UUID Generator — Random v4 & Time-Ordered v7 GUIDs Online
Generate universally unique identifiers instantly with this free online UUID generator. Create a single UUID or up to 1,000 in one click, choosing between random UUID v4 — the everyday standard for IDs — and time-ordered UUID v7, the modern choice for database primary keys because it keeps indexes efficient by sorting chronologically.
Every identifier is produced with cryptographically secure randomness in your browser, so IDs are unpredictable and never transmitted anywhere. Bulk output comes with copy-all and .txt export, making it easy to seed databases, generate test fixtures, or fill spreadsheets with unique keys.
How to Generate UUIDs in Bulk
-
Pick the version
Choose UUID v4 for pure random identifiers or UUID v7 for time-ordered, database-friendly keys.
-
Set the quantity
Generate one UUID or up to 1,000 at once for bulk seeding and testing.
-
Generate
IDs are created instantly using the browser's secure random source.
-
Copy or export
Copy a single UUID, copy the whole list, or download everything as a .txt file.
Why Use This UUID / GUID Generator?
-
UUID v4 and v7
Random v4 for general use; monotonic, timestamp-prefixed v7 for primary keys and sortable IDs.
-
Bulk generation up to 1,000
Fill test databases and spreadsheets in one click instead of running scripts.
-
Cryptographically secure
Randomness comes from the Web Crypto API, so identifiers are unpredictable and collision-resistant.
-
Copy-all and .txt export
Grab the entire batch to clipboard or download it as a plain text file.
-
RFC 9562 compliant
Output follows the current UUID standard, valid in every language, database, and framework.
Frequently Asked Questions
What is the difference between UUID v4 and v7?
UUID v4 is 122 bits of pure randomness. UUID v7 starts with a millisecond timestamp followed by random bits, so IDs sort by creation time — which dramatically improves B-tree index locality when used as database primary keys.
Are UUID and GUID the same thing?
Yes. GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit identifier format standardized as UUID. They are interchangeable.
Can two generated UUIDs collide?
The probability is astronomically small — you would need to generate about 2.7 quintillion v4 UUIDs to reach even a 50% chance of one collision. For practical purposes, UUIDs are unique.
Should I use UUID v4 or v7 for my database primary key?
Prefer v7. Its time-ordered prefix keeps newly inserted rows adjacent in the index, avoiding the page-split churn and cache misses that random v4 keys cause at scale.
Is it safe to generate UUIDs in the browser?
Yes — this tool uses crypto.getRandomValues(), the same secure randomness backing crypto.randomUUID(), and generated IDs never leave your device.