Free online PPTM to WEBP converter

Web pages and image-based apps often need slide artwork as individual WEBP images rather than as an editable presentation. Converting a PPTM makes each selected slide a raster image that can be placed or shared without requiring PowerPoint.

What the PPTM format is

PPTM is the macro-enabled Microsoft PowerPoint Open XML presentation format. It stores slides, media, and presentation content in a package that can also contain VBA macros; Microsoft PowerPoint creates it, and LibreOffice Impress can open it. The format is used for presentations that include macros or are saved in PowerPoint’s macro-enabled format.

What the WEBP format is

WEBP is a raster image format used widely on the web. It supports lossy and lossless compression and transparency, and can produce smaller files than comparable PNG or JPEG images at similar visual quality. Choose it when a website or application accepts WEBP images; a converted slide is an image, not an editable presentation.

How to convert PPTM to WEBP

Online on 101convert.com

1. Upload the PPTM file to the converter on this page. You can add several files for batch conversion; the per-file size limit is shown on the page.
2. Before converting, set any needed options: pages, resolution, quality, image size, max width, max height, auto orient, or strip metadata.
3. Convert the files and download the resulting WEBP images. The conversion runs on the server with LibreOffice, then ImageMagick.

Offline with desktop software

LibreOffice Impress and ImageMagick are free options for Windows, macOS, and Linux. In Impress, open the PPTM and use File → Export As → Export as PDF to export the slides. Then use ImageMagick’s command-line tool to rasterize the PDF pages as numbered WEBP files:

magick -density 150 presentation.pdf -quality 85 slide-%03d.webp

Run the command in the folder containing presentation.pdf; %03d produces numbered files such as slide-000.webp. Adjust the density to change output dimensions and the quality value to change lossy compression. ImageMagick must have PDF reading support enabled.

Quality and limitations

Each slide becomes a separate, flattened image: text and shapes are no longer individually editable, and PPTM macros are not included in WEBP output. Higher rasterization resolution preserves fine details but increases image dimensions and file size; lowering WEBP quality can reduce size while introducing lossy artifacts.