Test File Generator
Format
Lorem-style sentences, one per line.
Target size
Max 50 MB
The file is built and downloaded entirely in your browser with the Web Crypto API — nothing is uploaded. The download is exactly the byte size you pick; large files repeat fixture rows to fill the space.
Dummy files for testing
Generate a real, downloadable file of a chosen format and size for testing without hunting for a sample. Use it to exercise upload flows and file-size validation, probe storage and quota limits, benchmark bandwidth and download speed, or hand your parser a fixture in CSV, JSON, JSON Lines, XML, log, or raw binary form.
Pick a preset from 1 KB to 10 MB, or type a custom size in KB or MB up to 50 MB. Structured formats reuse the same fixture rows as the CSV, JSON, and XML generators, so the content looks realistic while staying safe to share.