Choose your video
Choose your .mp4 file.
MP4 in, smaller MP4 out
Compress MP4 Online
Make an MP4 easier to send while keeping broad playback compatibility.
No uploadNo watermarkNo signup
Drop a video here to startChoose a video to compress
MP4, MOV, WebM, MKV, AVI + more · Up to 1GB desktop / 300MB mobile
On-device processing · Never uploaded or storedRecommended settings
A sensible place to start
Choose H.264, Balanced quality and 720p for a dependable sharing copy.
The compressor above is preconfigured for this use case. Actual results still depend on the source codec, motion and detail.
Why it works
Spend fewer bits, deliberately
MP4 is a container, so results depend on the video and audio codecs inside it. Re-encoding H.264 at a lower bitrate usually creates a more compact, compatible file.
Three simple steps
How to compress mp4 online
Set the compression
Pick a reduction preset or size limit.
Download the result
Download the locally encoded H.264 MP4.
Practical guidance
Get a cleaner result
- Use 720p for messaging and email.
- Keep 1080p when text must stay crisp.
- Some already-optimized MP4 files shrink less.
Clear answers
Frequently asked questions
Is MP4 compression private?
Yes. Standard compression runs inside your browser. The video file is not sent to a VideoShrink server.
Will the output size be exact?
Target-size mode aims slightly below your limit, but container overhead and unusual source files can make the final size vary.
Why can compression take a while?
Encoding is demanding work. Duration, resolution, device speed and browser memory all affect processing time.
Make your video easier to share
Private browser compression. No account required.
Compress Video