Choose an iPhone for fast capture of ordinary, replaceable documents when portability and immediate sharing matter most. Choose a flatbed for repeatable alignment, controlled lighting, and careful capture of flat photographs or detailed pages. Do not force fragile books, oversized items, curled photographs, or valuable originals onto either device: preservation guidance may point to a copy stand, cradle, larger platen, or professional service.
Scope: This is a practical selection guide, not a claim that a phone image meets archival, legal, evidentiary, or regulatory digitization standards. Sources were reviewed on .
Choose by the job, not the device label
Use an iPhone when:
- the document is ordinary and replaceable;
- you need a PDF or image immediately;
- you are away from a desk;
- automatic edge detection and perspective correction produce readable results;
- speed matters more than perfectly repeatable color and geometry.
Apple’s current Notes documentation describes automatic boundary detection, manual capture, corner adjustment, filters, multiple pages, and PDF output. A dedicated scanner app can add a different OCR or export workflow, but the camera remains a camera: lighting, angle, focus, reflections, and movement affect the capture.
Use a flatbed when:
- the original lies safely and completely on the platen;
- you want controlled, even illumination without hand-held perspective;
- small print, line art, texture, or photographic detail matters;
- you need consistent settings across a set;
- the output must follow a defined resolution, color, file-format, or quality-control specification.
Preservation changes the answer
The US National Archives says flat paper and photographs should fit completely on the scanner surface and warns that a lid can crush or crease an oversized original. It advises using a copy stand and book supports for books, and says automatic feeders are unsuitable for fragile, weak, bent, or valuable papers.
That guidance produces three different decisions:
- Flat and robust: a flatbed may provide the most controlled capture.
- Bound or unable to lie safely flat: an overhead camera or copy stand with support may be safer.
- Fragile, damaged, mold-affected, or uniquely valuable: stop and consult a conservator or experienced digitization provider.
Resolution numbers do not make phone and flatbed captures equivalent
A flatbed setting can be expressed as pixels per inch relative to an original placed on the platen. A phone photograph depends on camera distance, framing, lens, perspective correction, stabilization, and processing. Converting the final pixel count into a nominal “DPI” does not prove the same detail, sharpness, color, or geometric accuracy.
For institutional work, the 2023 FADGI technical guidelines use more than one number: they address imaging performance, targets, quality management, metadata, and material categories. For federal textual records, NARA’s transfer guidance gives resolution and bit-depth requirements tied to document characteristics. Those standards are intentionally more demanding than “the text looks readable on my phone.”
A fair quality test
Take one page you actually care about — a contract with small print, a receipt that has faded, a photograph with detail in the shadows — capture it with both devices (the phone-side technique is in using your phone as a scanner), and then look at:
- all four edges and any content near them;
- small type, punctuation, signatures, stamps, and faint pencil;
- page shape and straight lines near the frame edges;
- glare, shadows, paper texture, and color shifts;
- OCR errors and reading order;
- file format, compression, metadata, and ability to reopen the file elsewhere.
Judge the file at its intended use size. A receipt for reimbursement, a family photograph, and a preservation master have different acceptance criteria.
Speed and volume
An iPhone wins when the scanner is not nearby or when immediate capture prevents loss. A flatbed reduces hand positioning but still requires placing each item. An automatic document feeder can be faster for uniform, expendable sheets, yet it adds jam and damage risk and should not be used for fragile originals.
For a large mixed collection, sort first. Use the iPhone for ordinary reference copies, a flatbed for safe flat items needing controlled capture, and a copy stand or specialist for bound, oversized, reflective, or fragile material.
Where ScanLens fits
ScanLens provides an iPhone capture, on-device OCR, and PDF or image export workflow. It is not a flatbed, a calibrated preservation system, or a conservation service. Use it when the phone is the right capture device, and keep the original when preservation or formal requirements matter.
See the old-photo capture guide, the original-retention checklist, and the current ScanLens App Store listing.
Bottom line
For ordinary paperwork, start with the iPhone because it is fast and usually close at hand. For controlled capture of flat originals, start with a flatbed. For valuable, fragile, bound, or oversized items, start with safe handling and choose the equipment afterward. The best scanner is the one that meets a defined output requirement without risking the original.
