Create test files from the command line

Copy-paste commands to make test files on 🪟 Windows, 🍎 macOS and 🐧 Linux — a large file of an exact size, random data, N lines, a CSV, thousands of files at once, unique content per file, and how to generate & verify checksums. Hit Explain on any command to see what each part does. No install needed for our on-demand generator.