Private by default
Video processing runs in your browser. No account or upload queue is required.
MP4 compression for sharing
Compress MP4 videos online
Make large MP4 files easier to send, store, and publish. MediaKit compresses your video locally in the browser, so the original file never leaves your device.
Compress an MP4 nowFiles stay in your browser
Simple workflow
Get the right output in three steps
1
Choose an MP4 video
Drag in one or more MP4 files from your computer or phone.
2
Pick a sharing preset
Use the sharing preset for a smaller file, or tune quality and dimensions yourself.
3
Download the result
Preview the compressed video and download the MP4 when it is ready.
Built for the task
A faster path from source file to finished result
Built for real files
Batch-process multiple videos and keep MP4 output ready for messaging, email, or a website.
Clear size feedback
See original and compressed sizes so you can quickly choose the right quality.
Frequently asked questions
Can I compress MP4 without uploading it?
Yes. MediaKit uses browser-based processing for MP4 compression, so your video stays on your device.
Will the compressed file stay in MP4 format?
Yes. The recommended sharing preset outputs an MP4 file with browser-friendly H.264 video.
Can I compress more than one MP4?
Yes. Add multiple supported video files and download each result or a ZIP archive.
Ready to start?
Open the full tool and process your file locally.