Converter
Video to Smaller MP4 Converter
Convert Video to Smaller MP4 locally in your browser. Shrink MP4/MOV/WebM videos locally with FFmpeg.
Raise the CRF slider for smaller files. Output is capped to 1280px wide.
Add video
MP4, MOV, WebM, MKV, AVI — up to 2 GB per file.
Output format & settings
Reduce video file size by re-encoding to H.264 with a higher CRF and capped resolution.
Frequently asked questions
Quick answers about converting Video to Smaller MP4 in your browser.
How do I convert Video to Smaller MP4?
Add your Video file to the converter, adjust the available options, start the conversion, and download the Smaller MP4 file. Everything runs in your browser.
Is the Video to Smaller MP4 converter free?
Yes. The Video to Smaller MP4 converter is completely free with no sign-up, no watermarks, and no file count limits.
Are my files uploaded to a server?
No. Your files are read and converted locally in your browser, so they never leave your device.
What devices and browsers are supported?
It works in any modern browser on desktop, laptop, tablet, or phone — there is nothing to install.
Are there any limitations?
Large files are slow in WebAssembly and must stay under 2GB.