When 10MB is the number you actually need
A 10 MB cap usually comes from a specific form or platform, not a video-quality choice, so check the limit stated by whatever you are uploading to rather than assuming it. Some services publish a fixed cap; others vary by account type or have changed their limit over time, so the number worth trusting is the one shown at the point of upload.
What changes at this target
Hitting 10 MB usually means a noticeably lower bitrate than a 25 MB or 50 MB target on the same clip, since there is less room to work with. A short clip, a few seconds to well under a minute, keeps more visible detail at 10 MB than a multi-minute recording of the same resolution. If the source is long, trimming it before compressing gets closer to the target without pushing the bitrate as low.
How QuickCompress handles it
Type 10 (or your exact number, in MB) into the target-size field and QuickCompress calculates the bitrate needed to reach it, then encodes locally using Apple Silicon hardware acceleration. The original file is left untouched; the compressed copy is a separate output.
Supported files
QuickCompress accepts MP4 and MOV input and always outputs a compressed MP4. Compression runs on your Mac, videos are not uploaded to QuickCompress servers to be processed, though the app still needs an internet connection for initial license activation and for checking updates.
Measured result
In the target-size accuracy test, a real 2-minute animated clip given a 12 MB custom target landed at 11.47 MB, 95.6% of that target, in a single attempt. That is the closest published result to a 10 MB target and shows how tightly QuickCompress can hit a small custom number on a short clip.