Stack PNGs Into One PDF
Put every PNG page in one ZIP, named in the order you want them read: the file names become the page order of the finished PDF. OCR runs underneath each picture rather than replacing it, so the page still looks exactly like the source screenshot or scan.
Once processing finishes you get a single PDF where every page carries an invisible text layer lined up behind the pixels. Open it in any reader, select a sentence that spans two of your original PNGs, and the selection follows the words rather than stopping at the old file boundary.
Why Batch PNG Scans
PNG screenshots and scanned pages tend to be uniform: same resolution, same white background, same font rendering from one file to the next, because they usually come from the same scanner pass or the same export tool. That consistency makes a combined PDF behave predictably, since text sizing and contrast rarely swing between adjacent pages the way camera photos do.
Combining ten or twenty PNGs into one PDF also means one thing to email, print or file away, instead of a folder of loose images a colleague has to open one at a time while guessing the right order for them.
Where This Set Fits
Multi-page screenshots of a contract signed through a web portal, a chat thread saved page by page, or scanned worksheets exported as separate PNGs by a flatbed scanner's software all arrive as loose image files that belong together as one document once combined.
Turning that set into a single searchable PDF makes it something you can attach to an email, file under one name in a records system, or search by keyword months later without remembering which of fifteen PNGs held the clause you needed.
Keeping Every Page Sharp
PNG is lossless, so the source pixels going into OCR are as clean as the screenshot or scan tool produced them, with none of the compression artefacts that blur letter edges the way a resaved JPEG would. Recognition accuracy on this input type is mostly limited by the original capture: a low-resolution screenshot still limits what OCR can resolve, even in PNG form.
Check the finished PDF's text layer on a page with small print or a table, since those spots reveal a marginal capture resolution first. If one page reads worse than its neighbours, re-export just that page at a higher resolution and rebuild the set rather than accepting one weak page inside an otherwise sharp file.
Ordering Your PNG Set
Name the files in page order (01, 02, 03…) before zipping them: pages follow the file names, and there's no reordering step afterwards. Mixed page sizes or orientations are kept individually, so a portrait page and a landscape page can sit side by side without either being stretched.
A screenshot that ended up sideways or upside down doesn't need fixing first: each image is turned the right way up before it's read, so every page of the combined PDF comes out upright and searchable.