Enhance Scan Contrast

Enhance Scan Contrast is built for documents where the text is present but hard to read: a faded paper original, a low-contrast photocopy, or a phone photo taken in dim light where the page looks gray and muddy. By raising brightness, contrast, and sharpness independently, you can lift faint type away from the background so it reads cleanly on screen or in print.

It fits a handful of concrete workflows. For office and admin work, it makes a faded scan or a dark document photo legible before you file or forward it. For receipt and expense handling, it lifts thermal-paper or crumpled-receipt photos enough that amounts and dates are readable. For archive prep, a cleaner, higher-contrast page reproduces better when you later bundle scans into a PDF or a ZIP for storage.

It is also a useful pre-OCR step. Text-recognition tools generally read sharper, higher-contrast pages more reliably, so running a faint scan through here first can improve the result before you send it to an image-to-text or searchable-PDF tool.

Drop or select a JPG, PNG, or WebP image up to 30 MB. You then adjust three separate sliders (brightness, contrast, and sharpness) or pick a preset tuned for a common case: standard document, receipt, low-light photo, or faded paper. Press Enhance contrast and a before/after slider shows the change; if it went too far or not far enough, Change settings takes you back to the sliders with the same file. The result downloads as a PNG named after your file with an -enhanced suffix.

Everything runs in your browser; nothing is uploaded or kept after you close the tab.

Be clear about what it does not do. It only adjusts tone and edge contrast on a single raster image, and it keeps the colors; it does not crop, deskew, remove backgrounds, recognize text, or output a PDF. To combine enhanced pages into one PDF, run them through Scan to PDF afterwards; for grayscale or black-and-white output, use Clean Document Scan or Black & White Scan instead.

The biggest misconception is that sharpening fixes blur. It does not. Sharpening only firms up slightly-soft text; if the original is genuinely out of focus or motion-blurred, no slider will recover the lost detail, because the tool cannot add information that was never captured.

Over-cranking is the common mistake. Pushing contrast too far crushes light strokes and shadows into solid black or blank white, and very high sharpness creates visible halos or jagged outlines around letters. A receipt preset applied to a normal printed page, or vice versa, can also exaggerate noise. Work up gradually and check the before/after slider rather than maxing the sliders.

Keep the 30 MB limit and supported inputs in mind (JPG, PNG, and WebP only), and note that output is always PNG: it keeps every adjusted pixel without new compression, but a large color page can be a heavier file than the JPG photo you started with.

Compare against the original using the before/after view and confirm the real goal: every line of body text, small print, and handwriting is readable, not just the headings. Check the darkest and lightest areas for clipping, text should not have vanished into pure black or washed out into white, and look closely at letter edges for halos or speckle introduced by sharpening. Zoom to full size, since problems that hide at preview scale show up at 100 percent.

If the enhanced page is feeding another step, sanity-check it there: run a short OCR pass or open the page where it will ultimately be used and confirm it holds up. Then verify the saved file opens correctly and is a size you can use.

For contracts, invoices or IDs, confirm no digit, signature or clause became ambiguous, and keep the original.