PPT を PPTX に変換

Free online PPT to PPTX converter. Fast, secure, no signup required.

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Accepted: PPT files · Max 100 MB per file

ppt pptx

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Need to convert PPT to PPTX? MegaConvert makes it easy. Upload your Microsoft PowerPoint Presentation (PPT) file and get a Microsoft PowerPoint Open XML Presentation (PPTX) file in seconds — no software to install, no signup required. Whether you need this conversion for business presentations / office work, our online converter handles it instantly. Free for files up to 25MB, with support for larger files up to 2GB.

How to Convert PPT to PPTX Online

1
Upload your PPT file
Click the upload area or drag and drop your PPT file. Files up to 25MB are free. Larger files are supported with pay-per-use.
2
Choose PPTX as output format
PPTX is automatically selected on this page. You can adjust conversion settings if needed.
3
Click Convert
Hit the Convert button to start processing. Your file will be converted using our high-performance servers.
4
Download your PPTX file
Once conversion is complete, click Download to save your new PPTX file. Free files are available for 1 hour.

Why Convert PPT to PPTX?

**Modernize your files** — PPT is an older format. Converting to PPTX ensures better compatibility with current software and devices.
**Better efficiency** — PPTX offers improved compression and quality compared to older formats, reducing file sizes while maintaining fidelity.
**Reduce file size** — Converting between formats can significantly reduce file size, making files easier to share via email or cloud storage.
**Software requirements** — Your software or platform may require PPTX format specifically. Converting ensures full compatibility.

PPT vs PPTX — Format Comparison

Feature	PPT	PPTX
Full Name	Microsoft PowerPoint Presentation	Microsoft PowerPoint Open XML Presentation
Developer	Microsoft	Microsoft
First Released	1987	2007
Category	Presentation	Presentation
Extension	.ppt	.pptx
MIME Type	application/vnd.ms-powerpoint	application/vnd.openxmlformats-officedocument.presentationml.presentation

Animations and transitions are lost when converting to PDF or images.

About PPT Format

Legacy Microsoft PowerPoint binary format for slide presentations.

Full name: Microsoft PowerPoint Presentation

Developer: Microsoft (1987)

About PPTX Format

Modern Microsoft PowerPoint format based on Open XML with ZIP compression.

Full name: Microsoft PowerPoint Open XML Presentation

Developer: Microsoft (2007)

よくある質問

Upload your PPT file to MegaConvert.io, select PPTX as the output format, and click Convert. Your converted file will be ready to download in seconds. No software installation required.

Yes! Files up to 25MB can be converted for free, up to 3 times per day. For larger files, pay-per-use pricing starts at just $2 for files up to 100MB.

Absolutely. All uploaded files are encrypted in transit (HTTPS), scanned for viruses, and automatically deleted after conversion. We never share or access your files.

Free users can convert files up to 25MB. Pay-per-use supports files up to 2GB. Subscribers get up to 2GB with priority processing.

Legacy Microsoft PowerPoint binary format for slide presentations. Developer: Microsoft (1987).

Modern Microsoft PowerPoint format based on Open XML with ZIP compression. Developer: Microsoft (2007).