Compress MP4
Runs in your browser. The first time it downloads the ffmpeg engine (~30 MB).
How to compress a video
- 01Add your videoSelect or drag an MP4, WebM or MOV file into the box.
- 02Set the level and formatChoose the compression strength and the output format.
- 03DownloadSave the smaller video. All processing happens locally in your browser.
About the engine
The first use downloads the ffmpeg engine (about 30 MB) into your browser and caches it. After that, compression always runs on your device without uploading the video. Long videos take longer, depending on your computer.
FAQ
How do I compress an MP4 video?
Add the MP4, choose the compression level and download. The first time, the ffmpeg engine (about 30 MB) is downloaded.
Are my files uploaded?
No. Compression runs in your browser via ffmpeg.wasm. Your video never leaves your device.
How do I reduce the size of an MP4 video?
Load the video, pick a compression level and output format, and download. Everything is processed on your device.
How do I convert a video to MP4?
Pick MP4 as the output format: the tool converts and compresses at the same time, using the ffmpeg engine.
Why does the first run take a moment?
The ffmpeg engine (about 30 MB) loads once on first use, then stays cached for the session.
Which formats are supported?
Input and output cover the common web formats: MP4 (H.264), WebM and MOV.
Is it free?
Yes. No signup, no limits, no watermark.
