Video & Audio
Compress Video
Make a video smaller, at the quality and picture size you choose. No upload, no signup.
Files stay on your device How it works
Drop a file here, paste, or
MP4, MOV, WebM or MKV · one file, up to 25 MB
Your files
Your file is ready
How to compress a video
- Choose a video, MP4, M4V, MOV, WebM or MKV, up to 25 MB and 30 minutes long. A line under it shows its length, picture size and formats.
- Pick a quality level and, to save the most, a smaller picture size.
- Press Compress video. A progress bar shows how far it has got, and Cancel stops it. Then compare the sizes and download.
What the choices do
- Quality: sets the bitrate, the amount of data each second of video gets, from the picture size and frame rate. High quality keeps more detail in a larger file; Smallest file saves the most, and fast motion may look blocky.
- A ceiling: the tool never asks for more than 85% of the original video’s own bitrate, so it doesn’t set out to make a file larger.
- Picture size: 1080p, 720p and 480p set the short side, the height of a landscape video or the width of an upright one. 720p has under half the pixels of 1080p, so scaling down saves the most.
- Sound: AAC sound is copied as it is. Other sound is converted to AAC, except in Firefox, which can’t make AAC and keeps it as it is.
Why some videos barely shrink
Phone videos are often already well compressed, so at Balanced and the same picture size, one may shrink only a little. Compare the original’s size in your file list with the new size under the result. If the difference is small, try Smallest file or 720p, or keep the original.
How it works
The video is re-encoded as H.264 in an MP4 by your browser’s own encoder. Re-encoded video is at most 1920 × 1080, so 4K is scaled down whatever you choose. Re-encoding takes a while, longer for longer videos, and runs on your device. The result shows the new size, the picture size and a note of what’s inside, such as “H.264 video · AAC sound (copied)”. It works in current Chrome, Edge and Firefox, and in Safari 16.4 or later; a browser that can’t re-encode video says so as the page opens.
Good to know
One video at a time, and nothing is uploaded. The copy keeps its name with “-compressed” added, so holiday-clip.mov becomes holiday-clip-compressed.mp4. Cutting the length saves space too: use Trim Video first. To keep only the sound, use MP4 to M4A.