UUID Generator
Generate random UUID v4 values for apps, databases, and tests. Free, private, and local-first.
Use UUID Generator
Generate random UUID v4 values with browser crypto.
2f0ec1f2-8d2f-4d74-b5f5-6e3fc0f9c1a19f3a1d0a-0d57-48a9-9f51-0e8f0b9a2a227e1f1c6e-6f7f-49de-b23a-4a5f1e14b833b83f35e2-dfb6-41b4-82b9-3fd0f0f6d345c452f01a-50b9-477e-a79a-16d61f8f1d2c
UUIDs are generated locally with the browser Crypto API.
Quick answer
UUID Generator is a free online tool that helps you generate random UUID v4 values for apps, databases, and tests. It runs in your browser, so you can work with development data, text, files, or generated output without creating an account.
About UUID Generator
UUID Generator helps you generate random UUID v4 values for apps, databases, and tests. It is designed for focused local-first workflows where you need a quick result without creating an account or sending your input to a server.
Common uses include generating primary keys for database seed records, creating unique identifiers for api resources, adding stable ids to json mock data.
Use the examples, usage notes, FAQ, and related tools below when you need to compare formats, build sample data, validate inputs, or move into the next step of the same workflow.
What this tool does
How to use UUID Generator
- 1
Choose how many UUIDs you need for your workflow.
- 2
Click Generate to create new random UUID v4 values.
- 3
Toggle uppercase or lowercase if your system has a preferred style.
- 4
Copy the generated IDs into your database, mock JSON, tests, or code.
Examples
UUID v4
550e8400-e29b-41d4-a716-446655440000
Database ID
customer_id: 7d8e9b6a-4f21-4b28-90da-77d8e5b73b21
Mock JSON
{"id":"f47ac10b-58cc-4372-a567-0e02b2c3d479"}
Bulk
Generate 10, 25, or 50 UUIDs at once
Use cases
- Generating primary keys for database seed records
- Creating unique identifiers for API resources
- Adding stable IDs to JSON mock data
- Naming files, exports, or assets with unique suffixes
- Testing form fields that require UUID input
- Creating trace IDs for development logs
Related workflow
After using UUID Generator, many workflows continue with related tools for validation, conversion, cleanup, mock data, or final export.
Privacy and usage notes
CodeVella tools are designed to run locally in your browser. Your input is not uploaded to a server, and no account is required.
Generated test data is intended for development, QA, demos, and safe internal workflows.
Frequently asked questions
Is my data uploaded?+
No. This tool is designed to run locally in your browser.
Do I need an account?+
No signup is required for CodeVella tools.
What is a UUID v4 used for?+
A UUID v4 is commonly used as a unique identifier for database records, API resources, test fixtures, file names, and distributed systems where sequential IDs are not ideal.
Are UUIDs guaranteed to be unique?+
UUID v4 values are random and have an extremely low collision probability, but no random ID can be mathematically guaranteed unique across every system forever. Databases should still enforce uniqueness where it matters.
Should I use UUIDs as passwords or secrets?+
No. UUIDs are identifiers, not passwords. Use the Password Generator for secrets and credentials that need strong entropy and configurable length.