What is the difference between PPT and PPTX?

PPT is the legacy binary format used by PowerPoint 97-2003. PPTX is the modern XML-based format introduced with PowerPoint 2007. PPTX files are significantly smaller (up to 75%), more secure (they cannot contain macros by default), and compatible with all modern presentation software including Google Slides and Keynote.

Can I convert PPT to PPTX without Microsoft PowerPoint?

Yes! Our online converter works entirely in your browser. You don't need PowerPoint, Microsoft Office, or any desktop software installed. Simply upload your PPT file and download the converted PPTX.

Will my animations and transitions be preserved?

Yes, all animations, transitions, timing, and effects from your original PPT file are preserved during conversion to PPTX. The converted file maintains all visual effects exactly as they were.

Is there a file size limit for conversion?

Our converter handles PPT files up to 100MB, which covers the vast majority of presentations. Most PPT files are well under this limit.

Why should I convert my PPT files to PPTX?

There are several benefits: PPTX files are up to 75% smaller, they're compatible with modern software like Google Slides and Keynote, they offer better security (no hidden macros), and they support modern PowerPoint features like SmartArt, better charts, and improved media handling.

Is this converter free to use?

Yes, our PPT to PPTX converter is completely free. There's no registration required, no watermarks added, no daily limits, and no hidden fees. Convert as many files as you need.

What operating systems and browsers are supported?

Our converter works on any modern browser including Chrome, Firefox, Safari, and Edge. It runs on Windows, macOS, Linux, and Chromebooks. You can even convert files on your phone or tablet.

Are my files secure during conversion?

Absolutely. Your files are transmitted securely via HTTPS, processed on our servers, and automatically deleted after conversion. We never store, share, or access the content of your presentations.

Convert PPT to PPTX Online Free - No Software Needed

Convert Old PowerPoint Files to Modern PPTX Format

Still have presentations saved in the legacy .ppt format from PowerPoint 97-2003? Our free online PPT to PPTX converter transforms them into the modern .pptx format used by PowerPoint 2007 and later. PPTX files are up to 75% smaller, more secure, and compatible with Google Slides, Keynote, and all modern presentation software.

Simply upload your .ppt file and our converter handles the rest. All slides, images, charts, animations, transitions, and formatting are preserved during conversion. The converted .pptx file is ready to edit, share, and present. No need to install Microsoft Office or any desktop software — everything runs in your browser.

How It Works

How to Convert PPT to PPTX

Convert your old PowerPoint files in three simple steps. No technical knowledge required.

Upload Your PPT File

Drag and drop your .ppt file or click to browse. Our tool accepts all PowerPoint 97-2003 format files. No file size limits.

Automatic Conversion

Our converter processes your file instantly, transforming it from the legacy PPT format to modern PPTX. All content, formatting, animations, and media are preserved.

Download Your PPTX

Download your converted presentation in the modern .pptx format. Open it in PowerPoint, Google Slides, Keynote, or any compatible software.

Features

Why Convert PPT to PPTX with SlideSpeak?

Our free converter offers everything you need to modernize your old PowerPoint files.

Works Everywhere

PPTX files are compatible with PowerPoint 2007+, Google Slides, Keynote, LibreOffice, and all modern presentation software. Convert once, open anywhere.

Smaller File Sizes

PPTX uses XML-based compression, producing files up to 75% smaller than the legacy PPT format. Easier to email, share, and store in the cloud.

Instant Conversion

Upload your PPT file and get a converted PPTX in seconds. No waiting, no queues, no daily conversion limits. Convert as many files as you need.

All Content Preserved

Every slide, image, chart, animation, transition, font, and layout from your original PPT file is faithfully preserved in the converted PPTX.

Secure & Private

Your files are processed securely and automatically deleted after conversion. We never store, share, or access your presentation content.

No Installation Required

Convert PPT to PPTX directly in your browser. No need to install PowerPoint, Office, or any software. Works on Windows, Mac, Linux, and Chromebooks.

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PPT to PPTX Conversion

Frequently Asked Questions

Everything you need to know about converting PPT files to the modern PPTX format.

Convert PPT to PPTX Online for Free