Free online PDF to MKV converter

A PDF may need to play on a device or in a workflow that accepts video but not documents. Converting it turns each page into a still frame in a video, usually without audio.

What the PDF format is

PDF preserves page layout, fonts, and graphics across devices, so it is commonly used for forms, reports, manuals, and scanned documents. PDFs are created by tools such as Adobe Acrobat, office suites, and document scanners; they can be opened with Acrobat and many browser or document-viewing apps.

What the MKV format is

MKV, or Matroska, is a container for video, audio, subtitles, and other tracks. It can hold different video codecs and multiple tracks in one file. An MKV made from a PDF is typically a silent slideshow: each PDF page becomes a video frame, so text is no longer selectable or searchable as document text.

How to actually convert PDF to MKV

Online on 101convert.com

1. Open the PDF-to-MKV converter page and upload the PDF. Several files can be added for batch conversion; each file is subject to the size limit shown on the page.
2. Set Show each page for to choose how long each page appears.
3. Start the conversion and download the resulting MKV file.

Offline with desktop software

On Windows, macOS, or Linux, use Poppler’s pdftoppm to render pages as images, then FFmpeg to assemble them into a video. Install both tools, open a terminal in a working folder, and run:

1. Render the pages to PNG files at 150 dpi: pdftoppm -png -r 150 input.pdf page. This creates files such as page-1.png and page-2.png.
2. Make each page last five seconds and encode the video: ffmpeg -framerate 1/5 -i page-%d.png -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,format=yuv420p" -c:v libx264 output.mkv.

The command fits pages inside a 1920 × 1080 frame and adds black bars where needed to preserve their proportions. Change 1/5 to adjust the display time per page; the output has no audio track.

Quality and compatibility

PDF pages are rasterized, so output clarity depends on the rendering resolution and video frame size; small text may be hard to read after scaling. The sample FFmpeg command uses H.264 video in an MKV container, but playback depends on the device supporting both MKV and H.264.