MP4 size reducer
Reduce MP4 file size in your browser.
Pick an MP4, choose simple compression settings, and download a smaller MP4 while the source file stays local.
Reduce MP4 size
Create a smaller MP4 for sharing, posting, or attachment workflows.
Your selected video is processed in this browser tab. It is not uploaded to a conversion server.
Ready.
Best way to reduce MP4 size
The biggest file-size levers are duration, resolution, and bitrate. This page handles resolution and bitrate in a simple browser workflow.
Best settings and limits
Best first try
Use 720p for normal sharing and 480p for a more aggressive size reduction.
When this may fail
If the MP4 is long, you may need to trim it elsewhere before compression is enough.
Privacy boundary
The selected video file stays on your device while the tool creates the output.
Frequently asked questions
How do I reduce MP4 file size?
Choose a lower resolution or stronger compression, then run the local tool.
Does this work without upload?
Yes. The selected MP4 is processed locally in the browser tab.
Can it hit an exact file size?
The output size is an estimate. Exact targets depend on video content and duration.