Compress PowerPoint Files Online
Reduce PPTX file sizes by re-compressing images and optimizing structure. Perfect for email attachments and sharing.
Drop a PPTX file here or click to browse
PowerPoint (.pptx) files up to 100 MB
Re-compress ZIP structure and embedded images
Three compression levels to choose from
100% client-side — files never leave your device
No file size limits for compression
Instant download of compressed files
No watermarks, no sign-up required
Frequently Asked Questions
How does PPTX compression work?
PPTX files are ZIP archives containing XML, images, and other media. Compresso re-compresses the ZIP with optimal settings and can also compress embedded images to significantly reduce file size.
How much can I reduce my PPTX file size?
Results depend on your presentation's content. Presentations with many images can see 30–70% size reduction. Text-heavy slides with few images will see smaller reductions.
What's the difference between compression levels?
Low compression re-zips with better compression settings only. Medium also compresses embedded images at 75% JPEG quality. High uses aggressive 55% JPEG quality and strips document metadata.
Will compression affect my slides' quality?
Low compression preserves everything perfectly. Medium and high compression convert embedded images to JPEG, which may slightly reduce image quality but significantly reduces file size.
Is it safe to compress PPTX files with Compresso?
Absolutely. Compresso processes everything in your browser — your files are never uploaded to any server. Your presentations stay completely private on your device.