Free UUID Generator Online
Generate UUID v4 (random), v1 (timestamp), or v7 (Unix ms) GUIDs in bulk (up to 100 at once). Copy, download, or pick uppercase, no-hyphens, and bracket formats. 100% in your browser.
About UUIDs
- • UUID v4: Randomly generated via crypto.randomUUID when available. Most commonly used.
- • UUID v1: Generated using timestamp plus random clock/node bits. Sortable by creation time.
- • UUID v7: Unix millisecond timestamp plus random bits (RFC 9562). Time-ordered and suitable as modern database keys.
- • Format: Standard format is 8-4-4-4-12 hexadecimal digits (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)
- • Use cases: Database primary keys, session IDs, transaction IDs, unique filenames
Security note: UUIDs are not cryptographically secure. Don't use them for security tokens or passwords.
How to Use
- 1Select your preferred UUID version (v4 for random, v1 for timestamp, or v7 for Unix ms)
- 2Choose the output format (default, uppercase, no hyphens, or with brackets)
- 3Set the number of UUIDs you want to generate (1-100)
- 4Click 'Generate UUIDs' to create your unique identifiers
- 5Copy individual UUIDs or all at once using the copy buttons
- 6Download the UUIDs as a text file if needed
UUID Best Practices
- •Use UUID v4 for most general purposes - it's random and universally unique
- •Use UUID v1 or v7 when you need sortable, time-based identifiers
- •UUIDs make excellent database primary keys with no collision risk
- •Store UUIDs in binary format in databases to save space (16 bytes vs 36 characters)
- •Consider using UUIDs for distributed systems where auto-increment IDs won't work
- •UUIDs are case-insensitive - both uppercase and lowercase are valid
- •Never use UUIDs for security purposes or as secret tokens
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Frequently Asked Questions
What is a UUID generator?
A UUID generator creates Universally Unique Identifiers (also called GUIDs): 128-bit IDs used as database keys, session tokens, and distributed-system IDs. This free online tool generates UUID v4 (random), v1 (timestamp-based), or v7 (Unix ms) in your browser.
What's the difference between UUID v1, v4, and v7?
UUID v4 is fully random (crypto.randomUUID when available), best for privacy and general use. UUID v1 embeds a timestamp and is sortable by creation time. UUID v7 uses a Unix millisecond timestamp plus random bits (RFC 9562) and is preferred for modern time-ordered database keys.
Can I generate UUIDs in bulk?
Yes. Generate up to 100 UUIDs at once, then copy individually, copy all, or download as a .txt file. Supports default, uppercase, no-hyphens, and bracketed Microsoft GUID formats.
Are online UUID generators safe for production?
This tool uses JavaScript's crypto-quality randomness in your browser. Nothing is sent to a server. For security-sensitive tokens (API keys, passwords), use a dedicated secrets manager instead of UUIDs.
Can I use these UUIDs as database primary keys?
Absolutely. UUIDs are standard primary keys in PostgreSQL, MySQL, MongoDB, and distributed systems where auto-increment IDs would collide across nodes.