Why a folder of photos is not a document
Photographing paperwork with a phone is now the normal way to digitise it, and for good reason: the camera in your pocket out-resolves most flatbed scanners and is always with you. What it produces, though, is a folder of JPEGs. That is fine for keeping a personal copy and unworkable for anything else. You cannot email nine separate images as a contract. You cannot upload a scattered set of files to a portal expecting one document. And you cannot search a single word of any of it.
A PDF solves the container problem: one file, in order, that opens the same way everywhere and prints with predictable page boundaries. But a PDF built naively from photographs is still only a stack of pictures. It looks like a document to a human and remains completely opaque to every system that has to process it.
The missing piece is the text layer, and it is what separates a scan you can use from one you merely have. This tool does both jobs in one pass: it assembles ordered pages into a single PDF, and it runs optical character recognition over each one to embed an invisible, precisely positioned text layer underneath the image. The result looks exactly like your photographs and behaves like a text document.
What OCR gives you that a photo cannot
Optical character recognition reads the shapes in an image and works out which characters they are. In a searchable PDF the recognised words are written back into the file as invisible text, positioned over the pixels they came from. Selecting a paragraph selects real text. Searching the document finds real matches. Copying pulls out characters rather than a screenshot.
That changes what the file is capable of downstream. Full-text search across a document archive starts working. Screen readers can read the page aloud, which for a scanned document is the difference between accessible and useless. Compliance and e-discovery systems can index the contents. And you can pull a reference number out of an invoice without retyping it from the screen.
Accuracy depends on the input, and the relationship is unforgiving in one direction: recognition is close to perfect on clean printed text and unreliable on anything that is blurred, skewed, low-resolution or unevenly lit. It is worth understanding this before you photograph twenty pages, because the fix is almost always at capture time. Fill the frame with the page, hold the camera parallel to it, and photograph in even light rather than under a single overhead lamp.
The cleanup pass, and when it pays for itself
Real-world document photographs have four characteristic problems, and the optional cleanup pass addresses each of them separately so you only pay for what you need. Shadows are the most common: your own hand, a lamp or a window produces a gradient across the page that makes half of it darker than the other half, which defeats any simple threshold and confuses recognition. The de-shadow stage flattens that gradient so the page is evenly lit.
Page curl is next, and it is the reason photographs of bound books read worse than loose sheets. Text near the spine curves away from the camera, so the lines bend and the characters compress. Dewarping flattens that curvature back to a rectangle. Contrast enhancement handles faint originals — pencil, faded carbon copies, thermal receipts that have started to disappear — by pushing grey paper toward white and grey ink toward black. And the 2× upscale doubles resolution, which is what small text photographed from too far away actually needs.
Each stage is a switch, and all of them together still cost 2 credits per page, so there is no reason to be sparing with the combination once you have decided a page needs help. The judgement worth making is whether it needs help at all. Photograph one page well, build a PDF without cleanup, and look at the text layer. If it is accurate, save your credits for the pages that are genuinely difficult.
Photographing pages so they scan well
The cheapest quality improvement is not a setting; it is thirty seconds of care at capture. Put the page on a flat, contrasting surface — a dark desk under white paper — so its edges are unambiguous. Fill the frame with the page and hold the phone parallel to it rather than at an angle, because perspective distortion turns a rectangle into a trapezoid and every line of text into a slightly different size.
Light it from the side or from two directions rather than from directly overhead, which is what puts your own shadow on the page. Avoid direct flash on glossy paper, where the specular highlight will erase a paragraph completely. And tap to focus before you shoot: phone cameras focus on whatever is closest, which at close range is often the edge of the desk rather than the text.
Keep the pages in order as you shoot, so you are not reordering nine near-identical thumbnails afterwards. The tool lets you reorder freely, but recognising which photograph is page six of a contract from a thumbnail is genuinely hard, and it is much easier to avoid the problem than to solve it.
What stays on your device, and what does not
This is a hybrid tool and the split is worth being precise about. Adding pages, reordering them, running OCR and building the PDF all happen in your browser. No file leaves your device for any of it, and there is no server-side copy, which is why those steps are free and unlimited — there is no infrastructure for us to pay for.
The AI cleanup pass is the exception. Shadow removal, dewarping, contrast enhancement and upscaling need a GPU, so pages you send through cleanup are uploaded, processed and returned. The page carries a hybrid-processing badge to make that visible rather than leaving you to infer it, and it is the only step that costs credits.
The practical consequence is that you have a genuine choice. For a document that must not leave your machine — a signed contract, medical records, anything covered by a confidentiality obligation — skip cleanup and the whole workflow stays local. For a difficult scan where accuracy matters more, the cleanup pass is available at 2 credits per page and the trade-off is yours to make rather than ours.