This viewer opens a PowerPoint file in your browser so you can read it without installing Office, signing into a cloud account, or converting the deck to something else first. It is meant for the moment you are handed a .pptx and only need to look at it: an attachment on a borrowed laptop, a deck on a machine where you cannot install software, or a file you would rather not upload to a stranger's server. The file is read on your device and rendered in the page — it is never sent anywhere.
No. The file is opened with your browser's file API and rendered in the page. It stays on your device, which also means the viewer works with no network connection once the page has loaded.
Close, but not identical. Text, images, basic shapes and tables render well. Charts, SmartArt, animations, slide transitions and fonts that are not installed on your device can differ from what PowerPoint shows. For a pixel-exact review, open the file in PowerPoint itself.
No. The legacy binary .ppt format is not supported — only the .pptx package used by PowerPoint 2007 and later. Opening the old file in PowerPoint or Google Slides once and saving it as .pptx is enough to make it readable here.
No, this is a viewer. It renders the deck for reading and presenting; it does not change the file. Nothing you do in the page is written back to your document.
Presentations built from images — for example a deck produced by our PDF to PPTX converter — render exactly, because each slide is a single picture. Decks that rely on charts, embedded objects or unusual fonts depend on how faithfully those features can be redrawn in a browser.