Video Converter: Convert, resize and re-encode videos to MP4 or WebM. Input: Video, MP4, WEBM, MOV, M4V, MKV files and values you enter. Output: Results shown on the page and a downloaded file. Privacy: Runs in your browser: inputs and files stay on your device and are not uploaded.
How to convert or compress a video
- Drop a video your browser can play (MP4, WebM, and MOV in Safari).
- Optionally set a start and end time to trim it; use the player and the "= current" buttons to pick exact points.
- Choose the output format, resolution and quality. Lower resolution and "Small file" give the biggest size reduction. Tick Remove audio for a silent video.
- Click Convert, then download the result. To fit an upload limit, type a target size in MB.
What your browser can do (and can't)
This tool decodes and re-encodes video with your browser's built-in codecs (the WebCodecs API), frame by frame and faster than the video plays, and writes a standard MP4 (H.264 + AAC) or WebM (VP9 + Opus) file. Browsers without WebCodecs fall back to recording the video while it plays (the MediaRecorder API), which runs at playback speed. The format menu only lists what your browser can make. The trimmer copies the original video without re-encoding when it can, so the cut starts at the nearest key frame.
Because everything is re-encoded, quality is reduced a little even at "High"; it is a practical tool for making videos small enough to email, upload or share in chats, not a lossless editor. Videos the browser cannot decode, such as many HEVC/H.265 files in Chrome, cannot be converted here. Runs in your browser. Your files are not uploaded.
How much smaller will my video get?
Phone videos at 1080p or 4K often shrink by 70–90% at 720p "Medium". Results depend on the content.
Why does converting sometimes take as long as the video?
Only in browsers without WebCodecs: there the clip is played once while it is recorded.
Can I convert MOV to MP4?
Only if your browser can play the MOV file. Safari usually can; in Chrome, H.264 MOV files work but HEVC ones often do not.