Clipchamp Video Compressor
This online MP4 compressor will ask you to sign in with your Google+/Facebook/Email account for using free basic version with watermark.
Seems to be a really decent online MP4 reducer to use! You can optimize the video for Mobile sharing, Web sharing, Windows platform and even GIF animation. You are free to customize video resolution, format, quality and edit video - flip, rotate, crop, trim, etc. But the vital trouble comes with its processing speed. Waited for 30 min to get a 1% done notice for my 1GB MP4 movie to be compressed.
An honest video file size reducer to let you compress MP4 file at max 500MB size. You can scale to ideal video width and remove audio from the video.
Though the features of this online MP4 compressor is limited compared to Clipchamp, it does not require log-in or your email address. It has very simple and straight forward workflow and service features.
The main problems of these online MP4 compressors are:
1. Slow slow slow processing speed;
2. Highly interrupted by uploading/downloading errors;
3. Video file size limitation (1GB video file compressing is 100% out of question);
4. Possibility of video leakage
The fact is, reducing MP4 video online only applies to small size videos to be shrinked even smaller for web/mobile sharing or making GIFs. To seriously compress a large MP4 file, like when you need to download Coursera to iPad without losing quality requires a stable platform rather than online.