Yes. Upload your .pptx file, edit text, move and resize shapes, replace images, and add or reorder slides in the browser, then download a faithful .pptx.

Yes. Edits are applied as surgical changes to the original file rather than a full rebuild, so parts you didn't touch stay byte-identical and the file opens without a repair prompt.

No. Editing runs entirely in your browser, so your presentation never leaves your device.