Conversion

Convert MKV WEBM

Free online MKV video to WebM video converter. Lossy (size-optimized) quality, processed server-side, no signup required.

Convert MKV to WEBM now
ffmpeg Business Lossy (size-optimized) ~8.0s per MB

How to convert MKV to WEBM

  1. 1

    Open the converter

    Click the button above — the workspace opens with MKV pre-selected as your source and WEBM as your target.

  2. 2

    Drop your MKV video

    Drag and drop, or click to browse. Your file is uploaded over HTTPS and processed on our private servers — never shared with third parties.

  3. 3

    Download the WebM video

    The result downloads automatically when conversion finishes. Powered by ffmpeg — the same engine used by professional studios.

More conversions like this

Convert MKV to other formats

MKV AVI ffmpeg · BusinessMKV GIF ffmpeg · BusinessMKV MOV ffmpeg · BusinessMKV MP4 ffmpeg · Business

Other ways to make a WEBM

AVI WEBM ffmpeg · BusinessGIF WEBM ffmpeg · BusinessMOV WEBM ffmpegMP4 WEBM ffmpeg

Need a different conversion?

Browse the full format compatibility matrix or explore the Convert Tools hub — every supported pair in one place.

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