Remove Shadow from Document Online Free

Eliminate annoying mobile phone shadows, uneven lighting gradients, and grayish backgrounds from certificates, marksheets, and IDs. Auto-detect document edges, whiten paper, and export clean PDFs ready for official verification.

Scan a Document

Scan documents vertically using your mobile camera or upload a photo. Auto-detect edges, flatten perspective, and export to multi-page PDF.

Vertical scanning•Auto edge detection•Rotate & crop•Multi-page PDF•100% Client-Side

Shadow & Glare EraserEliminates camera hand & phone shadows

Clean White Paper ContrastWhitens background & sharpens text

100% Private in BrowserZero uploads, works completely on-device

Why Phone Camera Shadows Cause Document Verification (DV) Failures

When taking a quick smartphone photo of an educational marksheet, Aadhaar card, or government certificate, overhead lights naturally project a dark shadow of your hands or phone onto the paper. On government exam portals like SSC CGL, UPSC Civil Services, and state police recruitment boards, high-speed automated document screening algorithms reject shadowed scans as illegible or tampered.

❌ Unprocessed Photo with Shadows

Dark shadow gradient across marksheet roll numbers
Skewed perspective angles caused by holding phone diagonally
Tablecloth or bedsheet texture visible in background
Automated portal OCR fails to extract certificate details

✅ SizeSnap Shadow-Removed Output

Pure white paper background with zero shadow gradients
Flatsheet perspective correction equivalent to flatbed scanners
Clean, dark ink lines for signatures, seals, and text
Guaranteed acceptance on SSC, UPSC, and state recruitment portals

How to Whiten Paper & Remove Shadows in 3 Easy Steps

Upload or Snap: Choose a photo of your certificate or tap "Start Camera" to take a live photo.
Adjust Corners: SizeSnap automatically highlights document edges. Adjust the 4 corner handles to isolate the paper from background objects.
Apply "Remove Shadow (B&W)": Click the magic wand button on the preview screen. Dark shadows instantly turn to bright white paper, and dark text is sharpened.

Frequently Asked Questions

Q.How does the SizeSnap Shadow Remover remove dark shadows from document photos?

When you capture a document with your smartphone, your hands or phone often cast dark shadows across the paper. SizeSnap uses two intelligent steps: (1) Computer Vision (OpenCV) detects the four corners of your document to crop away unwanted dark tables, bedsheets, and surrounding shadows; (2) The "Remove Shadow (B&W)" algorithm analyzes luminance gradients, stretches contrast to turn grayish shadowed areas into pure clean white paper, and enhances dark ink vectors so handwriting and stamps become razor-sharp.

Q.Why do recruitment portals (SSC, UPSC, State PSC) reject documents with shadows?

Government job portals utilize automated Optical Character Recognition (OCR) software and strict manual document verification (DV). When a marksheet or caste certificate has dark shadows or uneven lighting, automated scanners fail to read roll numbers, birth dates, and serial codes, resulting in instant application rejection. Removing shadows guarantees 100% legibility.

Q.Can I remove shadows from multi-page PDFs or marksheets?

Yes! You can upload or scan multiple pages sequentially. For each page, click "Remove Shadow (B&W)" on the preview screen to whiten the background and eliminate shadows. You can reorder, rotate, or re-scan any page, and then export all clean pages together as a single multi-page PDF.

Q.Is my confidential Aadhaar card or marksheet uploaded to any server?

Never. SizeSnap operates 100% locally inside your web browser using HTML5 Canvas and WebAssembly. Your photos, certificates, and documents are processed entirely on your phone or computer and are never uploaded to any remote server or stored in any database.

Q.What is the best way to avoid casting shadows while taking document photos?

For best results: (1) Place the document near a natural light source like an open window rather than directly underneath a single overhead ceiling light; (2) Hold the phone slightly tilted if necessary and use SizeSnap perspective correction to flatten it automatically; (3) Zoom in 1.5x–2x from a slightly greater distance so your hands do not block the light.

Q.Can I switch back to color if I do not want pure black & white?

Yes. The "Remove Shadow (B&W)" button acts as a toggle. Clicking it once applies adaptive shadow removal and contrast enhancement. Clicking it again instantly restores the full-color scan without losing your perspective crop.