Where a 100MB limit shows up
This size fits situations a tighter limit does not: a several-minute screen recording, a longer clip meant for a course or shared-drive upload cap, or 4K footage where a smaller target would need too much quality loss to be worth it. As with the smaller targets, check the specific limit for wherever the file is going rather than assuming 100 MB is universal.
What to expect at this target
Native 4K sources are the real test case for this target: they need a much larger file to preserve detail than a typical clip does. The measured result below shows exactly what that meant for one tested native-4K source.
How QuickCompress handles it
Enter 100 into the target-size field and QuickCompress works out the bitrate to land at or under that size, encoding locally using Apple Silicon hardware acceleration regardless of how long the source runs. Your original file is left in place; the compressed copy is a separate output.
Formats and where processing happens
MP4 and MOV in, compressed MP4 out. Compression happens on your Mac, not through an upload to a server, though QuickCompress still needs the internet the first time you activate your license and when it checks for updates.
Measured result
A real 1.96 GB native-4K source clip could not reach a 25 MB or 50 MB target in testing, but hit 92.14 MB against a 100 MB target in a single attempt: 92.1% of that target. For this tested source, 100 MB was the first of the tested 25 MB, 50 MB, and 100 MB targets it successfully reached.