Clean Document Scanner & Xerox Binarizer Free
Transform smartphone photos of certificates, marksheets, and receipts into crisp, shadow-free, flatbed-quality documents. Remove camera glare, paper creases, and yellow incandescent tint in seconds.
Upload Marksheet, Certificate or Xerox Photo
Snap a picture with your phone. We eliminate desk shadows, remove yellow bulb tints, and boost ink contrast.
Shadow Removal & Adaptive Contrast Thresholding
Photos captured on mobile phones suffer from hand shadows, perspective skew, and room lighting gradients. Kagazo applies computer vision algorithms to binarize text and produce clean photocopy-grade scans.
Eliminates overhead phone silhouettes and uneven lighting gradients across paper.
Converts grayish photocopies into high-contrast black text on pure white background.
Sensitive certificates and identity documents never leave your personal computer.
Government Portal Document Clarity & Lighting Standards
Verification guidelines enforced during document scrutiny phases:
| Authority / System | Document Type | Portal Limit | Calibrated Target | Processing Rule |
|---|---|---|---|---|
| UPSC Civil Services & ORA | Matriculation & Degree Certificates | Clear White Background | Shadow-Free Scan | Must not contain desk textures, fingertips, or heavy camera shadows. |
| TNPSC OTR Portal | 10th & 12th Marksheets (Both Sides) | High Legibility | Pure Binarized Text | All subject marks, registration numbers, and signatures must be crisp. |
| SSC CGL / CHSL / MTS | Category & Educational Proofs | Legible Stamp & Seals | Enhanced Ink Contrast | Official issuing authority seals must not be obscured by lighting glare. |
| Banking & Insurance (IBPS/LIC) | Handwritten Declarations & Resumes | High Contrast Text | Black Ink on White Paper | Ensures automated optical character recognition (OCR) indexing succeeds. |
Technical Advisory: Recruitment portal scrutiny committees frequently reject documents if desk background or phone shadows obscure official stamps or serial numbers.
How to Clean Document Scans in 5 Steps
Follow this verified 5-step process for guaranteed portal compliance:
Upload Mobile Photo
Select the phone camera photo of your marksheet, certificate, or receipt.
Select Processing Filter
Choose "Clean Color", "Xerox Photocopy", or "High-Contrast B&W" filter.
Adjust Shadow & Brightness
Fine-tune threshold sliders to whiten background paper while keeping ink dark.
In-Memory Stream Processing
The computer vision filter processes pixels in client-side RAM instantly.
Download Clean Document
Inspect using the clarity loupe and download as a high-resolution PDF or JPEG.
Common Document Conversion Errors and How Kagazo Fixes Them
Avoid common conversion mistakes that cause portal upload rejections:
Camera Shadow Obscuring Student Details
Taking photos directly from above casts phone shadows. Kagazo equalizes illumination levels.
Warm Bulb Tint Causing Scrutiny Failure
Indoor lighting gives paper a yellow or orange cast. Kagazo whitens paper back to pure white.
Wood Grain or Bedspread Around Document
Uncropped photos fail automated OCR verification. Kagazo crops to document boundaries.
Over-Thresholding Erasing Fine Pen Strokes
Generic binarizers break thin signatures. Kagazo uses adaptive hysteresis thresholding.
Frequently Asked Questions
Authoritative answers regarding format conversions, document quality, and portal standards:
Why do recruitment portals reject photos taken with mobile cameras?
Government exam portals use automated OCR and document indexing tools. Mobile camera photos often have uneven lighting, dark hand/phone shadows, yellow indoor light tints, or curled desk edges. These make small printed numbers unreadable by automated systems.
How does the shadow removal filter work?
Kagazo uses local background luminance estimation. It detects low-frequency brightness gradients across the paper and normalizes them, brightening shadowed corners while preserving dark ink text.
Will official rubber stamps and colored seals be preserved?
Yes! The "Clean Color" mode whitens background paper while preserving blue, purple, and red stamp ink, ensuring the document looks authentic and official.
What is Xerox Binarize mode?
Xerox Binarize mode converts the document into high-contrast black and white, perfectly replicating a professional flatbed photocopy machine while removing all paper yellowness and background noise.
Can I export the cleaned document as a PDF?
Yes. You can export the cleaned result as an A4 formatted PDF or as a high-resolution JPEG image.
Are my certificates uploaded to any server?
Never. All computer vision and image processing algorithms run 100% locally in your browser memory via WebAssembly and Canvas. Zero documents leave your device.
Can I clean multi-page marksheets or certificates?
Yes. You can upload multiple pages, apply uniform cleaning filters across all sheets, and download them as a unified PDF.
Does Kagazo add any watermark to the cleaned scan?
No. All documents generated by Kagazo are 100% clean and watermark-free.
Does this work on wrinkled or folded certificates?
Yes. The adaptive contrast algorithm smooths out crease shadows and fold marks, producing a flat, clean appearance.
Can I use this tool directly from my phone camera?
Yes. You can snap a photo directly from your smartphone browser and clean it in seconds without installing any mobile app.