Compress PowerPoint
Make a presentation smaller by re-saving its pictures, with real sizes shown
Drop a PowerPoint fileTap to choose a PowerPoint file
or click to browseor tap to choose
Make it smaller by re-saving its pictures, in your browser
Large files (over 50 MB) may take longer or run out of browser memory
About Compress PowerPoint
Makes a PowerPoint presentation (.pptx) smaller by re-saving the pictures inside it. Most of a deck's size is its photos, and they are often stored far bigger than they are shown. There are three levels, Default, Medium and Strong, or you can give a target size such as "under 10 MB" for an email limit. Every level is a complete file with its real size shown, so you pick the one that still looks right. Nothing on the slides changes: the same text, layout, notes and animations, with pictures of lower quality.
Photos shrink a lot; text, charts and shapes are not pictures and do not shrink. EMF, WMF and SVG pictures, GIFs, video and audio are left exactly as they are, so a deck that is mostly video will not get much smaller. A PNG with see-through areas stays a PNG, so transparency is kept; a photograph saved as an opaque PNG may become a JPEG on Medium and Strong. WebP is not used because PowerPoint does not support it. Strong lowers picture quality visibly on large screens. The optional removals (stored preview picture, speaker notes, unused layouts) change what is in the file, so they are off until you tick them. Old .ppt files: open them in PowerPoint and save as .pptx first.
- How does it make the file smaller?
- By re-saving the JPEG and PNG pictures inside the deck at a lower quality and, where a picture is stored with far more pixels than it is shown with on its slide, at a lower resolution. Most of a presentation’s size is its photos, so this is where the savings are. Text, shapes and charts are not pictures and do not shrink.
- What do Default, Medium and Strong mean?
- Default re-saves pictures at good quality and no more than 220 dots per inch for the size they are shown. Medium uses lower quality and 150 dots per inch, and Strong lower still at 110. You see the real size of all three files and can download any of them. Target size instead gives the sharpest version that is at or under a limit you type, such as 10 MB, and tells you if even the smallest result is over it.
- Will it change my slides or remove transparency?
- It never changes the slide itself: the same text, layout, notes, animations and picture frames, with pictures of lower quality. A PNG that has see-through areas stays a PNG, so transparency is kept; it is only made smaller by reducing its pixel size. A photograph saved as an opaque PNG can become a JPEG on Medium and Strong when that is much smaller. WebP is not used because PowerPoint does not support it.
- What does it leave alone?
- EMF, WMF and SVG pictures, GIFs, video and audio are left exactly as they are, and the tool lists them before you start. A picture stored sideways, one that uses a transparent-colour effect, and one that would not get smaller are also left alone. A deck that is mostly video will not get much smaller.
- What are the optional removals?
- Three boxes that are off unless you tick them: the small preview picture stored in the file, the speaker notes, and layouts that no slide uses. They change what is in the file, so they are never done for you. Comments, hidden slides and author names are not touched here; Clean PowerPoint for Sharing handles those.
How to use Compress PowerPoint
Drop a .pptx file. The tool lists how many JPEG and PNG pictures it found, how much of the file they take, and which kinds of media it will leave exactly as they are. Choose Levels, which gives Default, Medium and Strong, or Target size and a limit such as 10 MB. Optionally lower the resolution cap, or tick one of the removals (stored preview picture, speaker notes, unused layouts), which are off until you choose them. Press Compress. A table shows the real size of every level, how many pictures were re-saved, and a Download button for each, with a preview of the chosen one next to the original.
When to use it
Useful when a deck is too big to email or to upload to a portal with a size limit, when a deck full of phone photos is slow to open, or before you store or share a presentation that will never need its pictures at full size. Target size is the quickest way to hit a limit such as 10 MB.
When not to use it
If the size is mostly video or audio, this tool cannot help, because it leaves them as they are. If the pictures must stay at full quality, for example a deck that will be printed large, do not use Strong. To remove notes, comments and author names, use Clean PowerPoint for Sharing; to cut the deck into parts, use Split PowerPoint.
Tips for best results
Compare the preview of the level you like with the original, looking at the photos at full size. Try Default first; if it is already under your limit there is no reason to go further. Compress after you have merged and organized, so the pictures are re-saved once. If a level makes a file that is not smaller, the tool says so and keeps the original pictures.
Limitations
Only JPEG and PNG (and BMP) pictures are re-saved. EMF, WMF and SVG pictures, GIFs, TIFFs, video and audio are left untouched, as are pictures stored sideways, pictures with a transparent-colour effect and pictures that do not get smaller. Pictures with see-through areas stay PNG, and WebP is never used because PowerPoint does not support it. PNG files are not palette-reduced. Quality loss is real: Strong is visibly softer on a large screen. Sizes shown are those of the files made, and a deck with few pictures will not shrink much.
Privacy
The file is opened and every picture is re-saved inside your browser tab using the browser’s own image tools, so the presentation is not uploaded. A request that counts the use goes to this site when you download and carries no part of your file.
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