How the slides are built
Every page of the PDF becomes one slide, and the slide has the same shape as the page: an A4 portrait PDF gives A4 portrait slides, and a presentation saved as PDF gives wide slides again. If later pages have another size, they are fitted onto the slide and centred. In editable mode the tool draws each page twice with pdf.js, once as it looks and once without its upright text. The second drawing becomes the background picture of the slide, so photos, logos, coloured boxes and lines stay exactly where they were. The text is then placed on top as separate text boxes, one per line or table cell, in the Office font closest to the PDF font, at the same size, with bold, italic and the ink colour measured from the page itself.
Editable text or pictures: which mode to choose
Choose editable text when you want to change the wording, translate the slides or reuse the content in another deck. Choose pictures when the slides must look exactly like the PDF, for example a designed brochure or a signed form, or when you only need to show it on a screen; pictures cannot be edited, but nothing can shift. In editable mode the text uses the fonts installed on the computer that opens the file, so a line can come out slightly longer or shorter than in the PDF. Each line is a box of its own and never wraps, so the layout holds. Text drawn sideways, text drawn as shapes and text hidden behind a scan stay part of the background picture. Standard quality draws pages at 144 dpi, enough for a projector or a laptop screen; high quality uses 216 dpi for large screens and printing and makes a bigger file.
Arabic and right-to-left PDFs
Arabic lines are read from right to left and written into the slide as right-to-left paragraphs, aligned to the right edge where the line ended in the PDF, so PowerPoint shows them the right way round and you can type in them normally. An English name, an email address, an IBAN or a phone number inside an Arabic line keeps its own left-to-right order. Many Arabic PDFs store the joined letter shapes instead of ordinary letters; the tool turns them back into normal Arabic letters, so the text can be searched, spell-checked and edited. In our test file, an Arabic invoice made by LibreOffice with English words, an IBAN and phone numbers in its lines, every line came out in the order the PDF shows it.
Scanned PDFs, protected files and other limits
A scanned PDF, or a phone photo saved as PDF, has no text inside, only a picture of the page. Those pages become picture slides, and the tool lists them so you know which ones they are; to get their words, read them first with Image to Text (OCR). A password-protected PDF has to be unlocked with Unlock PDF before it can be read, and a damaged or empty file gets a clear message instead of an empty presentation. Charts and tables arrive as text boxes over a picture of their lines, not as PowerPoint charts or tables. Animations and speaker notes do not exist in a PDF, so there are none to bring over. The limit is 100 MB per file; phones handle smaller files better.
Private by design
The PDF is read and converted by this browser tab, and the .pptx file is written on your device, so sales decks, board papers and client proposals never reach a server. There is no sign-up, no watermark on the slides and no limit on how many files you convert. To go the other way, from a PowerPoint file to a PDF, use PowerPoint to PDF; if you only need the words, PDF to text is quicker.