Which source videos can I convert?

This tool accepts video files supported by the bundled ffmpeg build. The file never leaves your device, so there is no upload limit — the only ceiling is what your browser can hold in memory.

Which codecs are used for MP4 and WebM?

MP4 output uses H.264 video with AAC audio. WebM output uses VP9 video with Opus audio.

Will choosing 1080p upscale a smaller video?

No. The scale filter limits height without enlarging a source that is already smaller, and keeps dimensions even for codec compatibility.

What does the quality setting change?

It changes the codec quality factor used during re-encoding. Higher quality generally retains more detail and creates a larger file, but the exact result depends on the source.

Video Converter & Compressor

LocalFree

Convert videos between formats and shrink their size with quality and resolution controls — processed on your device with ffmpeg.

or drop it here

Choose a video to convert or compress.

About the converter

Choose MP4 or WebM, a quality level, and an optional lower resolution. The converter re-encodes the video in your browser with ffmpeg compiled to WebAssembly; lowering quality or resolution generally reduces the output size. Nothing is uploaded.

How to use Video Converter & Compressor

1Select one video, then choose MP4 or WebM output.
2Set the quality and keep the original resolution or choose a maximum height from 360p to 1080p.
3Convert the video in the browser, preview the result, then download it.

Frequently asked questions

Which source videos can I convert?: This tool accepts video files supported by the bundled ffmpeg build. The file never leaves your device, so there is no upload limit — the only ceiling is what your browser can hold in memory.
Which codecs are used for MP4 and WebM?: MP4 output uses H.264 video with AAC audio. WebM output uses VP9 video with Opus audio.
Will choosing 1080p upscale a smaller video?: No. The scale filter limits height without enlarging a source that is already smaller, and keeps dimensions even for codec compatibility.
What does the quality setting change?: It changes the codec quality factor used during re-encoding. Higher quality generally retains more detail and creates a larger file, but the exact result depends on the source.