Observed arrival · 2026-08-20
FileMill, the test-file factory for upload edge cases
A Mac utility that generates valid or deliberately corrupted files in 153 formats at exact byte sizes for developer and QA testing.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
Why it surfaced
FileMill targets the neglected corners of upload testing: files one byte under, at, and over a limit; mangled headers; suspicious filenames; and formats such as WOFF2, SQLite, torrents, certificates, and 3D models. Its browser demo runs without uploading anything, while the Mac app offers a 14-day trial and a €12 one-time purchase.
A Mac utility that generates valid or deliberately corrupted files in 153 formats at exact byte sizes for developer and QA testing.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue