Convert a video to MP4 or WebM in your browser, from MP4, MOV, MKV, WebM or MPEG-TS files. Choose MP4 (H.264) for a file that plays on phones, TVs and editing apps, or WebM (VP9 or VP8) for the web. Quality runs from Copy, which repackages the existing video without re-encoding where it can, through High, Balanced and Small to an exact size in MB, with an optional resize that never upscales. The same panel also turns a clip into a GIF or saves its soundtrack as WAV. Nothing is uploaded at any point.
How it works
- Drop a video in any of those containers. It is read in place; nothing is sent anywhere.
- Pick MP4 or WebM, a quality from Copy to Exact size, and if you need them a resize, a trim or no audio.
- Press Convert to MP4 (or WebM). Copy jobs are near-instant; re-encodes show progress and can be cancelled.
Questions
- Can it convert MKV, AVI or WMV files?
- MKV, yes, along with MP4, MOV, WebM and MPEG-TS (.ts), as long as your browser can decode the video codec inside; when it cannot, the tool says so plainly. AVI, WMV and FLV are not formats it can read, so those need a desktop converter first.
- Should I convert to MP4 or WebM?
- MP4 for almost everything: it is the format phones, TVs, office software and editors all accept. WebM is the open format browsers favour on the web, and at the same quality it is often smaller, which makes it a good fit for embedding on your own site. If someone else has to open the file, send MP4.
- What does the Copy quality option do?
- It moves the existing video stream into the new container without re-encoding, so quality is identical and even a long file is near-instant. It only works when nothing forces a re-encode: trimming from the start or resizing does, and so does a codec the chosen container cannot hold. Use it for MOV or MKV to MP4 when the video is already H.264.
- Does my file get uploaded?
- No. The models and all processing run inside your browser on your own device. You can verify this yourself: open your browser’s DevTools, watch the Network tab, and process a file: there are no uploads. After the first visit most tools also work fully offline.
- Which formats are supported?
- MP4 and WebM out, with H.264, VP9 or VP8 video depending on what your browser can encode. The tool only offers what it has verified will work on your machine: HEVC and AV1 encoding are not available in browsers today, so they are not offered.
- Why is compressing sometimes instant and sometimes slow?
- Trimming, muting and container changes copy the existing video stream without re-encoding, so the result is near-instant. Changing quality or resolution requires a real re-encode at roughly playback speed on typical hardware.
- How big will my GIF be?
- The panel estimates the size before you export. GIFs are an old format and get large fast, so trimming the clip and lowering the width are the two controls that matter.