A middle-ground target
A 50 MB cap generally leaves more room than a strict email limit, which usually means less visible compression on the same source. Exact limits vary by app and account type and do change over time, so treat 50 MB as a reasonable target rather than a specific platform's permanent number.
What to expect at this target
50 MB gives the encoder roughly double the bitrate budget of a 25 MB target on the same clip, which is why the tested animated and live-action clips both reached it more comfortably than their 25 MB targets (see the measured results below). Long recordings or native 4K footage still need a much lower bitrate to fit 50 MB, the same tradeoff that shows up at 25 MB, just less severe.
How QuickCompress handles it
Type 50 into the target-size field and QuickCompress calculates the bitrate to land at or under that number, encoding locally on Apple Silicon hardware. The source file is never modified; you always get a new, separate compressed file back.
Formats and where processing happens
MP4 and MOV are the supported inputs, and the output is always a compressed MP4. Compression runs entirely on your Mac rather than through a cloud upload, with the app still needing an internet connection to activate your license the first time and to check for updates.
Measured result
In the target-size accuracy test, a real animated clip hit 45.40 MB against a 50 MB target (90.8% of target), and a separate live-action clip hit 45.56 MB (91.1% of target), both in one attempt. The same test series showed a much larger native-4K source could not reach 50 MB, landing at 76.96 MB after four attempts, underlining how much source resolution and length affect what a given target actually costs in quality.