PowerPoint Slimmer

About this tool

PowerPoint Slimmer looks inside a PowerPoint file and reports exactly what is making it big: full-resolution photos, embedded fonts, embedded objects, and media that no slide even uses any more. You choose what to shrink, and it rewrites the file in your browser.

When to use it

Reach for it when a deck is too large to email, when a presentation full of screenshots has grown to tens of megabytes, or when PowerPoint's own Compress Pictures command has not helped enough.

How to use it

1. Open a .pptx, .pptm, .potx or .potm file — nothing is uploaded.
2. Review the large elements and the estimated size after slimming, and adjust the downscale limit and JPEG quality if you want.
3. Tick what to optimize — or take the quick wins for unused media and embedded fonts — then download the slimmed copy.

Good to know

• Photos are downscaled and recompressed, and a PNG photo may be converted to JPEG. Images with transparency are treated more conservatively so they keep working.
• Vector metafiles (EMF and WMF) and GIFs are left as they are, and embedded objects cannot be shrunk safely in a browser.
• Removing embedded fonts makes the deck rely on the fonts installed on the reader's computer, so only do it if you know they have them.

Common questions

Will the slides still look the same?

At the default High quality and downscale limit the difference is normally invisible on screen and on a projector. Slimming is lossy, though, so keep your original — this tool never modifies it.

Why is my file still large afterwards?

If the biggest items are embedded objects, video or vector graphics, there is little left to compress. The report shows which elements dominate the size, so you can decide what to replace or remove in PowerPoint.

Is my presentation uploaded anywhere?

No. The file is opened, analysed and rewritten entirely by JavaScript in your own browser, and never leaves your device.