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 elsewhere 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; if a file is over the limit, is not a JPG, PNG or WebP image, or would take the PDF past 20 pages, it is left out and the page tells you why.

Two options shape the output. Page size offers A4, Letter, or Match image: A4 and Letter pages are portrait, while Match image gives every page its own photo's proportions at 210 mm wide, so portrait and landscape pages can sit in the same PDF. 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, or crop or remove backgrounds. A searchable PDF needs an OCR step, which this site does not offer.

Two behaviors surprise people most. Every image is re-encoded to JPEG at a fixed high quality during assembly, so PNG or WebP transparency is flattened onto 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 an A4 or Letter page leaves blank margins; choose Match image, or crop beforehand, to avoid that.

The tool does not rotate pages, so a photo taken sideways stays sideways in the PDF: turn it upright first with Flip and Rotate Image. With A4 or Letter, a landscape photo sits small in the middle of a portrait page. 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 finer control, clean each image first with Enhance Contrast or Clean Document Scan.

Other 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 reordering is done with the arrow buttons on each row, as there is no drag-and-drop in the page list.

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 white margins from aspect-ratio mismatches; that is a sign to switch to Match image or crop the source image and rebuild.

For tax receipts, signed agreements or ID documents, confirm figures, dates and signatures are readable and uncropped; the PDF is image-only, with no searchable text.