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PowerPoint Compressor

Shrink presentations full of photos so they fit in an email or an upload form, without changing the slides.

Runs in your browser · No uploads

Drag & drop PowerPoint files here

or

PPTX, PPTM, PPSX or POTX · one or many (not the old .ppt format)

Your files stay on your device. Nothing is uploaded.

Pictures are made smaller; videos, sounds and embedded fonts are copied unchanged. Your original files are not changed.

  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to compress a PowerPoint

  1. Choose one or more presentations (.pptx, .pptm, .ppsx or .potx).
  2. Pick the picture quality: Recommended suits screens and projectors.
  3. Press Compress, check the new size and download.

How it works

  • Each picture is measured where it is shown largest on a slide (cropping included) and scaled to what that size needs: 330, 220 or 150 pixels per inch depending on the quality you choose.
  • Photos are saved again as JPEG. Pictures with transparency stay PNG. At Recommended and Smallest, PNG photos without transparency become JPEG, which is usually much smaller; BMP pictures become PNG or JPEG.
  • A picture is only replaced when the new version is at least 10% smaller. If the whole file doesn't get smaller, you are told so and your original is offered unchanged.
  • Identical pictures, videos and sounds stored twice are kept once, and parts that no slide uses are removed (both can be turned off).
  • Slides, text, charts, animations, transitions, notes and macros are copied unchanged. Every new file passes a structure check before it is offered.

What it doesn't change

  • Videos and sounds: they often make up most of a large file. Compress them with the Video Compressor or the Audio Converter, then insert the smaller files in PowerPoint.
  • Embedded fonts and embedded files (spreadsheets, documents).
  • GIFs (they may be animated), vector pictures (SVG, EMF, WMF), TIFF and HD Photo pictures, CMYK JPEGs and JPEGs with a rotation flag, and pictures used as tiled fills.
  • The hidden, cropped-away parts of pictures are kept, so you can still undo a crop in PowerPoint.

Your presentation stays on your device

The file is read and changed in your browser. Nothing is uploaded, and this site's security policy blocks the page from sending files anywhere.

Frequently asked questions

Will my slides look different?

Pictures are re-saved at a lower quality and, when they have more pixels than the slide can show, made smaller. With Recommended this is hard to see on screens and projectors. Choose High quality for printing.

Why didn't my file get much smaller?

Most of its size is probably in videos, sounds or embedded fonts, which this tool doesn't change, or its pictures are already compressed. The PowerPoint Inspector shows what takes the space.

Can I use an old .ppt file?

No. The old PowerPoint 97–2003 format (.ppt) is a different kind of file. Open it in PowerPoint, Keynote, Google Slides or LibreOffice Impress, save it as .pptx, then use that file. To just look at a .ppt, use the PowerPoint Viewer.

Is there a size limit?

No server-imposed file size limits. Very large presentations need more memory and time on your device; a computer copes better than a phone.

Is my presentation uploaded?

No. Everything happens in your browser, on your device.