Runs in your browser · nothing is uploaded
Custom file generator
Need a size or row count we don’t host? Make it here. Files are built on your device and saved directly, so even multi-gigabyte files work.
How it works
Byte-sized files are exact: choose 10 MB (binary) and you get 10,485,760 bytes. Text files are cut at an exact byte count too, ending with a newline. Row-based files contain exactly the number of records you ask for.
In Chrome and Edge the file streams straight to disk, so size is limited only by free space. Other browsers build it in memory first, so keep those to a few hundred megabytes. Everything here is free to use under CC0.