How to convert a PDF to PowerPoint
PDF by Zaweba exports a PDF to PowerPoint with a slide per page: the page as a picture and its text as editable text boxes. Offline, no account needed.

PowerPoint export is built into PDF by Zaweba. Open the PDF, choose File > Export > PowerPoint, and you get a .pptx file with one slide per page, where each slide shows the page as a picture and carries the page's text as editable text boxes. It all happens offline on your PC.
The commonest reason for wanting this is a presentation that only exists as a PDF. Someone sent the handout, not the original file, and now you need to give the talk, change a few slides or reuse them in a deck of your own.
What each slide holds
Every page of the PDF becomes a slide, in the same order. On the slide, the page itself is drawn as a picture, so the look is kept exactly: backgrounds, charts, photos, logos and the layout all appear as they did in the PDF.
On top of that, the text from the page is placed as text boxes you can click into and change. So a heading with last year's date can be retyped, a figure can be corrected and a name can be swapped, all inside PowerPoint.
It helps to understand that combination before you start editing. The page picture sits underneath and the text boxes sit over it, so after a change, look closely at the slide to make sure nothing of the old wording shows round the new. For a slide you're going to rework heavily, it's often easier to lay out a fresh slide and copy the text across from the text boxes.
Exporting your slides
Open the PDF in PDF by Zaweba and check the pages are in the order you want. If not, reorder them first by dragging the thumbnails, and remove any pages you won't need. It's quicker to tidy the PDF than to delete slides one by one afterwards.
Choose File > Export, pick PowerPoint, name the file and save. Open it in PowerPoint, or in any program that reads .pptx files, and work through the slides.
Getting a tidy deck
A few things make the result easier to work with. Landscape pages make the best slides, because slides are landscape too. If the PDF is a portrait document, like a report, each page will sit on a slide but the shapes won't match, and you may be better off taking only the pages you need as pictures with File > Export, or snapshots of parts of them, and placing those in a deck of your own.
If the PDF came from a presentation with speaker notes, the notes are not part of a PDF page and won't come back. Only what's on the page comes across.
And if you just need to present the PDF as it is, you may not need PowerPoint at all. Showing the pages full screen from the PDF works for a talk where nothing has to change.
Other ways out of a PDF
PowerPoint is one of several formats PDF by Zaweba writes with its own code. Word documents, spreadsheets, web pages, plain text and SVG pictures are all under File > Export too, so you can pick the format that suits what comes next rather than forcing everything through one.
PDF by Zaweba is free software for Windows, with no account and no uploading, so client decks and internal slides stay on your own computer.