Free online PPSM to MKV converter

A PPSM file is a PowerPoint slideshow, not a video; converting it to MKV renders its slides into a video file. This is useful when a playback device or video library accepts MKV but cannot open PowerPoint presentations.

What the PPSM format is

PPSM is the PowerPoint Macro-Enabled Show format, created by Microsoft PowerPoint. It opens as a slideshow and can contain slides, transitions, animations, embedded media, and VBA macros; it is commonly received as a presentation that should start directly in slideshow mode.

What the MKV format is

MKV (Matroska) is a multimedia container for video, audio, subtitles, and chapters. It can hold multiple tracks and different supported codecs, making it useful for archiving or playback in software and devices that support Matroska. MKV is a container, not a video codec, and does not itself improve image quality.

How to convert PPSM to MKV

Online on 101convert.com

1. Open the PPSM-to-MKV converter page and upload the presentation. You can add several files for batch conversion; the page shows the per-file size limit.
2. Set show each page for to choose how long each slide appears.
3. Start the conversion and download the resulting MKV file.

Offline with desktop software

Free option: LibreOffice Impress and OBS Studio. LibreOffice runs on Windows, macOS, and Linux; OBS Studio is also available on those systems. Open the PPSM in Impress, start OBS recording with the recording format set to MKV, then run the slideshow and advance slides at the intended pace. Stop the recording after the final slide. This captures the displayed slideshow; it is a manual recording rather than a direct export, so slide duration depends on when you advance each slide.

Microsoft PowerPoint and FFmpeg. In PowerPoint, open the PPSM and use File → Export → Create a Video to export an MP4. Then use FFmpeg to place the video streams in an MKV container without re-encoding:

ffmpeg -i presentation.mp4 -c copy presentation.mkv

If the copied streams are unsupported by the target player, omit -c copy and choose a compatible video and audio codec in FFmpeg. Re-encoding can reduce quality.

Quality and limitations

Rendering turns slides into timed video, so viewers cannot click links, trigger animations, or run macros as they could in PowerPoint. Macro-driven or interactive behavior may not appear in an exported video; check the result, especially when the presentation depends on it. Slide timing, transitions, and narration can affect the final duration and should be reviewed before sharing.