The Problem with Multi-Page Scans
When scanning a multi-page contract, file or brochure, you often end up with a series of individual image files or multiple small PDFs. This is inconvenient: documents have to be sent individually, archived separately and searched through manually. The solution is straightforward, combine all pages into a single PDF.
Method 1: Flatbed Scanner with Automatic Document Feeder (ADF)
Anyone with a modern office scanner has the most comfortable solution readily available. Scanners with an automatic document feeder can pull an entire stack of pages through one by one and save them as a single PDF. In the scanner software, ensure the option Multi-page PDF is selected, not individual images.
Pay attention to these settings:
- Resolution: 300 dpi for standard text, 200 dpi for purely text documents, 400 dpi for small print or handwritten notes
- Colour mode: Black and white or greyscale for text documents saves storage space significantly; use colour only if graphics or photos are included
- Compression: CCITT G4 for B&W documents is space-efficient without quality loss
Method 2: Smartphone Camera as Scanner
Anyone without a scanner can achieve very good results with a smartphone camera. Modern scanning apps automatically detect document edges, correct perspective (trapezoidal distortion from angled shots) and improve contrast.
Procedure:
- Place the document on an even, contrasting surface (white sheet on a dark table, or vice versa)
- Photograph each page individually, preferably from directly above with even lighting and no shadows
- Combine all page images into one PDF
With the scan-to-PDF tool on pdfmonster.de, you can combine multiple photos directly in the browser into a single PDF. Upload all images in the desired order, the tool creates a neatly structured PDF from them.
Method 3: Merging Individual PDFs or Images Afterwards
Sometimes you end up with several individual files that need to be combined later. Whether individual scans as JPG, multiple small PDFs or a mix of both, with the PDF merge tool you can combine any combination into a single document. Simply drag the files into the tool in the desired order and start the merge.
Tips for Best Scan Quality
Lighting
Even, diffuse light without shadows produces the best results. Direct sunlight or a single light source creates harsh shadows that can make text illegible. Overcast daylight or well-positioned room lighting is ideal.
Scanning Bound Documents
With books or firmly bound booklets, the centre of the document does not lie flat on the scanner glass. This leads to distorted, blurry lines in the binding zone. Press the document as flat as possible or use a book scanner. Alternatively, photograph each page individually with the smartphone camera, the slightly greater distance bridges the curvature better than the scanner glass.
Double-Sided Documents
When scanning double-sided documents with an ADF scanner, enable the duplex option. Some scanners offer automatic duplex detection. Without ADF: scan all front pages first (1, 3, 5...), flip the stack and scan all back pages in reverse order (6, 4, 2...), so the order is correct when merging.
Optimising File Size Afterwards
Multiple high-resolution scans can quickly create a very large PDF. If the document is only for screen reading, compression after creation is worthwhile. The compression tool reduces file size without making text illegible.
OCR: Making Scans Searchable
A scanned PDF initially contains only images, no real, searchable text. To make the document fully usable, OCR processing is recommended. The result is a PDF where recognised text is invisibly layered over the scan and can be searched and copied.
Conclusion
Saving multiple pages as one PDF is straightforward with the right tools. An ADF scanner is most convenient; a smartphone with a good app is a fully capable alternative. The keys to quality are sufficient resolution, even lighting and the correct colour depth. Following these basic principles produces clean, archivable documents.