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🔍 How to Improve Scanned Document Quality: Lighting, Crop, Skew and Readability

By the MZScan team · Updated 17 October 2026 · 4 min read

A scan can be perfectly readable or frustratingly poor, and in most cases the difference is decided before you press any button. This guide gives you a practical order of work: get a good photo first, fix the crop, then use the scanner controls to clean up the page and check that small text and numbers are really readable.

Start with the photo, not the settings

Software can brighten a page and remove a shadow, but it cannot invent detail that the camera never captured. Spend a minute on the photo and you will need far fewer corrections later.

• Light: use even daylight from a window, or a lamp placed to one side. Keep your own shadow off the paper, and switch the flash off because it creates glare on glossy paper.
• Surface: lay the page flat on a plain surface that contrasts with the paper. Smooth out folds, and press down book pages gently near the spine.
• Position: hold the phone directly above the page, parallel to it. Fill most of the frame, but keep all four corners visible.
• Focus: tap the text on the screen so the camera focuses on the page. Wipe the lens, and hold still for a second after tapping.
• Zoom: move closer instead of using digital zoom, which only enlarges pixels.

Fix skew and cropping

A page that is tilted or cropped unevenly looks unprofessional and is harder to read. In the MZScan scanner, try Auto crop first, then drag the corners by hand if the edges are not exactly right. If the photo is sideways, use Rotate left or Rotate right. Leave a very thin margin of background around the page rather than cutting into the text.

Use the scanner controls in the right order

The scanner offers four modes and four sliders. Work in this order:

1. Pick a mode. Magic Doc suits most printed pages, B&W Scan gives the crispest text for forms and contracts, Grayscale keeps light pencil and soft shading, and Color keeps stamps, coloured ink and photos.
2. Shadow removal evens out hand and phone shadows. Raise it if one side of the page is darker than the other.
3. Whiteness turns a grey or yellow page background white. Raise it a little at a time, because too much can wash out thin lines.
4. Text darkness makes faint print stronger. It helps with light photocopies and thin fonts.
5. Sharpness crisps up soft edges. Use a moderate amount, because too much creates a rough, noisy look around letters.

While you adjust, press and hold Original to compare the result with your untouched photo.

Settings for different documents

• Printed letters and forms: Magic Doc or B&W, moderate whiteness.
• Receipts: B&W with a little extra text darkness, because the print is often faint.
• Handwritten notes: Grayscale or Color so light pencil or blue ink does not disappear.
• Pages with stamps or logos: Color.
• Book pages: Magic Doc with shadow removal, and crop away the curved edge near the binding.

Check readability before you save

Zoom the preview in to 100 percent and read the smallest text on the page. Check numbers carefully (dates, amounts, ID numbers), because they are the first thing to go wrong when a scan is too soft or too harsh. If any digit is unclear, retake the photo rather than pushing the sliders harder.

When you should retake the photo

• The text is blurry because the phone moved or the focus was wrong.
• There is a bright reflection across part of the page.
• A corner or edge is cut off.
• The page is strongly curved or crumpled.

Fixing these in software never gives the same result as a better photo.

Choose the right format when saving

Save as PNG when you want the sharpest text, JPG for smaller files, or use All as PDF to combine several pages into one document. If a website limits the file size, shrink the result with the image compressor. More on formats in PDF vs JPG vs PNG.

Frequently asked questions

Why does my scan look grey?
The paper background is probably dark in the photo. Retake it in brighter, even light, then raise Whiteness a little.

Why do I still see a shadow?
Increase Shadow removal and make sure your hand or phone did not cast a strong shadow when you took the photo.

Is a higher camera resolution always better?
A sharp, well-lit photo matters more than raw megapixels. A blurry high-resolution photo is still blurry.

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