Video & audio converter
Video Compressor
Make video files smaller so they are easier to send and upload. Pick a quality level and download a compressed MP4.
Tested by Thiago · Updated
Free, no sign-up · Sent over HTTPS · Files are deleted from our server automatically after 30 minutes
How to compress a video
- Add your files: drag them into the box above, or click "Choose files".
- Pick a quality level, click "Compress video" and wait while we process it.
- Download your MP4 files. Uploaded files are deleted right away, and converted files are removed from our server after 30 minutes.
When to compress a video
Phone videos are huge, and many places limit file size: Gmail attachments stop at 25 MB, and chat apps and upload forms have their own limits. The ConvertKiwi video compressor re-encodes your video with the efficient H.264 codec and lets you choose between a much smaller file and a higher quality one, while the result stays a standard MP4 that plays everywhere.
- Your video is too big to email, upload or send in a chat.
- You want to save space on your phone or cloud storage.
- You need a lighter video for a website, presentation or course platform.
- You are sending a recorded presentation or a class to a platform that has an upload limit per file.
What each level did to our test video
We ran a 30-second, 57 MB clip in 1080p through all three levels. The clip was made from real photos with a slow zoom and camera grain, saved at a bitrate similar to a phone recording. Real footage with more movement and fine detail usually shrinks less, so treat these as a best case:
- Smallest file: 1.55 MB, reduced to 1280 by 720 pixels.
- Balanced: 5.98 MB, still 1920 by 1080.
- Better quality: 19.6 MB, at the original size.
- The same clip filmed upright (1080 by 1920) came out at 720 by 1280 on Smallest file. The 720 limit applies to the shorter side, so a vertical video keeps a sharp 720-pixel width instead of becoming a narrow strip.
Need to get under a specific size?
There is no box to type a target such as 10 MB: the levels set a quality, and the final size follows from how long the video is and how much happens in it. Size grows in step with length: at the same level, a video twice as long ends up roughly twice as big. So compress once, look at the result, and you can estimate how many minutes fit under your limit.
If the result is still over the limit, compressing it again will not help much and costs detail each time. Shorten the video instead, or cut it into two parts and send them separately.
Tips for the best result
- "Smallest file" limits the video to 720p, great for chats and email. "Balanced" keeps up to 1080p. "Better quality" keeps the original resolution.
- Videos that are already well compressed may not shrink much; if the result would be larger, you get your original MP4 back.
- Large files take a while: watch the conversion bar to see how long is left.
About these formats
Video formats: We accept MP4, M4V, MOV, WEBM, MKV and AVI videos, the formats used by phones, cameras, screen recorders and most editing apps.
MP4: The most widely supported video format. It plays on phones, browsers, TVs and social networks, with good quality at a reasonable size.
Frequently asked questions
How much smaller will my video get?
Phone videos often shrink by half or more with "Balanced", and more with "Smallest file". In our tests, a 1.8 MB clip became about 0.8 MB.
Which formats can I compress?
MP4, M4V, MOV, WEBM, MKV and AVI. The result is always an MP4.
Is the sound kept?
Yes. Audio is kept and encoded as AAC, the standard for MP4.
Can I compress a video to exactly 10 MB?
Not exactly. Pick Smallest file, check the size of the result, and if it is still too big, trim the video. Length is what decides the size once the quality level is fixed.
Why did my MOV come back larger after compressing?
Only MP4 and M4V files are handed back unchanged when compression would not make them smaller. Other formats, such as MOV, WEBM, MKV or AVI, are always turned into a new MP4. An iPhone video recorded in HEVC is already very efficient, so try Smallest file for it.
Helpful guides
- How to Reduce a Video File Size Without Ruining the Quality
- iPhone Videos Won't Play on Windows or Android? Convert MOV to MP4
- How to Make a Good-Looking GIF From a Video
- How to Add Subtitles to a Video (Automatically, for Free)
- Email Attachment Too Large? How to Shrink Videos, PDFs and Photos to Fit
- How to Send Large Video Files (From a Phone, by WhatsApp or Email)