How to convert photos to PDF for free
Published September 1, 2026 · Updated September 26, 2026
PDF is the format people expect when you send paperwork: it keeps page order, prints predictably and opens everywhere. Converting document photos to PDF well involves more than changing the file extension — the pages should also come out straight, evenly lit and consistently sized. This guide covers the full conversion, the A4 question, and how to keep file sizes reasonable.
Why not just embed the photo?
A raw photo dropped into a PDF still looks like a photo: tilted page, gray background, shadow across one corner. A proper conversion first crops to the page boundary and applies perspective correction, so every page in the PDF looks like it came from a real scanner. That is the difference recipients notice.
It also matters for printing. A photo embedded as-is prints with the table visible around the page and the text at an angle; a corrected scan prints like a photocopy. If there is any chance the recipient will print your PDF — HR departments and government offices usually do — the correction step is not optional polish, it is the point.
Multi-page PDFs from separate photos
In Scandut, add all the photos at once — each page appears in a review grid where you can check the detected area, then everything is scanned in one pass and lands in a tray. Review thumbnails, remove any bad page, and reorder pages with the arrow buttons if you shot them out of sequence. When you are done, one click merges everything into a single PDF. Ten receipts, a fifteen-page contract, a chapter of notes: same flow.
Original size or A4?
By default each PDF page keeps its own aspect ratio — a narrow receipt stays narrow. That is ideal for archiving. For anything that will be printed or formally submitted, switch on the A4 option: every scan is centered on a standard A4 page, so the printout matches what offices expect and mixed-size batches come out uniform. When in doubt: archive at original size, submit on A4.
Keeping the file size sensible
For text documents, Document or B&W mode produces smaller, sharper files than full color. If the PDF is destined for email, JPG-based pages at moderate quality are usually a tenth the size of PNG with no visible difference for text. Scandut offers a standard/high quality switch at export — standard is right for email and uploads, high for print and archives.
And since the conversion happens locally in your browser, there is no upload limit, no queue and no server keeping a copy of your paperwork.
FAQ
Can I mix portrait and landscape pages? Yes — each page keeps its own orientation, and with A4 mode each page gets an A4 sheet in the matching orientation. Can I add pages to an existing PDF? Not yet; scan the new pages and merge PDFs with any PDF tool, or re-scan the batch together. Is there a page count limit? No hard limit — memory on very old phones is the practical ceiling, and dozens of pages are routine.