UUID & GUID Generator - Technical Reference
Universally Unique Identifiers (UUIDs) are essential in modern software architecture, used to identify information without a significant central coordination. Our tool provides instant, high-entropy UUIDs (specifically Version 4) directly in your browser.
The Science Behind UUID v4
A Version 4 UUID is generated using random numbers. The probability of a collision (two identical UUIDs being generated) is astronomically low. To put it in perspective, if you generated 1 billion UUIDs every second for the next 100 years, the chance of creating a duplicate would still be less than 50%. Our generator uses the **Web Crypto API** to ensure that the "randomness" is cryptographically strong, making it suitable for database keys, session IDs, and transaction identifiers.
Primary Use Cases
- Database Primary Keys: Using UUIDs instead of auto-incrementing integers prevents attackers from guessing the total number of records or discovering next IDs through "ID crawling."
- Distributed Systems: Since UUIDs are unique across space and time, different systems can generate IDs independently without checking a central database, preventing bottlenecks.
- Safe File Naming: Use a UUID to name uploaded files to ensure they never overwrite existing files with similar names.
Why our tool is safer
Many "bulk UUID generators" collect your generated IDs on their servers. While a UUID itself isn't private, knowing what IDs a system is using can be a vital piece of information for a security exploit. **QuickTools does not store your generated IDs.** Once you generate them, they exist only in your browser window.
Frequently Asked Questions
Are these UUIDs truly unique?
Yes. While there is a theoretical possibility of collision, the total number of unique keys (2^122) is
so
large that the probability of generating a duplicate is virtually zero.
Can I use them for database keys?
Absolutely. UUIDs are widely used as primary keys in modern distributed databases like PostgreSQL,
MongoDB, and Cassandra.