Photos of documents, receipts, handwritten notes, and sketches captured with smartphones frequently suffer from uneven hand shadows, dim room lighting, and yellowish paper tint. This tool converts casual phone snapshots into clean, readable flatbed scans without requiring heavy desktop imaging software.

The utility draws your image onto an HTML5 canvas and runs an adaptive local background thresholding algorithm. It identifies ambient paper brightness variations, whitens background pixels to pure clean white, and intensifies ink strokes to deep black. You can choose between high-contrast black-and-white mode or color-preserved mode, and adjust cleaning sensitivity and contrast in real time. Processing occurs exclusively in client-side canvas memory with zero server uploads.

How to Use

1
Upload or drag your phone camera document photo into the scanner.
2
Adjust the cleaning intensity and contrast sliders to balance shadow removal with text clarity.
3
Select high-contrast black-and-white mode for printed text or color mode for diagrams.
4
Preview the cleaned document scan on screen and download your processed PNG.

Frequently Asked Questions

How does the tool eliminate hand shadows from phone photos?

It estimates local background luminance across the document image and selectively scales brightness thresholds, neutralizing gradated shadows while keeping ink pixels sharp.

What is the difference between black-and-white and color modes?

Black-and-white mode converts all detected ink to crisp monochrome for maximum readability and printing economy. Color mode whitens paper backgrounds while preserving colored ink, stamps, or illustrations.

Are my uploaded receipts or personal documents stored on a server?

No. All canvas filters and image downloads execute 100% locally in your browser session. Your documents are never uploaded to any remote server.

Phone-Scan Paper Whitener & Shadow Eraser