Convert PPT to PPTX

PPT to PPTX converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.

Conversions

Drop any file here or click to browse

All file types supported

About formats

PPT

PPT is the legacy presentation format used by Microsoft PowerPoint 97-2003, based on the Compound File Binary Format. PPT stores slides with formatted text, raster images, and multimedia in structured binary streams. Converting PPT files to modern PPTX, PDF, and image formats enables editing and viewing across all modern devices.

Developer: Microsoft
Initial release: 1997
Compression: Lossless
Color depth: up to 24-bit
Transparency: Yes
Animation: Yes

Best for

Legacy PowerPoint 97-2003 presentations
Archival slide deck compatibility
Opening older office documents
Extracting slide content from legacy files
Converting old presentations to modern formats

Pros

+Widely recognized legacy PowerPoint format
+Contains slide layouts, text, and embedded graphics
+Supported by older office software and viewers
+Easily converted to modern PPTX and PDF

Cons

−Proprietary binary format replaced by open XML
−Limited compatibility with modern web tools
−Prone to macro security vulnerabilities
−No native support for modern Office Open XML features

PPTX

PPTX is the Microsoft PowerPoint presentation format introduced with Office 2007, based on the Office Open XML standard. PPTX stores slides containing text, images, animations, transitions, master layouts and embedded media in a ZIP archive of XML parts. PPTX is the standard format for presentations and is supported by PowerPoint, LibreOffice Impress, Google Slides, and Apple Keynote.

Developer: Microsoft
Initial release: 2007
Compression: Lossless
Color depth: up to 32-bit
Transparency: Yes
Animation: Yes

Best for

Creating business presentations
Slide decks with animations and transitions
Collaborative presentation editing
Conference and lecture slides
Embedded-media-rich presentations

Pros

+Standard PowerPoint presentation format
+Stores text, images, animations, and transitions
+ZIP-based OOXML open standard
+Supported by PowerPoint, Google Slides, Keynote, and Impress

Cons

−Large files with embedded media
−Formatting can shift across suites
−Overkill for simple slide sharing
−Complex structure for programmatic parsing

How to convert PPT to PPTX

1
Select PPT files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.
2
Choose pptx — or any other format you need as a result (more than 200 formats supported).
3
Let the file convert, then download your pptx file right away.

PPT vs PPTX

Property	PPT	PPTX
Compression	Lossless	Lossless
Transparency	Yes	Yes
Animation	Yes	Yes
DRM support	Yes	Yes
Open format	No	Yes

When to use PPT vs PPTX

PPT

Legacy PowerPoint 97-2003 presentations
Archival slide deck compatibility
Opening older office documents
Extracting slide content from legacy files
Converting old presentations to modern formats

PPTX

Creating business presentations
Slide decks with animations and transitions
Collaborative presentation editing
Conference and lecture slides
Embedded-media-rich presentations

Use cases for PPT → PPTX

Legacy PowerPoint 97-2003 presentations
Archival slide deck compatibility
Opening older office documents
Extracting slide content from legacy files
Converting old presentations to modern formats
Creating business presentations
Slide decks with animations and transitions
Collaborative presentation editing
Conference and lecture slides
Embedded-media-rich presentations

Frequently Asked Questions

Is converting PPT to PPTX free?

Yes. This PPT → PPTX converter runs entirely in your browser and is completely free — no account, no credits, no watermark.

Which devices and platforms can I use to convert PPT to PPTX?

Any modern device with a current web browser: Windows, macOS, Linux, Android, iPhone and iPad. There is nothing to install — the conversion happens locally.

Are my PPT files uploaded to a server?

No. Files never leave your device. The entire PPT → PPTX conversion runs locally in your browser, so your data stays private.

Can I convert multiple PPT files at once?

Yes — batch conversion is supported. Add as many PPT files as you like and convert them to PPTX in one pass, then download the results together.

What is the maximum file size?

There is no fixed server-side limit because the conversion happens in your browser. Practical limits depend on the available memory and CPU of your device.

Will converting PPT to PPTX lose quality?

No. PPTX is a lossless format (or used in a lossless mode here), so the original data from your PPT file is preserved bit-for-bit in the converted result.

Will transparency be preserved when converting PPT to PPTX?

Yes. Both PPT and PPTX support alpha-channel transparency, so transparent areas of your file are kept unchanged in the PPTX output.

How will the file size change after converting PPT to PPTX?

Both formats use comparable compression, so the PPTX output will be similar in size to your PPT file — typically within 10–20% of each other.

Related Conversions

Specific converters

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

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