UUID Generator (v4, v7, Nil)
Generate cryptographically-strong UUIDs in bulk. Supports v4 (random), v7 (time-ordered), and the nil UUID. Formatting options included.
Runs 100% in your browser — nothing is uploaded.
Frequently asked
What is the difference between v4 and v7?
v4 UUIDs are entirely random and unordered — great for uniqueness, terrible for database indexing. v7 UUIDs prepend a millisecond timestamp so they sort chronologically, making them much better as primary keys.
Are these UUIDs cryptographically random?
Yes. We use the browser Web Crypto API (crypto.randomUUID and crypto.getRandomValues) — the same source of randomness used for HTTPS handshakes.
Can I generate more than 100 at once?
The UI caps at 100 to keep the page snappy. If you need thousands, wire the same logic into your own script or hit the (upcoming) API.
Related tools
- Hash GeneratorInstantly compute MD5 and SHA-family hashes of any text. All hashing happens in
- JWT DecoderPaste any JSON Web Token (JWT) to see the decoded header, payload, and expiratio
- Base ConverterConvert numbers between binary, octal, decimal, and hexadecimal. Supports huge n
- Cron BuilderPick a preset or enter your own fields to build a cron expression. Includes a pl
- CSS Beautifier & MinifierBeautify minified CSS with proper indentation, or minify pretty CSS to a single
- HTML Beautifier & MinifierBeautify minified HTML with proper indentation, or minify pretty HTML for produc