the entire batch with one click. Generation uses your browser's secure crypto API, so the identifiers are statistically guaranteed unique and never touch a server — nothing is logged, stored, or transmitted. Free, unlimited, and instant.
Frequently asked questions.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier written as 36 characters — for example 550e8400-e29b-41d4-a716-446655440000. UUIDs can be generated anywhere without coordination and are effectively guaranteed to be unique across systems.
What UUID version does this tool generate?
Version 4 — the random variant. 122 of the 128 bits are filled with cryptographically secure random data, which is the most widely used UUID type for database keys, API request IDs, and distributed systems.
Can two generated UUIDs ever collide?
The probability is astronomically small. You would need to generate about 2.7 quintillion UUIDs to have even a 50% chance of a single collision. For practical purposes, v4 UUIDs are unique.
Is this generator cryptographically secure?
Yes. It uses the browser's built-in crypto.randomUUID() / crypto.getRandomValues() API, which draws from the operating system's secure random source — not the predictable Math.random().
Are GUID and UUID the same thing?
Yes. GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit format. A GUID generated on Windows and a UUID generated here are interchangeable.
Should I use UUIDs as database primary keys?
UUIDs are excellent when you need IDs generated by multiple services or before a database insert. They are larger than integer keys and random ordering can fragment indexes, so high-write tables sometimes prefer sequential variants like UUIDv7 — but for most applications, v4 works well.