UUID Generator
Generate cryptographically random UUID v4 identifiers. Bulk generation up to 100, with uppercase and dash-removal options — entirely in your browser.
Options
UUID v4
- 1e706b55-3b73-40ed-9c79-cce87241b1c1
UUIDs are generated using
crypto.randomUUID() — cryptographically random, entirely in your browser, never sent to any server.How it works
- Set the count (1–100), toggle uppercase or no-dashes formatting to your preference.
- Click Generate to produce a fresh batch of UUID v4s using
crypto.randomUUID(). - Copy individual UUIDs with their row copy button, or use the "Copy all" button to get every UUID separated by newlines.
Frequently asked questions
- What is a UUID?
- A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. The version 4 variant (UUID v4) is randomly generated, making the probability of collision astronomically small.
- How random are these UUIDs?
- Very. UUID v4s are generated using crypto.randomUUID(), which is backed by the Web Cryptography API — the same cryptographically strong random number generator used for encryption keys. The chance of two matching UUIDs is roughly 1 in 5 undecillion.
- What is the difference between UUID and GUID?
- Nothing significant. GUID (Globally Unique Identifier) is Microsoft's term for the same concept. They follow the same RFC 4122 standard and are interchangeable in practice.
- When should I remove dashes?
- Some databases, APIs, or programming languages expect UUIDs without hyphens (e.g., 32-character hex strings). The 'Remove dashes' toggle strips all four hyphens from the standard 36-character format.
- Can I generate more than 100 at once?
- The maximum is 100 per generation. For bulk generation of thousands of UUIDs, you could run this multiple times or use a command-line tool like uuidgen.