Compress MP4 Video Online
MP4 is the most common video format, but phone and camera recordings are often exported at a much higher bitrate than you need for sharing.
Drop your video here
or browse your files
Processed on your device — nothing is uploaded
Keeps the .mp4 container, so it stays compatible with every device and platform
H.264 encoding at a lower CRF cuts size without a visible quality drop for most content
Faststart flag moves metadata to the front, so the video starts playing before it fully downloads
Why compress MP4 files?
Re-encoding an MP4 at a lower CRF keeps the same container and codec compatibility while cutting file size significantly — ideal before uploading or sending.
How it works
Step 1
Upload
Drop your file in — up to 500MB free.
Step 2
Pick a quality
Basic, Strong, or Superb compression.
Step 3
Download
Get your smaller video in seconds.
Frequently Asked Questions
MP4 is a container, not a compression setting — phones and cameras often record at a high bitrate (sometimes 4K/60fps) inside that container, which produces large files even though the format itself supports much smaller sizes.
No, resolution stays the same by default. Compression lowers the bitrate (how much data is used per second of video), which reduces file size while keeping the frame dimensions intact.
They map to different CRF (quality) values in the H.264 encoder — Basic keeps more detail with a smaller size cut, Superb pushes compression further for the smallest possible file at the cost of some sharpness.
Yes, the audio track is re-encoded to AAC alongside the video. Embedded subtitle tracks aren't preserved — burn them in beforehand if you need them visible.
Yes — video compression is lossy, so re-encoding an already-compressed file loses a little more detail each time. Always compress from your original/source file rather than a file you've compressed before.