How to scan a document to PDF with your iPhone
Your iPhone can produce a perfectly good PDF scan two ways: the built-in Notes scanner, which flattens and cleans up flat white pages automatically, or plain photographs converted to PDF afterwards, which copes with books, glossy paper and coloured forms and lets you set the page size. The camera technique matters more than either tool.
The short answer
Two routes, and they suit different jobs. The Notes scanner (open a note, tap the camera button, choose Scan Documents) detects the page edges, flattens the perspective and produces a clean scan - excellent for flat white paper. Or take ordinary photos and convert them to PDF afterwards, which handles bound books, glossy paper, coloured forms and anything the edge detector struggles with, and gives you control over the finished page.
What "scanning" with a phone actually means
There is no scanner in your iPhone. What these tools do is take a photograph and then correct it: find the rectangle of the page, stretch it back to a proper rectangle, even out the lighting, and increase contrast so the text separates from the paper.
That correction is only as good as the photo underneath it. Nothing recovers detail a blurry or badly lit photograph never captured. Which is why the biggest improvement available to you is not the app - it is thirty seconds of care with the camera.
Take the photo properly
- Get even light. Near a window on an overcast day is close to ideal. Direct sunlight blows out white paper; a single ceiling bulb behind you casts your own shadow onto the page.
- Hold the phone parallel to the page. Directly above, not at an angle. Perspective correction works better the less there is to correct.
- Use a contrasting background. White paper on a dark table gives edge detection something to find. White paper on a white desk gives it nothing.
- Fill the frame, but leave the edges in. If a corner is cropped off, it is gone.
- Tap to focus on the text and wait for it to settle before shooting. Autofocus frequently locks onto the table instead.
- Flatten the page. Fold creases and curling corners cast shadows that read as smudges after contrast correction.
Method 1 - The Notes scanner
- Open Notes and start a new note.
- Tap the camera or attachment button and choose Scan Documents.
- Hold the phone over the page. It captures automatically once it finds the edges, or tap the shutter yourself.
- Adjust the corner handles if the detected edges are wrong, then tap Keep Scan.
- Repeat for each page, tap Save, then share the scan out of the note as a PDF.
It is free, it is already on the phone, and for flat white documents on a contrasting surface the result is genuinely good.
Where it struggles: pages in a bound book, glossy or laminated paper, coloured or pre-printed forms, and anything where the edges are unclear - the detector either refuses or crops something important. The output page size is also decided for you, and the scans live inside a note rather than as a document you control.
Method 2 - Photograph, then convert
Sometimes you want the photograph itself, unprocessed: a receipt on a patterned table, a page of a hardback that will not lie flat, a form where the background colour matters. Photograph each page normally, then convert the set into a PDF.
In JPG To PDF Converter PRO:
- Tap JPG to PDF and select the photos, or take them in the app as you go.
- Put them in reading order and drop any retakes.
- Set the page size to A4 or Letter so every page matches, and add small margins if the document will be printed.
- Choose high quality for anything with small print, then preview each page.
- Add a password if it is a payslip, an ID or a contract - then save or share.
Which one should you use?
- Flat white paper, loose sheets — Notes scanner. Fast and free.
- Bound books, glossy paper, coloured forms — photograph and convert.
- Someone specified A4 or Letter — photograph and convert; Notes does not let you choose.
- The document is private — photograph and convert, with a password on the PDF.
- You will need to send it again next month — a converter that keeps a history saves you re-photographing the whole thing.
Getting text that stays readable
Scanned text is judged at 100% zoom on someone else's screen, or printed. Two settings do most of the work:
- Quality. High for anything with small print, signatures or handwriting. Medium is fine for a receipt. The difference shows up exactly where it matters - the fine print.
- Page size. Match the destination. A Letter-sized page sent to an A4 printer gets scaled down, and scaling is what turns clear handwriting into soft grey.
Common mistakes
- Shooting at an angle. Perspective correction can only do so much; text near the far edge ends up stretched and soft.
- Letting your shadow fall across the page. Contrast correction turns a shadow into a grey band across the text. Light from the side, phone directly above.
- Using flash on glossy paper. You get a white hotspot exactly where the flash reflected, usually over the middle of the page.
- Not checking the last page. Retakes land out of order more often than anything else.
- Sending an unlocked scan of an ID. If it has an address, an account number or a signature on it, put a password on the file before it leaves your phone.