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Office workers comparing a document feeder for sheet stacks with a flatbed holding an open book face down against the scanning glass.
Feeding a supported sheet stack and placing a book or delicate original on glass are different scanning jobs. The book's pages face the glass; confirm each scanner's supported originals and duplex capability.

Office equipment

Duplex scanner, document feeder or flatbed? Start with the paperwork.

A stack of two-sided invoices, a bound book and a fragile receipt are different scanning jobs. Compare the way paper moves through the scanner before comparing the largest speed number on the box.

By Atlas Liaison Group · Sources checked November 2, 2026 · Documentation research

ADF vs duplex scanning vs flatbed: what each means

TermWhat it tells youWhat still needs checking
ADF: automatic document feederThe scanner can feed a supported stack of originals.Paper sizes, weights, condition, capacity and whether it scans both sides automatically.
Duplex scanningThe scanning workflow captures both sides.Whether the model does it in one pass and how its software orders the resulting pages.
FlatbedYou place an original on a glass scanning surface.Usable scan area and suitability for the books, photos or delicate items you handle.

These features can coexist. Epson's DS-1730 combines a flatbed with an automatic feeder and single-pass duplex scanning. Its ES-400 II uses an automatic feeder and duplex scanning, with an optional flatbed arrangement described separately. Those examples show why “document scanner” alone does not identify the paper path.

Count sides as well as sheets

If you need both sides of 30 sheets, the task contains 60 page images. A useful comparison asks how quickly and reliably you get that complete file, not just how fast one side passes the sensor. Check the manufacturer's definitions and test conditions when comparing pages per minute with images per minute.

Printing on both sides and scanning both sides are also different functions. If you are considering a multifunction printer, inspect its scanning specification explicitly rather than inferring it from a duplex-printing feature.

Use a representative five-document trial

  1. A normal single-sided letter.
  2. A two-sided document where both sides matter.
  3. A long or unusually sized item you regularly receive.
  4. A receipt or delicate original, handled only by a method the manufacturer supports.
  5. A document containing a name or reference you will later need to search.

For each sample, check feeding, orientation, cropping, page order, legibility and the final filename. Remove staples and prepare originals according to the scanner's instructions. Do not assume that a feeder suitable for ordinary sheets can safely handle every receipt, card or damaged original.

Check the file you will actually use

Optical character recognition can make a scanned document searchable, but the included software, operating-system support and output options need their own review. Epson describes searchable-PDF workflows for the models cited below. That does not establish identical software or licensing for every scanner.

Try searching for a word from your sample and reopening the saved file from its intended folder. A fast scan that ends up in an unfindable location has not completed the filing job. Decide who may access the folder, how files are named and how the records will be backed up.

Buy for the recurring task

A business with occasional documents may already have a suitable scanning route. A team repeatedly processing two-sided stacks has a different reason to examine a feeder and duplex capture. Keep the rare book or delicate original in the decision too, so a faster batch workflow does not leave an important document type unsupported.

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Related: Evaluate the software around the task · Choose equipment for a small shipping operation.

Sources