Three steps. That's it.
Modernize legacy PowerPoint files in seconds. No technical knowledge required.
Upload your PPT
Drag and drop your .ppt file or click to browse. Files up to 100 MB.
Convert
Our engine reads the legacy binary format and rebuilds it as a modern XML-based .pptx.
Download PPTX
Your modern .pptx file is ready in seconds. One click to download.
Built for accuracy, speed & security
Convert PPT to PPTX Online
Our converter rebuilds the legacy binary format into a modern XML-based .pptx file while preserving slides, images, charts, fonts, and layouts so the result looks just like the original.
FREE & No Sign-up Required
Our PPT to PPTX converter is 100% free with no account required. Upload your file and download the modern .pptx presentation instantly — no daily limits, no watermarks.
Safe and secure processing
At SlideSpeak, we prioritize data security and privacy above all else. We ensure that every PowerPoint file you upload is stored with top-notch encryption and automatically deleted after processing.
Why choose SlideSpeak?
Modern PPTX Format
Our converter produces a true native .pptx file fully compatible with PowerPoint 2007+, Google Slides, Keynote, and LibreOffice. Convert once, open anywhere.
Maintain Visual Quality
Slides, images, charts, fonts, and layouts from your original .ppt file are faithfully preserved in the modern .pptx output.
Free to Use
Our PPT to PPTX converter is completely free with no daily limits, no watermarks, and no hidden fees.
Fast Processing
Most files convert in seconds. No queues, no waiting room, no per-conversion fees.
Secure and Private
Your PowerPoint files are handled with the utmost security and privacy. Files are encrypted in transit and permanently deleted after conversion.
No Software Needed
Convert PPT to PPTX directly in your browser. No PowerPoint, no Office license, no desktop install required.
Blazing fast, even for large files
Most PowerPoint files convert in under 30 seconds. Our server-side engine works in parallel — parsing slides, rebuilding the XML structure, and packaging the output simultaneously.
<30s
Avg. conversion time
100%
Layout accuracy
500+
Slides supported
60K+
Files converted
How we stack up
See why SlideSpeak is the simplest way to modernize legacy PowerPoint files.
| Features |  | Microsoft PowerPoint | CloudConvert | Convertio |
|---|---|---|---|---|
| Free conversions | Unlimited | License required | 10/day | Limited |
| Sign-up required | No signup | License | No signup | No signup |
| Browser-based (no install) | Yes | Desktop app | Yes | Yes |
| Max file size (free) | 100 MB | No limit | Credit-based | 100 MB |
| Price | Free | Paid | Freemium | Freemium |
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Frequently Asked Questions
Everything you need to know about converting PPT files to the modern PPTX format.
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