Convert PPTX to PPT: Free Online Converter
Convert PowerPoint Open XML to Microsoft PowerPoint online for free. Fast, secure document conversion with no watermarks or registration.
PPTXに対応
アップロードすることで、これらのファイルの権利を有していること、および利用規約に同意することを確認したものとみなされます。
変換設定: ファイルを追加すると調整できます
安全な転送
HTTPS暗号化アップロード
プライバシー優先
ゲストのファイルは約2時間で自動削除
登録不要
すぐに変換を開始
どこでも動作
あらゆるブラウザ、あらゆるデバイス
PPTX から PPT への設定
- エンジン
- ドキュメント
- 設定
- 調整できる設定: 1
- Page Size
変換方法
アップロードエリアにドラッグするか、クリックして選択し、.pptxファイルをアップロードしてください。
必要に応じて出力設定を調整してください。デフォルト設定ではオリジナルの品質を維持します。
「変換」をクリックし、準備ができたら.pptファイルをダウンロードしてください。
PPTXからPPTへの変換について
PPTX is the modern PowerPoint format introduced with Office 2007: a ZIP archive of XML files with support for SmartArt, advanced animations, theme colors, and high-fidelity media embedding. PPT is the legacy binary format used by PowerPoint 97-2003, which stores slides, animations, and images in a single binary stream using the OLE2 compound document structure. Converting PPTX to PPT downgrades a modern presentation to the older format for compatibility with systems that cannot handle the newer format.
The conversion translates PPTX's XML-based slide structures into PPT's binary record format. Slides, text, shapes, and basic animations are mapped to their PPT equivalents, while PPTX-specific features like SmartArt, modern animations (morph, 3D), and theme-based styling are degraded to simpler representations.
PPTXをPPTに変換する理由
Some organizations, educational institutions, and legacy systems still require PPT format. Computer labs running Office 2003, projector systems with built-in PowerPoint viewers from the 2000s era, and embedded systems with PPT rendering capabilities cannot open PPTX files. Converting to PPT ensures the presentation can be opened on these legacy platforms.
PPT is also required by some e-learning authoring tools, kiosk software, and industry-specific applications that were built around the PowerPoint 97-2003 format. If your delivery platform explicitly requires PPT, this conversion is necessary.
主な活用例
- Present on legacy systems that only support PPT format (older projectors, kiosks)
- Share presentations with users running PowerPoint 2003 or earlier
- Submit presentations to e-learning platforms that require PPT input
- Provide backward-compatible presentations for organizations with strict IT policies
- Convert PPTX templates to PPT for use with legacy automation tools
仕組み
LibreOffice imports the PPTX ZIP archive and exports to PPT binary format using the PowerPoint 97-2003 export filter. The converter translates PresentationML slide structures to PPT binary records: text frames become text run records, shapes become MSO drawing records, and slide transitions are mapped to PPT transition enumerations. SmartArt is flattened to grouped shapes or static images. Theme-based colors are resolved to fixed RGB values. Morph and other modern transitions are replaced with basic equivalents (fade, dissolve). The output is an OLE2 compound file containing the binary presentation data.
品質とパフォーマンス
Standard presentation elements — text, basic shapes, images, tables, and simple animations — convert reliably. Features introduced after PowerPoint 2003 — SmartArt, modern animation effects, morph transitions, 3D rotation, theme-based styling, and embedded video — are either degraded to simpler representations or converted to static images. The visual design will be recognizable but may lose polish. For presentations using only basic features, the conversion is high-fidelity.
デバイス互換性
| Device | PPTX | PPT |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
最良の結果を得るためのヒント
- 1Keep the original PPTX as your primary file — PPT should only be used for legacy delivery
- 2Simplify complex SmartArt and animations before converting for better preservation
- 3Test the PPT on the actual target system to verify compatibility
- 4Replace theme-dependent colors with explicit RGB values before converting for consistent appearance
- 5Check that all text rendered correctly — font metrics may differ slightly between PPTX and PPT
関連する変換
PPTX to PPT conversion serves legacy compatibility needs. Keep the original PPTX for editing and use PPT only for delivery to systems that require the older format.
PPTXとPPTの比較
| 特徴 | PPTX | PPT |
|---|---|---|
| 正式名称 | Microsoft PowerPoint Presentation | Microsoft PowerPoint 97-2003 |
| 拡張子 | .pptx | .ppt |