Ruks - Compressedmp4

: A powerful, free tool favored by video editors for its wide range of professional functions and batch processing. Common Compression Tips

: A more beginner-friendly option that uses hardware acceleration to shrink large 4K or 8K files quickly.

: Simply "zipping" an MP4 file (using 7zip or WinZip) rarely reduces the size because MP4s are already compressed; you must "transcode" or "re-encode" the video to see real results.

Video Compressor | Reduce Video File Size Online - FreeConvert

: A reliable web-based tool if you don't want to install software, though it often has file size limits for free users.

If you are looking to compress MP4 files, professional and community-recommended tools for this purpose include: