Free online DOCX to MKV converter

When a screen or video workflow accepts MKV but not Word files, a DOCX can be turned into a timed sequence of page images. The result is a video rendition, not an editable document.

What the DOCX format is

DOCX is the default document format for recent versions of Microsoft Word. It stores text, page layout, images, tables, and styles; LibreOffice Writer and other word processors can also create and open it. DOCX files are commonly used for reports, letters, and other paginated documents.

What the MKV format is

MKV, or Matroska, is a multimedia container that can hold video, audio, subtitles, and other tracks. It is useful for storing video with multiple tracks, but support depends on the playback device and the codecs inside the file. Converting document pages to MKV produces a video track; it does not make the document’s text selectable or editable.

How to convert DOCX to MKV

Online on 101convert.com

1. Upload the DOCX file on the converter page. You can add several files for batch conversion; the page shows the per-file size limit.
2. Set show each page for to the duration you want each page displayed.
3. Start the conversion and download the resulting MKV file.

Offline with desktop software

A free workflow uses LibreOffice, Poppler’s pdftoppm utility, and FFmpeg. These tools are available for Linux, macOS, and Windows. First export the document to PDF with LibreOffice, which preserves its page layout:

libreoffice --headless --convert-to pdf --outdir . input.docx

Render the PDF pages as numbered PNG images:

pdftoppm -png -r 150 input.pdf page

Encode the images as an MKV slideshow, with each page shown for five seconds:

ffmpeg -framerate 1/5 -i page-%d.png -r 25 -c:v libx264 -pix_fmt yuv420p output.mkv

Change 1/5 to another frame rate to change the page duration; for example, 1/8 displays each page for eight seconds. Install the tools separately if they are not already available, and run the commands in a terminal from the folder containing the files.

Quality and limitations

The video contains rendered page images, so text search, links, document structure, and editing are lost. Page breaks and appearance depend on the fonts and layout used when LibreOffice opens the DOCX. The -r 150 setting controls rendering resolution; increasing it can improve legibility but creates larger images. H.264 with yuv420p is widely supported, but an MKV player must support that codec.