UUID Generator
Generate random version-4 UUIDs (GUIDs) one at a time or in bulk, with optional uppercase and no-dashes formats.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
Are values from this uuid generator secure and random?+
Yes β they're generated locally in your browser, using the cryptographically secure Web Crypto API where appropriate. Nothing is logged or transmitted.
Is my data private?+
Yes. The tool runs entirely in your browser β nothing you paste or type is uploaded to a server.
Guides & deep dives
UUIDs Explained: v4 vs v7 and When to Use Them
Learn the collision math behind UUIDs, when to pick v4 vs v7 for database keys, what GUID means, and when UUIDs are the wrong tool entirely.
CSV to JSON: Handling Headers, Quotes and Nested Data
Master CSV to JSON conversion: RFC 4180 quoting rules, delimiter problems, type inference, and flattening nested JSON back to CSV β with worked examples.
What Makes a Password Strong in 2026
Learn what actually makes a password uncrackable in 2026: entropy math, why length beats complexity, passphrases, and how modern crackers work.