Video converter for MP4, WebM and MOV
Use the video converter to choose a supported output format and download a re-encoded video. Free to use, with no sign-up required.
Files processed on your deviceFFmpeg runs locally in your browser. First use loads a roughly 32 MB same-origin WebAssembly core and can take time and use substantial memory. Combined inputs are limited to 100 MB, media duration to 30 minutes, frame dimensions to 4,096 pixels per side and 16 megapixels total, and output to 250 MB. Codec and filter support depends on the bundled build.
01 How it works
- Choose one video file.
- Select MP4, WebM, or MOV.
- Transcode and download the output.
02 Good to know
Conversion re-encodes the video and audio with encoders available in the bundled FFmpeg core. The chosen container may fail if a compatible encoder or source codec is unavailable.
03Choose a video conversion format
Choose a video, select MP4, WebM, or MOV, then run the conversion and download the result. Conversion re-encodes the video and audio using encoders in the bundled FFmpeg core.
A container choice alone does not guarantee a successful conversion. The source codec must be readable and the bundled core must include compatible encoders for the selected output.
04Limits and compatibility
FFmpeg runs in your browser. Its first use downloads a roughly 32 MB WebAssembly core. Combined inputs are limited to 100 MB, media duration to 30 minutes, dimensions to 4,096 pixels per side and 16 megapixels total, and output to 250 MB.
05 Questions
Why can a selected format fail?
The source codec may be unsupported, or the bundled FFmpeg core may not include a compatible encoder for that output.
Does conversion preserve the original quality?
Conversion re-encodes the streams, so output quality can change. The result depends on the source and available encoders.
Will changing the file extension convert the video?
No. Conversion re-encodes the audio and video streams into a selected container using compatible encoders.