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PPTX to PPT Converter

Convert PPTX to PPT online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

  • Free to use
  • No file stored beyond 1 hour
  • Encrypted over TLS 1.2/1.3
  • No watermarks

Drag and drop your files here or click to upload.

Maximum file size is 1GB

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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.

  1. 01

    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.

  2. 02

    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.

  3. 03

    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.

PPTX to PPT

Why convert PPTX to PPT?

PPTX and PPT are both presentation formats: PPTX is best for slides you want to keep editing, PPT for older PowerPoint files (before 2007).

  • Where PPT works best

    Older PowerPoint files (before 2007).

PPTX vs PPT: what's the difference?

PropertyPPTXPPT
TypePresentationPresentation
EditableYesYes
Opens inPowerPoint, Google Slides, Keynote and LibreOfficePowerPoint and most presentation apps
Best forSlides you want to keep editingOlder PowerPoint files (before 2007)

What is a PPTX file?

PowerPoint Open XML Presentation

Developed By
Microsoft
Initial Release
2007
MIME Type
application/vnd.openxmlformats-officedocument.presentationml.presentation

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.

What is a PPT file?

PowerPoint Presentation (Legacy Binary)

Developed By
Microsoft
Initial Release
1987
MIME Type
application/vnd.ms-powerpoint

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.

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

  • Convert PPTX to PPT in seconds

    Every PPTX to PPT 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 PPTX to PPT via API

Automate PPTX to PPT conversions in three steps: create a job, upload your file, then poll for the result.

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.

# 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": "pptx-to-ppt",
    "tasks": {
      "upload-file": {
        "operation": "import/direct/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "input_format": "pptx",
        "output_format": "ppt"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (upload_url of the upload-file task in the response)
curl -X PUT "$UPLOAD_URL&filename=input.pptx" --upload-file input.pptx

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

FAQ

Frequently asked questions

Common questions about converting PPTX to PPT with RunConvert.

Upload your .pptx file, select PPT as the output format, and click Convert. This is useful for opening the presentation in older versions of PowerPoint.

Basic animations and transitions are generally preserved, though some newer PowerPoint effects available only in PPTX may not carry over to the older format.

Ready to convert PPTX to PPT?

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