Free online PPS to WEBM converter

A PPS file opens as a PowerPoint slideshow, while browsers and video players can play WEBM files directly. Convert it when you need the slides delivered as a video rather than as a presentation.

What the PPS format is

PPS is a Microsoft PowerPoint Show file: a presentation that opens in slideshow mode. PowerPoint creates PPS files, and LibreOffice Impress can open them. A PPS contains slides and may include transitions, animations, audio, and timings; it is not itself a video.

What the WEBM format is

WEBM is a video container commonly used for web playback. It can hold VP8, VP9, or AV1 video and typically uses Opus or Vorbis audio. Choose it when a website, browser-based player, or video workflow needs a standalone video file.

How to convert PPS to WEBM

Online on 101convert.com

1. Upload the PPS file on the converter page. You can add several files for batch conversion; the per-file size limit is shown on the page.
2. Set show each page for if you want to specify how long each slide is displayed.
3. Start the conversion and download the resulting WEBM file.

Offline with desktop software

Free option: LibreOffice Impress and FFmpeg. In LibreOffice on Windows, macOS, or Linux, open the PPS and use File → Export to export all slides as PNG images. Create a text file such as slides.txt listing the images and their display times:

file 'slide1.png'
duration 5
file 'slide2.png'
duration 5
file 'slide2.png'

Replace the filenames and durations with your exported slides and desired timings; repeat the final image entry so its duration is included. Then run FFmpeg in that folder:

ffmpeg -f concat -safe 0 -i slides.txt -r 30 -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2,format=yuv420p" -c:v libvpx-vp9 -crf 32 -b:v 0 -an output.webm

This creates a silent video from static slide images. It does not retain slide animations, transitions, or embedded audio.

Microsoft PowerPoint option. In a desktop version that supports video export, open the PPS and use File → Export → Create a Video to produce an MP4, including presentation timings and narration where available. Convert that file with FFmpeg:

ffmpeg -i presentation.mp4 -c:v libvpx-vp9 -crf 32 -b:v 0 -c:a libopus output.webm

Quality and compatibility

The image-based method’s slide duration is set in slides.txt, and the output has no audio. The PowerPoint-and-FFmpeg route is preferable when the presentation’s animations, timings, or narration matter; check the exported MP4 before converting it, since video export support and options vary by PowerPoint version.