Video Converter
This free video converter tool changes your clip's format, shrinks its size, trims it, or scales it down — all through ffmpeg running in your browser. Drop a video, set your options, and download the result without anything leaving your device.
Runs entirely in your browser via ffmpeg.wasm — the video never leaves your device. Transcoding is CPU-bound; long or high-resolution clips can take a while.
How to use Video Converter
- 1 Drop a video onto the box or click to browse for one.
- 2 Choose an output format — MP4 (H.264), WebM (VP9), or MOV — and set the CRF quality slider.
- 3 Optionally set a target width, a start time and length to trim, or tick Drop audio.
- 4 Click Convert, watch the progress bar, then preview and download the result.
Frequently asked questions
Is my video uploaded to a server?
No. Transcoding runs entirely in your browser via ffmpeg.wasm, so the video never leaves your device — good for private or large files.
How do I make the file smaller?
Raise the CRF value for more compression, set a smaller target width, and optionally drop the audio track. The result shows its size as a percentage of the original.
Can I trim the video?
Yes. Enter a Start time in seconds and a Length in seconds to export just that portion; leave them blank to convert the whole clip.
Why is the first run slow?
The first conversion downloads the video engine (about 31 MB) and transcoding is CPU-bound, so long or high-resolution clips take longer. After the first load the engine is cached.