PPT vs PPTX — Comparison & Free Converter
Fast, instant PPT to PPTX conversion. No signup required. Just drop your .ppt file and get .pptx in seconds.
Batch Settings
Some metadata may not survive
Your PPT file may contain OLE properties metadata. PPTX has limited or no support for these metadata types. Location data (GPS), camera settings, and color profiles may be stripped during conversion.
長年使い慣れたPowerPointのプレゼンテーション、いまだに「.ppt」形式で保存されていませんか？ビジネスの現場ではもちろん、同人イベントでの発表資料や、学校の授業で配布される資料など、様々な場面でPowerPointは活用されています。しかし、古い「.ppt」形式は、最新の「.pptx」形式と比べて機能面で制約があったり、互換性の問題で予期せぬレイアウト崩れを起こしたりする可能性も。特に、美しいフォントや複雑なアニメーション、縦書きテキストの表現にこだわる日本では、表示のずれは致命的になりかねません。この変換ツールは、大切なプレゼンテーションの魅力を損なうことなく、最新の環境でスムーズに表示・編集できるようお手伝いします。シンプルな操作で、あなたの「.ppt」ファイルを「.pptx」へと生まれ変わらせましょう。
- ビジネス資料の互換性向上
- 同人イベントでの発表資料表示
- 縦書きを含む資料のレイアウト保持
日本では、明朝体やゴシック体などフォントへのこだわりが強く、また縦書きの資料も多いため、PPTからPPTXへの変換時に文字化けやレイアウト崩れが発生しないか特に注意が必要です。
About PPT to PPTX Conversion
PPT or PPTX — which format should you use? The answer depends on your needs. Here's a quick breakdown.
PPT is the legacy PowerPoint format (pre-2007). It has universal platform support. PPTX is Microsoft PowerPoint's modern format for slide presentations. It has universal platform support.
Full Name: PPT uses Microsoft PowerPoint Legacy, while PPTX uses Microsoft PowerPoint. Compression: PPT uses None (uncompressed), while PPTX uses Lossless. Typical File Size: PPT uses 1–50 MB, while PPTX uses 1–50 MB.
So when should you convert PPT to PPTX? This conversion is ideal when you You need maximum device and software compatibility. This conversion helps you upgrade to a modern format.
Converting PPT to PPTX maintains high quality with CocoConvert's optimised encoder settings.
If you've decided PPTX is the right choice, CocoConvert makes the conversion effortless. Upload your .ppt file, pick PPTX, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert PPT to PPTX
- 1
Choose your PPT file
Upload your .ppt file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to PPTX
Select .pptx from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large presentation files.
- 4
Get your PPTX file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert PPT to PPTX
Your PPT file is decoded and re-encoded as PPTX.
Your PPT file is uploaded and the format is validated
The file content is decoded into its raw representation
The data is re-encoded in PPTX format with optimal settings
The converted file is ready for download
PPT vs PPTX — Detailed Comparison
| Feature | .PPT | .PPTX |
|---|---|---|
| Full Name | Microsoft PowerPoint Legacy | Microsoft PowerPoint |
| Compression | None (uncompressed) | Lossless |
| Typical File Size | 1–50 MB | 1–50 MB |
| Platform Support | Universal | Universal |
| Browser Support | none | none |
| Year Created | 1987 | 2006 |
| Open Standard | No | Yes |
Should You Convert PPT to PPTX?
When to Convert
- ✓You need maximum device and software compatibility
Frequently Asked Questions
Should I use PPT or PPTX?
It depends on your goal. PPT preserves full quality. PPTX preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is PPTX higher quality than PPT?
Not necessarily. Converting PPT to PPTX maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert PPT to PPTX on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for PPT to PPTX?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for PPT to PPTX?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.