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MP4 Video Compressor

Reduce video size locally with adjustable H.264 quality and audio bitrate.

FFmpeg.wasm · Web Worker

The ~32 MB single-thread core downloads only when processing begins and is browser-cached. It has fewer codecs than desktop FFmpeg, and speed depends on your CPU and memory.

GUIDE

How to compress MP4 without uploading it

Video size depends on resolution, frame rate, codec, and bitrate. This tool runs FFmpeg.wasm in a Worker and re-encodes H.264/AAC with small, balanced, or high-quality settings.

Browser FFmpeg is slower than a desktop app and constrained by tab memory. Test a short file first and keep a backup of important originals.

  1. 01

    Choose a video

    Select a local file and let the tool check size, duration, and dimensions.

  2. 02

    Choose quality

    Balanced suits normal sharing; Small targets the lowest size.

  3. 03

    Process and download

    The core loads only now. Compare sizes and download the result.