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Online MKV Converter

Convert any audio and video to MKV in seconds straight from your browser. No installs. No watermarks. 100 % free.

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  • Free to try, no credit card
  • Rated 4.7 on Trustpilot

Why choose HappyScribe?

  • 40+ Formats

    Convert over 47 formats into popular outputs like MKV, MKV, WebM, AVI, and more.

  • 100% Free

    No signups, no fees, no hidden restrictions. Convert to MKV online for free.

  • Secure

    We take your security seriously. All file transfers use 256-bit SSL encryption.

  • Online

    No installs needed; convert to MKV right from your browser, on any device, anytime.

How to convert to MKV?

  1. Upload media file

    Start by dragging and dropping your file into the upload area, or click to browse your device and select your file in the list.

  2. Choose your target format

    Next, pick MKV as the format you’d like to convert your file into. We support 40+ formats in total. When you’re ready, hit the Convert button.

  3. Download your converted MKV

    Once the conversion is complete, you’ll get a download link right away. Just click to save the file to your device. It’s fast, easy, and doesn’t require any software installation.

Free online MKV converter

HappyScribe’s free MKV converter turns audio and video files into MKV online. Upload, convert and download in seconds, with no signup or watermark. When the source already uses a codec MKV supports, we copy it without re-encoding, so nothing is lost. Files are deleted from our servers one hour after processing.

Frequently Asked Questions

Will converting to MKV reduce quality?

When the source already uses a codec MKV supports, we copy it without re-encoding, so nothing is lost. Otherwise we re-encode at standard quality.

Can I convert a YouTube video to MKV?

No. The converter only works with files you upload from your device.

Are my files private?

Yes. All transfers are encrypted, and your files are deleted from our servers automatically one hour after processing. We never share them.

How to open a MKV file?

VLC, MPV, and Kodi handle MKV flawlessly on every OS. Editing suites such as DaVinci Resolve import common codecs like H.264 or ProRes within MKV, but for delivery you may still export MP4. MKVToolNix lets you split, merge, and tag tracks without re‑encoding.

What is a MKV file?

Matroska Video (MKV) is a flexible open container that can accommodate virtually any codec, multiple subtitle tracks, and chapter points. It is built on EBML (Extensible Binary Meta Language), a binary cousin of XML, allowing unlimited, self‑describing elements. The project began in 2002 after developer Steve Lhomme forked the failed MCF container. With the explosion of H.264 ‘fansubs’, MKV became the default wrapper for anime communities, bundling soft‑subs and styled karaoke effects. In 2013 Matroska was standardised within the IETF as the basis for WebM, cementing its longevity.

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