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MP4 Compressor

Compress an MP4 video locally with adjustable compression and resolution settings. Smaller output is not guaranteed, especially for already optimized sources. Re-encoding can reduce quality; keep your original file.

.mp4, .m4v · Up to 100 MB per file

    Compression can reduce visual quality. Already optimized videos may become larger; compare sizes before downloading.

    On first use, about 10 MB of conversion software downloads from this site. Your files stay local. Short clips work best; processing stops after ten minutes. Unsupported codecs, protected files, or insufficient memory can prevent conversion. Bitrate applies to lossy audio outputs; WAV and FLAC use lossless encoding. Extra tracks, subtitles and metadata are not preserved.

    How to use MP4 Compressor

    1. Choose your MP4 video.
    2. Select a compression level and maximum resolution.
    3. Compress on your device; cancel if needed.
    4. Compare the input and output sizes and download your result.

    Frequently Asked Questions

    Clear answers regarding conversion, privacy, and technical capabilities.

    Are my files uploaded?

    No. The browser downloads conversion software from this website, then processes your file in a local Web Worker. There is no conversion server.

    Will every file with these extensions work?

    Container support does not guarantee every codec variant. Damaged, encrypted, DRM-protected or unusually encoded media may fail. Keep your original files.

    What are the size and time limits?

    Inputs are limited to 100 MB and processing to ten minutes per job. Large or long media can exceed your device memory. Mobile devices should start with short clips. Video output is capped at the selected resolution, up to 1080p.

    Does changing the format improve quality?

    Re-encoding can lose quality. Converting a lossy source to a lossless format cannot restore discarded detail. Metadata, subtitles, extra tracks and attachments are not retained; the first video/audio track is used.

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