How to Scan Documents to PDF with Your Phone
Last updated
Phones make excellent document scanners once you stop using the default camera. The right app handles edge detection, perspective correction, contrast adjustment, and OCR — turning a hand-held photo into a clean, searchable PDF that looks scanned rather than snapshotted.
This guide walks through the document-scanning workflow in the PDF Editor app on iPhone or Android. Both platforms produce equivalent results. We'll cover everyday cases: receipts, signed forms, multi-page contracts, IDs, and the times when scanning beats walking to a flatbed scanner.
By the end you'll have a repeatable scanning routine that works in less than ideal lighting, produces files that accountants and legal teams accept without question, and keeps everything on-device.
Step by step
- 1
Open the scanner
Tap the Scan tile on the home screen of the PDF Editor app. The camera viewfinder opens with edge detection active.
- 2
Place the document on a contrasting surface
Edge detection works best when there's clear contrast between the page and the surface behind it. Put white paper on a dark surface or vice versa.
- 3
Aim the phone over the page
Hold the phone roughly above the document. The app draws a blue outline around the detected edges. When the outline is steady, it auto-captures.
- 4
Auto-capture or tap manually
The camera pulses and snaps when framing is right. If the auto-capture is missing the edges, tap the manual capture button. You can always adjust the corners next.
- 5
Adjust the detected corners
Drag the corner handles to fine-tune the edges if needed. Perspective correction kicks in after this step, producing a rectangular page from the angled shot.
- 6
Apply a filter
Pick Color, Greyscale, or Black-and-White. For receipts and forms, B&W shrinks the file significantly without quality loss. For documents with photos or color elements, stick with Color.
- 7
Add more pages
Tap the page counter at the bottom of the screen to capture additional pages. Each new capture appends to the current PDF. Reorder pages from the thumbnail strip if needed.
- 8
Save the PDF
Tap Done, give the file a meaningful name, and save. OCR runs in the background, making the resulting PDF searchable. You can then share, print, or upload to a cloud drive.
Tips
- Diffuse, even lighting beats bright overhead lighting — direct light creates glare on glossy paper or laminated forms.
- Place the document flat. Curved pages (like an open book) cause text distortion that perspective correction can't fully fix.
- For receipts, the Black-and-White filter typically reduces the file size by 60-80% with no readability loss.
- If you scan IDs or passports, save the resulting PDF into a password-protected folder or apply a PDF password before sharing.
- The auto-capture works in under a second when framing is good. If it's struggling, the lighting or contrast is probably the issue.
Try it on your phone
The complete scan-and-save flow takes under 30 seconds for a multi-page document. Compared to walking to a flatbed scanner, downloading scanner software, and managing email attachments, the phone wins decisively for everyday business needs. The output is the same standard searchable PDF every accounting tool and document system accepts.
