Compress PowerPoint

Compress PowerPoint Online: Shrink a .pptx for Email

PowerPoint files balloon fast — a few phone photos, a couple of screenshots, an exported chart, and a .pptx is suddenly 40 MB and won't go through email. ConvertBrio's Compress PowerPoint tool opens the presentation, re-encodes the images inside it at an efficient quality and resolution, and hands back a smaller .pptx that's still fully editable.

It's free, runs in your browser with no signup, and adds no watermark. Your slide text, layout, animations, charts, and speaker notes are untouched — only the embedded photos and screenshots are re-encoded.

How to use this tool

1. 1

   Save the presentation as .pptx

   In PowerPoint, File → Save As → PowerPoint Presentation (.pptx). Legacy .ppt isn't supported.

2. 2

   Upload it

   Drag the .pptx into the box or browse for it. One file per run, up to 100 MB.

3. 3

   Compress

   ConvertBrio finds every embedded image, downsizes any that are larger than a slide can display, and re-encodes them. Text and vector content are left alone.

4. 4

   Download the smaller .pptx

   Open it in PowerPoint to confirm the slides still look right, then email or upload it.

Why PowerPoint files get so large

Modern phones shoot 12–48 megapixel photos — several megabytes each. Paste four of those across your slides and the deck carries ~20 MB of image data before a single word of text. PowerPoint keeps each image at the full resolution it was inserted at, even though the slide only ever shows a small version, so the fix is to re-encode those images at a size that matches how they're actually displayed.

What the tool changes, and what it doesn't

• Re-encoded: embedded JPEG and PNG images, downscaled if larger than ~1800px on the long side
• Untouched: all text, fonts, slide layout, animations, transitions, speaker notes
• Untouched: charts, tables, SmartArt, and vector shapes
• Untouched: EMF/WMF/SVG vector images and any format the tool doesn't recognise
• The file stays a normal, editable .pptx — nothing is flattened

How much smaller will it get?

It depends entirely on how image-heavy the deck is. A presentation built around full-resolution photos and screenshots often drops 40–70%. A mostly-text deck with a logo and a couple of small images won't change much — there's little to remove. If the result isn't small enough, the sections below cover deeper options.

For an even smaller file: convert to PDF

If the deck is finished and the recipient doesn't need to edit it, PowerPoint to PDF followed by Compress PDF usually produces the smallest file of all, and it opens on any device with no PowerPoint needed. The trade-off is that it's no longer an editable presentation.

Doing it inside PowerPoint instead

PowerPoint has its own version of this: select an image → Picture Format → Compress Pictures → untick "Apply only to this picture" → choose 150 ppi → tick "Delete cropped areas of pictures" → OK, then File → Save As. Useful if you can't upload the file, though it's more clicks than this tool.

Privacy and limits

Your presentation is encrypted in transit, processed automatically on ConvertBrio's servers with no human review, and both the upload and the compressed copy are deleted within 24 hours. One .pptx per run, up to 100 MB, free, no account, no watermark.

Related Tools

• PowerPoint to PDF
• Compress PDF
• Compress Word
• Compress Image