Compress video
Compress and shrink videos for free: choose resolution, quality and audio track yourself, result as MP4. Runs entirely in your browser, no upload.
Select a video
Drag your video here, or select it.
MP4, MOV, WebM, MKV · up to 15 minutes · no upload (everything stays on your device)
Compress a video without uploading it
A two-minute phone video can easily weigh in at three hundred megabytes. That is too much for sending by email, embedding on your own website or uploading to a portal with a size limit. This tool re-encodes your video directly on your device: there is no upload, no queue and no watermark.
This is made possible by the WebCodecs interface built into modern browsers: the same video encoder that video conferencing software uses. The video is read frame by frame, scaled to the resolution you choose and written again at the selected bitrate. The result is an MP4 file with H.264 video that plays on practically any device.
What really determines the file size
The resolution
The biggest lever. Going from 4K to 1080p quarters the number of pixels, and going from 1080p to 720p halves it again. For a website or social media, 720p is usually enough, as the video rarely plays there at more than a hand's width anyway. Important: it is always the short side that is limited. For a portrait video from a phone, "720p" therefore means 720 pixels wide, not high.
The bitrate
It determines how much information is stored per second. The "Medium" level almost always hits the right spot for web material; "High" is worthwhile for a lot of movement or fine detail, and "Low" when the file absolutely has to be small and a softer picture is acceptable.
The audio track
Audio usually accounts for only a few percent of the file. For videos that play silently in the background on a website anyway, dropping it still makes sense: it not only saves bytes but also prevents visitors from being surprised by sound.
How long does compression take?
Because the processing runs on your device, the time it takes depends on its performance. As a rough guide: on a current laptop, a one-minute Full HD video is often re-encoded in less than a minute, while an older smartphone takes considerably longer. Progress is shown, and you can cancel at any time. That is why the length is limited to fifteen minutes here.
Data protection: your video stays with you
There is no interface that video data could be sent to. You can verify this in any browser via the network view of the developer tools (F12 key): while compressing, not a single request with video data goes out. Especially for recordings in which people can be recognised, this is a tangible difference from online converters, which first upload your file to a third-party server.
Frequently asked questions
How do I compress a video for free?
Select a video or drag it into the field, set the resolution and quality level, deselect the audio track if you like and click the button. You then see the result directly in your browser, next to it how much smaller the file has become. There are no costs, no sign-up is required and there is no watermark.
Is my video uploaded to a server?
No. Your browser handles the transcoding itself via the WebCodecs interface. The video never leaves your device, there is no upload and we store nothing. You can verify this via the network panel of the developer tools (F12 key): not a single request with video data leaves your device while compressing. Especially for recordings of recognisable people, that is a tangible difference from online converters.
Which resolution should I choose?
For websites and social media, 720p is usually enough; there the video rarely plays larger than the width of a hand anyway. 1080p is worthwhile for full-screen playback, 480p for an email attachment. The short side is always what gets limited: for a portrait video from a phone, “720p” therefore means 720 pixels of width rather than height. Videos that are already smaller are never upscaled.
Which file formats can I use?
MP4, MOV (typical for iPhone), WebM and MKV are read. The output is always MP4 with H.264 video, a combination that plays on practically every device and is accepted by all common platforms.
How long can the video be?
Up to 15 minutes. The limit protects your own device, because transcoding is considerably more demanding than shrinking images and depends on your processor. On a current notebook, one minute of Full HD is often done in under a minute; on an older smartphone it takes noticeably longer. Progress is displayed, and you can cancel at any time.
Does the quality suffer visibly?
At the “Medium” level the difference is usually invisible on a website or in social media, yet the file is many times smaller. “High” is worthwhile for lots of motion or fine structures, “Low” when the file absolutely has to be small. Because you can watch the result directly in your browser, you see the difference before downloading.
Which browsers does this work in?
Chrome and Edge from version 94, Safari from 16.4 (including iPhone and iPad), Firefox from version 130 and Chrome for Android. Firefox for Android and older Safari versions are not supported. If your browser lacks the required interface, the tool tells you so as soon as you open it.
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