UUID Generator (v4, v7, v1, v3, v5, NIL)
Generate UUIDs across multiple versions (v4 Random, v7 Timestamp-ordered, v1, v3, v5, NIL). Custom formatting & bulk export.
Select UUID Version
UUID Formatting & Batch Options
How do I use UUID Generator?
Select your target UUID version (v4 Random, v7 Time-ordered, v1, v3, v5, or NIL).
Specify quantity (1 to 100) and custom formatting (Uppercase, Hyphens, Braces).
Click 'Generate UUIDs' to create fresh unique identifiers.
Copy individual UUIDs or download the full batch as TXT or JSON.
What features does UUID Generator offer?
Multi-Version Support: Generates UUID v4, v7 (Unix Epoch time-ordered), v1, v3, v5, and NIL.
UUID v7 Database Standard: Optimized for modern database primary keys with time sorting.
Bulk Generation: Create up to 100 UUIDs per batch instantly.
Custom Formatting: Uppercase, hyphenated, and braced output toggles.
Frequently Asked Questions about UUID Generator
Why should I use UUID v7 instead of UUID v4?
UUID v7 embeds a 48-bit Unix timestamp at the beginning of the ID, making UUIDs naturally time-ordered. This vastly improves database indexing performance (B-Tree page splits) compared to random UUID v4.
Are these UUIDs generated securely in browser?
Yes. All UUIDs are generated 100% client-side using Web Crypto API randomness — no network requests are made.
Which UUID version should I use for database primary keys?
Use UUID v7 for modern databases (PostgreSQL 17+, MySQL 8+). The time-ordered prefix means IDs sort chronologically, which dramatically reduces B-Tree page splits and index fragmentation compared to random UUID v4. Use v4 only if you don't need time ordering.
Explore Related Developer Tools
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to text. Supports Unicode UTF-8 and URL-Safe modes.
Password Generator
Generate strong random passwords with custom length, character sets, and bit entropy meter.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hash digests from text or files.
