Free online PPT to WEBM converter

Some websites and browsers accept WebM video but not PowerPoint files, so a slide deck must be rendered before it can be shared there. Converting also changes the presentation into a timed video; viewers can no longer edit individual slides or advance them independently.

What the PPT format is

.ppt is the binary presentation format used by Microsoft PowerPoint 97–2003. It stores slides, text, images, layouts, transitions, and other presentation content. You may encounter it in older decks created with PowerPoint or opened in newer PowerPoint versions and LibreOffice Impress.

What the WEBM format is

WebM is a video container designed for web playback. It commonly carries VP8 or VP9 video and may contain Vorbis or Opus audio. Modern browsers support WebM, making it useful for embedding or sharing a presentation as a video; unlike a PPT file, it does not preserve editable slide objects.

How to convert PPT to WEBM

Online on 101convert.com

1. Upload the PPT file on the converter page. Several files can be added for batch conversion; each file is subject to the size limit shown on that page.
2. Set show each page for to choose how long each slide appears.
3. Start the conversion and download the resulting WEBM file.

Offline with desktop software

LibreOffice Impress (Windows, macOS, and Linux) can export slides as images; FFmpeg can assemble those images into a WebM. This method produces static slides without presentation animations or transitions.

1. Open the PPT in Impress and use File → Export to export the slides as PNG images. If necessary, rename the files in slide order to slide-001.png, slide-002.png, and so on.
2. In a terminal in the image folder, run ffmpeg -framerate 1/5 -i slide-%03d.png -vf fps=30 -c:v libvpx-vp9 -pix_fmt yuv420p presentation.webm. This sets each slide to five seconds; change 1/5 to another reciprocal duration, such as 1/8 for eight seconds per slide.

Microsoft PowerPoint for Windows can render the deck, including its animations and timings, as an MP4. Choose File → Export → Create a Video, save as MP4, then convert it with FFmpeg: ffmpeg -i presentation.mp4 -c:v libvpx-vp9 -crf 32 -b:v 0 -c:a libopus presentation.webm. Adjusting -crf changes the video quality and file size; lower values generally produce higher quality and larger files.

Quality and compatibility

Slide timing determines the video duration. The image-sequence method uses a fixed duration per slide and discards motion, while exporting through PowerPoint can retain rendered transitions and animations. Inspect the WEBM in the intended browser or player, especially if it contains audio, because playback support depends on the player’s WebM codec support.