How to Scan a Book to PDF: Batch Photos, Merge, OCR, and Compress

Scanning an entire book with a phone camera is entirely feasible, but treating it as one heroic session is how projects die at chapter three. The workable approach is a pipeline with small, repeatable stages: photograph in batches, convert each batch to PDF, merge the batches into a volume, run OCR to make it searchable, and compress the result to a practical size. Each stage takes minutes, can be paused and resumed, and produces an intermediate file you can verify before moving on. A three-hundred-page book becomes a series of comfortable evening sessions rather than one exhausting marathon.

Capture quality determines everything downstream, especially OCR accuracy. Work in bright, even, indirect light to avoid shadows in the gutter between pages, hold the phone parallel to the page rather than at an angle, and keep a consistent distance so page sizes match. Shoot one chapter or twenty to thirty pages per batch, and name or timestamp batches so their order is unambiguous. Flatten stubborn pages with a glass sheet if the binding is tight. Blurry or skewed captures are cheap to reshoot immediately and expensive to discover after everything has been assembled, so glance through each batch before putting the book down.

Now bring the batches into PdfWill, where everything runs locally in your browser and no page of your book is ever uploaded. Feed each batch of photos to the Image to PDF tool, which converts a set of JPG or PNG images into a single PDF with one photo per page, in the order you arrange them. If some shots captured too much table or need straightening at the edges, the crop tool trims margins across pages, and rotate fixes any sideways captures. You emerge with one tidy PDF per chapter, each small enough to check page by page in a minute or two.

The assembly stage turns chapters into a book. Use the merge tool to combine the chapter PDFs in reading order into a single volume, then run the OCR tool over the merged file. OCR adds an invisible text layer beneath each photographed page, producing a searchable PDF in which you can find any phrase, or it can export plain text if you want to quote passages. English and Chinese are recognized by default. Be aware of the honest limits: clean printed text recognizes very well, while handwriting, marginalia, and ornate typefaces yield only limited accuracy, so skim the results before relying on them.

Two closing steps make the archive livable. A photographed book easily reaches hundreds of megabytes, so run the compress tool to shrink it dramatically; text pages tolerate strong compression well, and the searchable OCR layer is preserved. Add the page numbers tool if you want printed folios matching the PDF viewer. Finally, a word about copyright: scanning a book you own for personal reading, backup, or accessibility is broadly accepted in many places, but distributing scans of copyrighted works is another matter entirely. Keep personal digitization personal, and enjoy having your bookshelf searchable in your pocket.