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    CyberStock Free Tools

    Free Video Compressor

    Compress MP4, MOV, WebM, and MKV in your browser with FFmpeg.wasm. H.264 + AAC output, three smart presets, files never uploaded.

    FFmpeg.wasm in browser
    H.264 + AAC MP4
    Files never uploaded
    In short

    A free video compressor shrinks MP4, MOV, WebM, and MKV file size by re-encoding to efficient H.264 + AAC, so clips upload faster and play everywhere. This tool runs FFmpeg compiled to WebAssembly directly in your browser - videos are never uploaded - with three quality presets (CRF 22 / 26 / 30) to balance size against fidelity. Compressed clips then move into CyberStock for buyer-focused titles, keywords, and agency CSV exports.

    H.264 + AAC

    Outputs the most compatible MP4 codec pair for web, social, and every editor.

    0 uploads

    FFmpeg.wasm encodes on your own CPU - videos never leave your browser.

    3 presets

    High (CRF 22), Balanced (CRF 26), or Smallest (CRF 30) to trade size for quality.

    Up to 500 MB

    Compress files up to 500 MB each free; larger production batches on paid plans.

    Need batch encoding for 100+ videos?

    Paid CyberStock plans include server-side video encoding for production batches, plus stock-grade titles, keywords, and CSV exports.

    FAQ

    Video compressor FAQ

    Is the video compressor really free?

    Yes. Compression runs locally with FFmpeg compiled to WebAssembly. Up to 3 videos per session in the free tool.

    Are my videos uploaded?

    No. Videos never leave your browser. Encoding happens on your CPU using FFmpeg.wasm.

    Which formats work?

    Input: MP4, MOV, WebM, MKV, AVI. Output: H.264 / AAC in MP4 (the most compatible format for web, social, and editors).

    How long does it take?

    Single-threaded FFmpeg.wasm runs roughly 0.3-0.7x realtime on a modern laptop. A 30-second 1080p clip typically finishes in 1-2 minutes.

    What size limit?

    Up to 500 MB per file in the free tool. Logged-in users on paid plans can run larger production batches with server-side encoding.

    Which preset should I pick?

    High = best fidelity. Balanced = recommended for most uploads. Small = aggressive size reduction for chat/email.