Scan to PDF — Multiple Images to PDF

Scan to PDF exists for the moment you have several separate images of a document — phone photos of a signed contract, a stack of receipts, pages of a form you photographed one at a time — and you need them delivered as a single PDF rather than a folder of JPGs. It assembles those images into one file, in the order you set, so a recipient opens one attachment instead of scrolling through ten pictures.

Practical fits are everyday and administrative: packaging receipt photos into one PDF for an expense claim, combining scanned pages before emailing or uploading to a portal that only accepts PDF, and preparing student or office paperwork (signed sheets, ID copies, multi-page handouts) for submission. For business sharing it is the difference between a tidy document and a cluttered message thread.

It is not a camera, a scanner driver, or an editor. It does not capture pages, detect document edges, or rewrite text. It takes images you already have and binds them — so it pairs naturally with cleanup tools you run beforehand and with an OCR step you run afterward if the PDF needs to be searchable.

Drop or select your images — JPG, PNG, and WebP are accepted — into the drop zone; you can keep adding files in passes. Each page appears in a list with a thumbnail and file size. Reorder using the up and down arrow buttons on each row, remove any page with the X, or clear everything to start over. The limits are 20 pages per PDF and 30 MB per image; extra images beyond 20 are not added and non-image files are ignored.

Two options shape the output. Page size offers A4, Letter, or Match image, where Match sizes pages to the first image's proportions. Page cleanup offers None, Grayscale, or Boost contrast — a fixed grayscale conversion or a single preset contrast-and-brightness lift applied to every page, not a per-page adjustment. Press Create PDF and the file is assembled in your browser using jsPDF, then offered as a download named scan.pdf.

Everything runs locally: images are read on your device, the PDF is built on your device, and nothing is uploaded or kept after the tab closes. What the tool deliberately does not do: add a searchable text layer (OCR), rotate or deskew individual pages, crop or remove backgrounds, or set a different page size per page. For a searchable result, run the finished PDF through Make PDF Searchable.

Two behaviors surprise people most. Every image is re-encoded to JPEG at a fixed quality during assembly, so PNG or WebP transparency is flattened — transparent areas render as solid (typically black or white), which matters for screenshots or logos with alpha. And because images are fit to the page with aspect ratio preserved and centered, a photo whose shape differs from the page leaves blank margins (letterboxing); use Match image, or crop beforehand, to minimize that.

Page sizing and orientation are document-level, not page-level. The chosen size applies to all pages, and orientation is decided once, so mixing portrait and landscape photos will leave some pages with extra whitespace or sideways content — the tool does not auto-rotate. The cleanup presets are also blunt instruments: Boost contrast is a single fixed strength, so a faint pencil scan may not lift enough and an already-dark photo can crush to black. For real shadow removal, deskewing, or auto-crop, clean each image first with the dedicated scan tools.

Other honest pitfalls: a large 20-page set of high-resolution photos can be slow or memory-heavy on an older phone, since the work happens on your device; the JPEG re-encode means fine line detail and small text soften slightly versus the original; and the drag-handle icon is visual only — reordering is done with the arrow buttons, so add and order pages with that in mind rather than expecting drag-and-drop.

Open the finished PDF and confirm the basics: every page you added is present, the page order matches what you intended, and nothing duplicated or dropped out. Check orientation page by page — look for sideways or upside-down scans the tool did not rotate — and confirm that text on each page is legible at normal zoom rather than softened past readability by the JPEG step.

If you applied cleanup, verify it helped rather than hurt: grayscale should keep text crisp, and Boost contrast should darken faint strokes without blacking out shadows or losing pale ink. Watch for unexpected solid backgrounds where an image had transparency, and for white margins from aspect-ratio mismatches — both are signs to adjust the source image or switch page-size mode and rebuild.

For anything official or financial — tax receipts, signed agreements, identity documents, reimbursement claims — verify the output manually against the originals before relying on or submitting it. Confirm that figures, dates, and signatures are fully readable and uncropped, and remember the PDF is image-only with no searchable text; if the recipient or system needs selectable or searchable content, add an OCR layer afterward and re-check that step too.