Generators
UUID Generator
Generate unique identifiers for your projects.
Enter the values and review the result.
Calculation assumptions
- *This tool generates UUID version 4 identifiers.
- *UUIDs are identifiers, not passwords, secrets, or access tokens.
- *Collision risk is low for normal identifier use, but database constraints are still important.
- *Use purpose-built security tokens for authentication or authorization workflows.
Choose your options and press Generate UUID.
Your generated output will appear here.
What this UUID generator does
A UUID is a 128-bit identifier often used for records, test data, request IDs, and application objects.
Example: generate a UUID for a temporary database row, mock API object, or test fixture where a unique-looking identifier is useful.
UUIDs help identify things, but they should not be treated as passwords or secret tokens. For adjacent utilities, browse the Developer Tools category.
Common mistakes
- Using UUIDs as secrets or passwords.
- Skipping database uniqueness constraints because collisions are unlikely.
- Assuming UUIDs are ordered by creation time.
- Changing the format and breaking systems that expect standard UUID strings.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
Results depend on the values you enter and any simplified assumptions used by the tool. Verify important results before making decisions or submitting official information.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Select the UUID version (currently supporting v4).
Click calculate to generate a new unique identifier.
Copy the UUID for use in your database or application.
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Related Guides
Background reading and explanations related to UUID Generator.
Frequently Asked Questions
Common questions about UUID Generator and how to read the result.
Are UUIDs really unique?
They are not mathematically guaranteed to be unique, but collision risk is low for normal identifier use. Keep database uniqueness checks where they matter.
What UUID version does this create?
It creates version 4 UUIDs.
Can I use a UUID as a password?
No. UUIDs are identifiers, not passwords or security secrets.
Should my database still enforce uniqueness?
Yes. UUID collision risk is low, but database constraints are still the safer design.
Are UUIDs good for URLs?
They can be used in URLs when your application accepts long identifier strings.
Do UUIDs include personal data?
Version 4 UUIDs generated here are random identifiers and do not intentionally include personal data.