Free Online UUID Generator
Generate UUID v1, v4, or v7 (GUID) online — up to 10,000 at once. Export as TXT or CSV. 100% client-side, free, no signup required.
100% Client-Side · Your data never leaves your browserHow to Use UUID Generator
Choose a UUID version based on your use case:
- v4 (Random) — the safe default for most applications. Cryptographically random.
- v4 (Native) — uses
crypto.randomUUID()built into the browser for maximum performance. - v1 (Time-based) — encodes the timestamp and a MAC address fragment. Avoid in privacy-sensitive contexts.
- v7 (Time-ordered) — recommended for database primary keys. Lexicographically sortable by creation time.
Adjust the count slider to generate up to 10,000 UUIDs at once. Use Copy All or download as TXT/CSV.
Keyboard shortcut: Ctrl/Cmd+Enter to generate, Ctrl/Cmd+K to clear.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID (Globally Unique Identifier), is a 128-bit identifier formatted as 8-4-4-4-12 hexadecimal characters. UUIDs are used to uniquely identify records, sessions, files, or resources without a central authority.
What is the difference between UUID v1, v4, and v7?
v1 encodes the current timestamp and a node identifier (usually a MAC address fragment), making it unique but potentially leaking timing or host information. v4 is completely random and is the most widely used. v7 is time-ordered and random, making it ideal for use as a database primary key since it can be sorted chronologically.
Is it safe to use crypto.randomUUID() in production?
Yes. crypto.randomUUID() uses the browser's cryptographically secure random number generator — the same source as v4 UUIDs. It's available in all modern browsers and Node.js 14.17+.
How unique is a UUID v4?
UUID v4 has 122 bits of randomness, giving 2¹²² ≈ 5.3 × 10³⁶ possible values. The probability of generating two identical UUIDs is negligibly small — you would need to generate billions of UUIDs per second for many years before a collision became likely.
Can I generate UUIDs in bulk?
Yes! Use the slider or number input to set the count (up to 10,000), then click Generate. You can copy all UUIDs to clipboard or download as a .txt or .csv file.