How To Compress PowerPoint (PPT Or PPTX) Online?

To choose a good PowerPoint to PDF converter, you need to pay attention to a few details. One option on Format PDF is converting from PowerPoint to PDF first. That lets you compress the file, then convert it back to PowerPoint as a final step. It sounds like a few extra moves, but each step only takes a few seconds, and the whole process is done in a few minutes.

1. Open PowerPoint to PDF.
2. Place your PPT or PPTX file in the upload box.
3. Click "Convert to PDF" and the file will download automatically.
4. Open Compress PDF.
5. Upload the PDF you just converted.
6. Choose between Extreme, Recommended, or Low Compression, depending on how much size you need to cut.
7. Click "Compress PDF" and the smaller file downloads within seconds.

Once you have the compressed PDF, convert it back to a presentation:

1. Open PDF to PowerPoint.
2. Upload the compressed PDF from the previous step.
3. Click "Convert to PowerPoint."
4. The finished file downloads immediately.

What To Keep In Mind With This Method

In this conversion process, there are a few points worth knowing so the result is exactly what you expect.

• Content stays the same. Converting to PDF and back doesn't add, remove, or reword anything in your slides. You're changing the container the content sits in, not the content itself.
• Nothing is stored. Files exist on the server only for the time it takes to process them, then they're removed.
• Processing time depends on the file. A slide deck heavy with high-resolution images or embedded video will take longer than a text-only presentation.
• Compression level affects image quality. If your presentation is mostly images, Extreme compression will visibly soften them, while Low compression keeps them closer to the original. If you're not sure, start with Recommended and adjust from there.
• This method works best when images are the problem. Most oversized PowerPoint files are bloated by unscaled photos and screenshots pasted in at full resolution. Converting to PDF and compressing targets exactly that.

Other Ways To Compress A PowerPoint File

Once you know the online method above, it helps to know what's actually happening on your own computer if you'd rather not convert formats at all.

Using PowerPoint's Built-In Compression (Windows And Mac)

Microsoft PowerPoint has a media compression feature built directly into the app, and it's usually the fastest fix if your file is large because of pictures:

1. Open your presentation in PowerPoint.
2. Click any image, then go to the "Picture Format" tab.
3. Select "Compress Pictures."
4. Choose a resolution (Web, 220 ppi is a safe default for on-screen sharing) and whether to apply it to all pictures or just the selected one.
5. Save the file as normal.

This directly shrinks the embedded images, which is where most of a PowerPoint file's size actually comes from.

Why Zipping A PPTX File Usually Doesn't Help

A .pptx file is already a compressed archive internally. Wrapping it in a ZIP or RAR file with a tool like 7-Zip or WinRAR typically saves very little extra space, sometimes only a few percent, because you'd be compressing something that's already compressed. It also adds an extra step for whoever receives it, since they'd need to extract the archive before they can open the presentation. If you need a smaller file to send, compressing the images inside the file, either through PowerPoint directly or by converting to PDF and back as above, will get you a meaningfully smaller result. Archiving is more useful when you're bundling several separate files together, not for shrinking one presentation on its own.

On Mobile Or Tablet

PowerPoint's compression settings aren't available in the mobile app, so if you need to compress a presentation from your phone or tablet, converting through the browser using the method at the top of this article is the more reliable option. Open Format PDF in your mobile browser and follow the same three steps: convert, compress, convert back.

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