A 100 MB cap is typical for WordPress hosts, learning-management systems and messaging apps that allow larger files but still reject raw camera footage.
Screen recordings and phone clips shrink the most. If your original is already under 100 MB nothing needs to be done, though re-encoding can still lower it for faster sharing. The tool aims for roughly 93 to 95 percent of the limit so the finished file does not tip over it.
Need a different ceiling? Use the related pages for other common upload caps, or the general FileHost.net Video Compressor for manual quality control.