Free online PPTM to MKV converter

A PPTM presentation needs to become a video when the recipient or playback device cannot open PowerPoint files. MKV suits playback or archiving in software that supports Matroska, but the conversion produces a video rather than editable slides and does not carry VBA macros.

What the PPTM format is

PPTM is the macro-enabled presentation format used by Microsoft PowerPoint. It can contain slides, animations, transitions, media, and VBA macros. You may receive one when someone saves a PowerPoint presentation with macros or downloads a macro-enabled presentation.

What the MKV format is

MKV, or Matroska Video, is a container for video, audio, subtitles, and related tracks. It is useful for storing a presentation as a video with audio or subtitles, provided the playback device supports MKV and the codecs inside it.

How to convert PPTM to MKV

Online on 101convert.com

1. Open the PPTM-to-MKV converter on 101convert.com and upload the presentation. Multiple files can be added for batch conversion; the page shows the per-file size limit.
2. Set show each page for if you want to specify how long slides display.
3. Start the conversion, then download the resulting MKV file.

Offline with desktop software

Free option: OBS Studio with LibreOffice Impress. OBS Studio runs on Windows, macOS, and Linux and can record a slideshow directly to MKV. Open the PPTM in LibreOffice Impress, set up the slideshow, and in OBS choose Settings → Output → Recording Format → Matroska Video (.mkv). Add a display or window capture source, start the slideshow, start recording in OBS, and stop the recording after the final slide. Check the saved MKV to confirm that slide timing and audio were captured as intended.

Commercial option: Microsoft PowerPoint with FFmpeg. In PowerPoint for Windows, open the presentation and choose File → Export → Create a Video. Select a resolution and whether to use recorded timings and narrations, then create an MPEG-4 video. Remux it to MKV with FFmpeg:

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

Quality and limitations

PowerPoint exports the presentation as a rendered video; slide objects are no longer editable, and interactive controls or VBA macros are not included as working features. If a macro changes slides or content, run it in PowerPoint before recording or exporting. LibreOffice may not reproduce PowerPoint VBA behavior, so use PowerPoint for presentations that depend on macros.

The FFmpeg command copies the MP4 audio and video streams without re-encoding, so it avoids generation loss when the streams are compatible with MKV. OBS recording quality depends on its recording settings, and screen capture can include desktop elements unless the capture source and display are configured carefully.