mkvtomp4
Compress a file
MOV Compressor
Make a video small enough to send. Nothing is uploaded.
This page takes one file at a time, so we took the first one.
How small should it be?
This computer has no decoder for this video's format (HEVC), so it will be decoded in software and take several times longer than usual.
Compressing…
Done
Only need the MOV to play on Windows or Android, at full quality? Our free Chrome extension turns MOV into MP4, a whole folder at once.
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Free · No sign‑up · Works best in Chrome or Edge on a computer
How to compress a MOV file
- 1
Drop the video
A MOV from an iPhone or a camera, or an MP4 or MKV. Big files are fine because nothing is uploaded.
- 2
Pick the size
Sending it by email? Take "For email". Otherwise "Balanced" cuts most videos to about a third. You'll see the new size before you start.
- 3
Wait a little
The video is re-encoded on your computer. On a slow computer that takes about as long as the video plays. Keep the tab open until it's done.
Which size to pick
What we got from a one-minute 1080p phone video of 146 MB. Each took about a minute on a 2-core machine without a graphics card.
24 MB
Fits the 25 MB attachment limit in Gmail. The picture stayed 1080p.
44 MB
About 30% of the original. Picture similarity to the original measured 0.99 out of 1 (SSIM).
87 MB
About 60% of the original, for a video you want to keep. Similarity 0.997.
Same size
A lower resolution doesn't change the size you picked, and it takes longer to make. Use it when the video will only be watched on a phone.
Questions
Is my video uploaded anywhere?
No. Compression runs in your browser on your computer. The video never reaches our server, and we don't see its name.
Why do I get an MP4 and not a MOV?
MP4 with H.264 plays everywhere: iPhone, Mac, Windows, Android, TVs and every website. The file inside is the same kind of video, just in a container that nobody has trouble with.
Will the quality drop?
A little, that's how compression works. Phones record with a lot of room to spare: on our test video "Balanced" scored 0.99 out of 1 on SSIM, a standard picture similarity score. The smaller the size you pick, the softer the picture gets.
Why does it take longer than a converter?
Changing MOV to MP4 often just repacks the video. Compressing has to redraw every frame, so on a slow computer it takes about as long as the video plays.
Can I compress several videos at once?
Not on this page, it takes one video at a time.