PPT to PPTX Converter
Convert PPT to PPTX online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
How it works
Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
Upload your file
Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.
Choose an output format
Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.
Convert & download
Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.
What is a PPT file?
The PPT format is the legacy binary file standard used by Microsoft PowerPoint from versions 97 through 2003. It utilizes the Compound File Binary Format (CFBF), a structured storage container that organizes data into streams and storages, functioning primarily as a file system within a file. PPT files store presentation data-including text, embedded images, audio, and formatting-in binary records rather than XML, which results in larger file sizes and higher corruption risks compared to the modern OOXML standard.
How to open a PPT file
Modern versions of Microsoft PowerPoint retain backward compatibility for opening and saving PPT files. Native support is also available in macOS via Keynote and in Linux distributions via LibreOffice Impress or OpenOffice Impress. Google Slides provides cloud-based rendering of PPT files, though complex formatting or legacy OLE objects may require conversion to the newer Google Slides format for full editing capabilities.
PPT Technical Info
- Full Name
- PowerPoint Presentation (Legacy Binary)
- Developed By
- Microsoft
- Initial Release
- 1987
- MIME Type
- application/vnd.ms-powerpoint
What is a PPTX file?
The PPTX format is the default XML-based presentation file type for Microsoft PowerPoint 2007 and later, standardized as ECMA-376 and ISO/IEC 29500 (Office Open XML). It replaces the binary PPT format by using a ZIP-compressed directory structure containing separate XML files for slide data, themes, and metadata, alongside folders for embedded media. This modular architecture reduces file size via deflate compression and improves data recovery, as undamaged components remain accessible even if specific XML parts are corrupted.
How to open a PPTX file
PPTX is natively supported by all Microsoft PowerPoint versions from 2007 onwards on Windows, macOS, iOS, and Android. It has broad cross-platform support, with full editing capabilities available in Apple Keynote, Google Slides, and LibreOffice Impress. Because it is a ZIP archive, users can also rename the extension to .zip to manually extract embedded media assets without specialized software.
PPTX Technical Info
- Full Name
- PowerPoint Open XML Presentation
- Developed By
- Microsoft
- Initial Release
- 2007
- MIME Type
- application/vnd.openxmlformats-officedocument.presentationml.presentation
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Why RunConvert
The fastest way to convert any file
Purpose-built for speed, privacy, and breadth of format support.
Convert PPT to PPTX in seconds
Every PPT to PPTX conversion runs on our servers, so your device stays fast and the output quality stays intact.
Fast, cloud-powered
No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
Secure & private
Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
Free - no account needed
Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.
Developer API
Convert PPT to PPTX via API
Automate PPT to PPTX conversions in three steps: create a job, upload your file, then poll for the result.
# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"tag": "ppt-to-pptx",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "pptx"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.ppt
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
-H "Authorization: Bearer YOUR_API_KEY"Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.
FAQ
Frequently asked questions
Common questions about converting PPT to PPTX with RunConvert.
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