Mock users and rows in JSON, CSV & SQL.
Custom QR codes as PNG or SVG.
Built with privacy in mind. All processing happens entirely in your browser using open-source libraries.
A random generator creates values that have no predictable pattern: whole numbers inside a range, RFC 4122 version 4 UUIDs, or classic Lorem Ipsum placeholder text. You choose the type, the quantity and, for numbers, the minimum and maximum - the tool does the rest.
When the Unique option is on, the tool shuffles the whole interval with a Fisher-Yates shuffle and takes the requested slice, so every value appears exactly once and duplicates are impossible - even for 10,000 numbers at once. UUIDs are produced from the browser’s cryptographic random source, and text output is fully UTF-8 safe, so Turkish, Arabic and Chinese characters survive copy and CSV download.
Yes, free with no signup or limits.
The interval holds at most Max - Min + 1 unique values. Asking for more than that is impossible, and the tool tells you the real limit in red.
Yes. Files are exported with UTF-8 encoding, so characters such as ş, ğ, ə, Arabic and Chinese text stay intact.