免费演示文稿转换器
在 PPT 和 PPTX 之间转换 PowerPoint 演示文稿，或将演示文稿转换为 PDF 以便分享和打印。
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PPTX
The modern PowerPoint presentation format, used by PowerPoint, Keynote, and Google Slides.
PPT
The legacy PowerPoint format from before 2007, still found in older slide decks.