UUID Generator
Instantly generate unique identifiers (UUID v4) right in your browser.
Unlimited, no registration, 100% free.
How to use the UUID Generator
Our UUID generator is designed for maximum speed and convenience. You don't need to install libraries or write scripts.
- Select quantity: Use the slider or input field to specify how many IDs you need (from 1 to 100 at a time).
- Customize format:
- UPPERCASE: Converts characters to uppercase (e.g. 4F3D...).
- No hyphens: Removes separators, creating a continuous 32-character string (useful for database keys).
- Generate: Click the 'Generate UUIDs' button. The results will appear instantly.
- Copy: Click the copy button next to a specific ID or use 'Copy All' to copy the entire list to the clipboard.
Privacy Note: Generation occurs entirely on your device (client-side) using the Web Crypto API. Your UUIDs are never sent to our servers.
Where are UUIDs/GUIDs used?
UUIDs (Universally Unique Identifiers) have become a standard in modern development. Here are the main use cases:
- Primary Keys in Databases: In distributed systems, using incremental IDs causes conflicts. UUIDs allow records to be created on different servers without synchronization.
- Session Tokens and API Keys: Due to their high entropy, UUIDs v4 are virtually impossible to guess by brute force, making them an excellent choice for temporary tokens.
- Names of Uploaded Files: To avoid overwriting files with the same name, developers rename them to [UUID].jpg when uploading.
- Idempotency Keys: In payment systems, UUIDs are used as idempotency keys, ensuring that a transaction is not processed twice when requested again.
Frequently Asked Questions
How unique is a v4 UUID?
The probability of a collision (match) is astronomically small. The total number of possible matches is 2^122. To achieve a 50% chance of a collision, you would need to generate 1 billion UUIDs per second for 85 years.
What is the difference between a GUID and a UUID?
Technically, they are the same thing. UUID is a standard term (RFC 4122). GUID (Globally Unique Identifier) is a term used by Microsoft. They are identical in structure and length (128 bits).
Is it safe to use UUIDs for passwords?
No. Although UUIDs are difficult to predict, they are not intended to be used as passwords. It's better to use a specialized password generator that includes special characters and has high entropy.