Compress PowerPoint Presentations — Online PPTX & ODP Compressor
Make a large .pptx or .odp file smaller right in your browser. Embedded images are downscaled and re-encoded, unreferenced files are removed, and the package is repacked at maximum compression — your slides, text, and layout stay exactly the same.
Key Features
Compress Slide Images
Downscale and re-encode the pictures inside your deck — the biggest contributor to a large presentation file.
Your Deck Stays Intact
Slide layouts, text, notes, and design remain exactly the same while the images get smaller.
Smart Package Repacking
Leftover files are removed and the whole package is re-zipped with maximum compression.
See the Savings Instantly
Every file shows its original and new size plus the percentage saved before you download.
100% Local & Private
Everything runs in your browser — your presentation never leaves your device.
Free & No Sign-Up
No account, no install, no watermark, and no limits.
About the PowerPoint Compressor
The PowerPoint compressor reduces the size of a .pptx or .odp file without ever uploading it. Most of a large presentation is made of pictures, so the compressor starts by downscaling and re-encoding the embedded JPEG and PNG images — big photos are shrunk to a sensible resolution and re-saved at an efficient quality. It then drops any leftover media files no part of the deck uses anymore, and finally repacks the whole package with maximum ZIP compression. Because every step preserves the original package structure, your slides, text, layouts, and notes stay exactly the same. When you are done, download each smaller file individually or export all of them as a single ZIP archive.
How to Compress PowerPoint Files
Compressing a presentation takes three simple steps:
Upload a Presentation
Drag and drop or browse for the .pptx or .odp file you want to compress.
Choose a Compression Level
Pick High quality, Balanced, or Maximum, then click Compress. Larger images and lower quality save more space.
Download the Smaller File
Check the new size and the percentage saved, then download each file or grab all of them as a ZIP archive.
Good to Know
Compression works mainly on the images inside a presentation, so photo-heavy .pptx and .odp decks shrink the most — often by half or more — while text-only presentations are already small and may not change much. JPEG and PNG images keep their original format and very small pictures are left untouched, so the output stays fully compatible with Microsoft PowerPoint, Google Slides, and LibreOffice Impress. Processing happens locally in your browser: nothing is uploaded, so there is no privacy concern and no file size limit beyond what your browser can handle.