Video compressor
Shrink a video for sharing.
Change video aspect ratio
Fit a video to 9:16, 1:1, 4:5 and 16:9.
or drag and drop videos here
MP4, MOV, WebM or MKV videos
Your files stay on your device
- 1Add files
- 2Adjust
- 3Download
How it works
- 1Choose a video, or drag it onto the page. Files up to 300 MB are accepted.
- 2Pick the new shape: 9:16 for Reels, Shorts and Stories, 1:1 for square posts, 4:5 for portrait posts, 16:9 for widescreen.
- 3Choose how to fill the frame: a blurred copy of the video, plain colour bars, or a crop.
- 4Select Change aspect ratio and download the MP4.
What the options do
- Blurred background
- The whole video sits in the middle, over a blurred, enlarged copy of itself. This is the usual look for vertical posts made from wide videos.
- Colour bars
- The whole video sits in the middle on a flat colour of your choice.
- Crop to fill
- Fills the whole frame and trims what does not fit from the sides or the top and bottom.
- Quality
- HD uses a short side of 720 pixels. Full HD uses 1080 and takes about twice as long.
Privacy
The video is processed by a converter running inside your browser. It is never uploaded to a server.
Questions people ask
Is my video uploaded?
No. The video is reframed in your browser with a WebAssembly build of ffmpeg. It stays on your device.
Which shape should I choose?
9:16 for Instagram Reels, TikTok, YouTube Shorts and Stories. 1:1 and 4:5 for feed posts. 16:9 for YouTube and most screens.
Does the sound stay?
Yes. The sound is kept.
How long does it take?
The video is re-encoded on your device, so expect a few times the length of the video. The progress shows as a percentage.
What sizes do I get?
At HD: 1280 x 720 for 16:9, 720 x 1280 for 9:16, 720 x 720 for 1:1 and 720 x 900 for 4:5. Full HD is 1.5 times larger.
How big a video can I use?
Up to 300 MB. Phones have less memory than computers, so keep videos below about 100 MB there.