Compress PowerPoint for Email
Shrink the pictures inside a .pptx so the deck fits an email limit. Every slide, font and animation stays as it was.
Target: 25.00 MB
What this page is for
A deck bounces from email almost always because of the pictures inside it: phone photos pasted at full resolution, and screenshots saved as large PNGs. This page opens the .pptx in your browser, re-encodes those pictures smaller, and gives you a .pptx back.
It does the same job as the Compress Pictures command in desktop PowerPoint, but works on a phone and does every picture at once.
The rule: email limits count the whole message
Gmail allows 25 MB per message, measured after encoding, so a deck much over 18 MB usually becomes a Drive link. Outlook.com states 20 MB. Work Exchange accounts default to 10 MB unless your administrator changed it.
A .pptx is a ZIP archive. Pictures live in its media folder. This page keeps every file name and file type the same, so PowerPoint, Keynote and Google Slides open the result normally. Embedded video and audio are left alone and reported, because shrinking those properly needs a video encoder pass of its own.
Worked example
38 MB sales deck with 42 photos. At a longest side of 1920 px and JPEG quality 75, photos taken on a phone typically drop to a quarter of their size.
A deck like that usually comes out between 10 and 15 MB, under the Outlook.com limit. If it has a video in it, the page tells you how much of the size that video accounts for.
How to use it
- Pick your email limit.
- Tap Choose file and select the .pptx.
- Tap Shrink the deck.
- Check the result line: it says how many pictures changed and whether any video was left alone.
- Download the smaller .pptx and attach it.
Questions
Will my slides change?
Text, layout, fonts, animations and notes are untouched. Pictures are the only thing re-encoded, and only when the new version is smaller.
Does it work with old .ppt files?
No. The old binary format is not a ZIP. Open it in PowerPoint and save as .pptx first.
What about videos inside the deck?
They are left as they are and reported. Compress the video on the MP4 page, put it back into the deck, then run this again.
Do PNG screenshots lose transparency?
No. PNGs stay PNGs. They are only scaled down, which keeps transparency.
Is my presentation uploaded?
No. The file is opened and rewritten in your browser.
Related tools
Sizes and results are estimates produced by your own browser. A file that fits the cap is not a guarantee that the destination will accept it: services change their limits, and some check more than size. On iPhone and iPad, Safari limits memory and codecs, so large files can fail there that work on a computer. Keep your original file.