Free productivity tool
Make your PowerPoint smaller in seconds
Shrink a .pptx that’s too big to email, upload or share. It runs in your browser, and your file never leaves your device.
Most oversized decks are big because of full-resolution photos and screenshots, often 4,000+ pixels wide when a projector shows 1,920. This tool resizes those pictures to the size your slides need and re-saves them efficiently. Text, notes, animations and layouts stay exactly the same.
- 1
Drop in your deckChoose a .pptx, .ppsx, .potx or .pptm file from your device.
- 2
Choose a presetEmail for the smallest file, Balanced for screens, Print for sharp detail.
- 3
Download the smaller fileSee the before and after, then save the new copy. Your original stays untouched.
Understanding the math
A .pptx file is really a zip folder. Inside are small text files for your slides, notes and layouts, plus a media folder holding every picture at the size it was inserted. PowerPoint keeps the full original even when the picture is shown in a small box, so one phone photo can add 3 to 6 MB. Pictures are almost always what makes a deck heavy, which is why this tool focuses on them.
What the tool does, in order
For each PNG or JPEG in the deck, the tool first reads the picture’s width and height. If the longest side is bigger than your Max image size, both sides are multiplied by the same factor (Max image size ÷ longest side, rounded to whole pixels), so the shape never changes. Next, the picture is saved again: JPEGs at your JPEG quality, and PNGs with no see-through areas as JPEG too (when that box is ticked). PNGs with transparency stay PNG. Finally, the new picture is used only if it is at least 5% smaller than the original; otherwise the original is kept. Everything else in the file is copied over unchanged, and the folder is zipped back into a new .pptx.
Worked example (Balanced preset)
A typical phone photo is 4032 × 3024 pixels. With Balanced, Max image size is 1920, so the factor is 1920 ÷ 4032 (about 0.476). The new width is 4032 × 0.476… = 1920 and the new height is 3024 × 0.476… = 1440 pixels, which the image details table shows as “4032×3024 → 1920×1440”.
That is 2,764,800 pixels instead of 12,192,768, or 77% fewer pixels to store. After re-saving at quality 80, a photo like this often drops from several MB to a few hundred KB. The exact number depends on the picture: busy, detailed photos stay larger than plain backgrounds.
What it doesn’t change
- Video and audio. Use PowerPoint’s Compress Media option, or link to an online video instead.
- Embedded fonts and files, such as Excel charts or PDFs placed in the deck.
- Vector graphics (shapes, icons, SVG, EMF), which are already small.
- Cropped-away areas. Use PowerPoint’s “Delete cropped areas of pictures” option to remove them.
Pixels you remove can’t be added back, so the tool always gives you a new copy and leaves your original alone. If you’d like help with the bigger questions in your family’s life, you can request an appointment with NeoPenn Life Strategies LLC.
Frequently asked questions
Is my presentation uploaded anywhere?
No. The file is opened and rebuilt by your own browser using built-in features. Nothing is uploaded, saved or sent to NeoPenn Life Strategies LLC or anyone else, and the page has no database. You can even disconnect from the internet after the page loads and the tool still works. Your original file on your device is never changed; you get a new copy.
Will my slides look worse on a projector or TV?
With the Balanced preset, images are kept up to 1920 pixels on their longest side, which matches a full HD (1080p) projector or TV, so most people see no difference. If you print slides or zoom into photos, use the Print quality preset (2560 pixels, quality 88). Email shrinks the most and is best for sharing and reading on screens.
Why didn’t my file get much smaller?
This tool shrinks photos and screenshots only. If most of the file is video or audio, embedded fonts or embedded spreadsheets, those parts stay the same size, and the results panel shows how much of your file they take up. Decks whose pictures are already compressed may also see small savings. Each image is replaced only when the new version is at least 5% smaller.
Will my animations, notes and transitions still work?
Yes. Slide text, layouts, speaker notes, animations, transitions, charts and links are copied over exactly as they were. Only the picture files inside the deck are re-saved at a smaller size. Cropping still works too, because PowerPoint stores crops as percentages of the image. As with any tool, open the new file and flip through it once before you send it.
Does it work with .ppt, Keynote or Google Slides files?
It works with modern PowerPoint files: .pptx, plus .ppsx (slide shows), .potx (templates) and .pptm. For an older .ppt file, open it in PowerPoint and save it as .pptx first. From Google Slides or Keynote, download or export the deck as a .pptx, then compress it here.
Is there a file size limit, and does it work on a phone?
There is no set limit, but very large decks (several hundred MB) depend on your device’s memory, so a laptop or desktop works best for those. The tool runs in current versions of Chrome, Edge, Safari and Firefox, including on phones and tablets, where you can pick a file from your Files app or cloud drive.