UUID Generator for Random UUID v4 & GUIDs
Generate random UUID v4 identifiers for database rows, request IDs, test data, and distributed systems directly in your browser.
A UUID v4 generator creates random 128-bit identifiers in the standard UUID format.
Use UUIDs for identifiers and test data, not for passwords, API keys, or access tokens.
Choose the right format
Standard hyphenated UUIDs are easiest to read, while no-hyphen values fit compact systems.
Generate only what you need
Bulk output is convenient for fixtures, but production IDs should usually be generated by the application.
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
The `4` marks version 4. The `y` position is one of 8, 9, A, or B in standard UUID v4 output.
UUIDs are useful for client-generated records, imports, fixtures, request tracing, temporary IDs, and distributed workflows where a central counter is inconvenient.
This tool is for identifiers, not passwords, secrets, API keys, or authentication tokens.
Format Assumption
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
The version position is fixed to 4. The variant position is one of 8, 9, A, or B.
Example use
Generate 20 UUIDs for test fixtures, import rows, local draft IDs, or request correlation examples.
Limitation
UUIDs are useful identifiers, but they should not be treated as passwords, API keys, or unguessable access tokens.
Test fixtures
Generate IDs for sample rows, mock records, and local seed data.
Import rows
Create temporary identifiers for spreadsheet or CSV import examples.
Request tracing
Use UUID-shaped values in docs and debugging examples for correlation IDs.
Draft objects
Assign local IDs to prototypes, demos, and client-side examples.
Are UUID v4 values guaranteed unique?
No random identifier can be mathematically guaranteed unique, but UUID v4 has such a large random space that collisions are extremely unlikely for normal application use.
Can I use UUIDs as database primary keys?
Yes, UUIDs are commonly used as database identifiers. Some databases also offer ordered UUID-style IDs when index locality matters.
Are UUIDs secure tokens?
No. UUIDs are identifiers, not authentication secrets. Do not use them as passwords, session tokens, or API keys.
Does this tool send generated UUIDs anywhere?
No. The generator runs locally in your browser and does not need a backend or external API.
Suggested workflow
Identifier generation path
Move from random IDs to scannable labels or fingerprints depending on how the identifier will be used.