Convert MKV to WebM

Upload an MKV file and convert it to WebM. When the codecs already fit the target container, the conversion is lossless and near-instant; otherwise the video is re-encoded.

Your file never leaves your device. All processing happens right in your browser, and nothing is uploaded to a server.

Two open containers, one conversion

WebM is technically a constrained Matroska, but it admits only VP8, VP9, and AV1 video with Opus or Vorbis audio. MKVs holding those codecs convert by lossless copy; the common H.264 variety is re-encoded to fit, at high quality.

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