Free online PPTX to AVI converter

Some presentation players, video-editing systems, and older devices accept AVI but cannot play a PowerPoint file directly. Converting slides to video also makes them easier to distribute as a timed playback.

What the PPTX format is

PPTX is the Office Open XML presentation format used by Microsoft PowerPoint and supported by programs such as LibreOffice Impress. It stores slides, text, images, charts, transitions, and animation instructions; it is a presentation file, not a video.

What the AVI format is

AVI (Audio Video Interleave) is a multimedia container that can hold video and audio streams. It is supported by many desktop players and editing tools, but compatibility depends on the codecs inside the file; AVI does not specify a single video codec.

How to convert PPTX to AVI

Online on 101convert.com

1. Upload the PPTX file on the converter page. Several files can be added for batch conversion; check the per-file size limit shown on the page.
2. Set show each page for to choose how long each slide is displayed.
3. Start the conversion and download the resulting AVI file or files.

Offline with desktop software

Free option: LibreOffice and FFmpeg. On Linux or macOS, use LibreOffice Impress to open the presentation and export it as a PDF through File → Export As → Export as PDF. Convert the PDF pages to numbered PNG images with Poppler’s pdftoppm, for example: pdftoppm -png -r 150 presentation.pdf slide. Then use FFmpeg to make a video that holds each slide for five seconds: ffmpeg -framerate 1/5 -i slide-%d.png -vf fps=25 -c:v mjpeg -q:v 3 -an presentation.avi. Install LibreOffice, Poppler, and FFmpeg separately. This method renders slide appearance, but does not reproduce PowerPoint animations, transitions, narration, or embedded audio.

Microsoft PowerPoint and FFmpeg. In desktop PowerPoint, export the presentation as an MP4 using File → Export → Create a Video. Then convert the MP4 to AVI with FFmpeg: ffmpeg -i presentation.mp4 -c:v mjpeg -q:v 3 -c:a pcm_s16le presentation.avi. PowerPoint’s video export preserves timed playback and can include recorded timings and narration when configured; available export options vary by PowerPoint version.

Quality and compatibility

AVI is a container, so confirm which codecs the target player supports before choosing one. The FFmpeg commands above use MJPEG video and, for the PowerPoint route, uncompressed PCM audio; this combination is broadly supported but can produce large files. Video exported from PowerPoint and then re-encoded may lose quality, so use a high-quality source export and avoid repeated conversions.