Short Version
A new PDF compression feature is coming to SharePoint and OneDrive to reduce the file sizes of PDFs. You will be able to choose from three compression levels. Due early to mid-May 2025.
Details
Microsoft: “We offer three levels of image compression. All use lossy compression and chroma subsampling to reduce file sizes while maintaining visual quality”. Choose from:
- Light: Apply 4:2:0 colour subsampling and reduce 25% of image pixels.
- Medium: Apply 4:2:0 colour subsampling and reduce 50% of image pixels.
- Heavy: Apply 4:2:0 colour subsampling and reduce 75% of image pixels.
To compress PDF files:
1. Open a PDF in OneDrive for the web (in SharePoint, go to the document library and choose Preview):
2. Select the Compress button at the top of the screen:
3. Select a compression level and then select Save a copy to save the compressed file:
A progress notification will appear at the bottom of the screen. After the compression is complete, select Open from the notification to view the compressed file:
The original file must be smaller than 300 MB.
Availability
Early to mid-May 2025.
Source, related links, and references
MC1061109 .
365 Roadmap ID 487440.
Image(s): Microsoft.
Page originally published
5th May 2025 and kept up to date.
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