MP4 shrinker
Shrink an MP4 file without uploading it.
Make an MP4 file smaller with local compression settings. Useful when an MP4 is too large to send, attach, or post.
Shrink MP4 file
Lower MP4 file size with simple quality and resolution controls.
Your selected video is processed in this browser tab. It is not uploaded to a conversion server.
Ready.
Shrinking MP4 means re-encoding
MP4 files shrink when the output uses less video data. This tool lowers resolution and compression quality to create a smaller MP4.
Best settings and limits
Best first try
Try Balanced at 720p first. For stricter limits, use Smallest file and 480p.
When this may fail
An MP4 that is already heavily compressed may not shrink much without visible quality loss.
Privacy boundary
The selected video file stays on your device while the tool creates the output.
Frequently asked questions
Is shrink MP4 the same as compress MP4?
For this tool, yes. Both phrases mean creating a smaller MP4 through re-encoding.
Will the output stay MP4?
Yes. The download is an MP4 file.
Is my MP4 uploaded?
No. It is processed in this browser tab.