Black Ink Signature Extractor & Contrast Enhancer
Eliminate notebook ruled lines, purge yellow camera shadows, and convert faint or blue ballpoint ink to dense official India Black ink on pure white paper. Pre-configured for SSC (140×60 px), UPSC (350×350 px), IBPS, and Railway RRB application portals.
Ruled Line Eraser
Subtracts horizontal notebook lines without cutting off fine cursive pen flourishes.
Blue-to-Black Ink
Remaps blue and purple ballpoint ink to dense India Black required by recruitment boards.
100% In-RAM Privacy
Your legal handwritten signature is never stored or transmitted to external servers.
Upload Signature Photo or Phone Scan
Works even on lined notebook paper, faint blue ink, or shadowed camera photos. Auto-converts to dense black ink with pure white background.
Official Signature Rules Across Major Indian Recruitment Boards
Verified parameters for online signature uploads across national and state recruitment portals.
| Recruitment Board | Required Dimensions | Permitted File Size | Background Standard | Mandatory Ink Color |
|---|---|---|---|---|
| SSC (CGL, CHSL, MTS) | 140 × 60 pixels | 10 KB to 20 KB | Pure White, Unruled | Black Ink Pen |
| UPSC Civil Services / NDA | 350 × 350 pixels (Square) | 20 KB to 50 KB (up to 300KB) | Pure White, No Shadows | Black Ink Pen |
| IBPS & SBI Banking | 140 × 60 pixels | 10 KB to 20 KB | Pure White, Crisp Strokes | Black Ink Pen (Not CAPS) |
| Railway RRB (NTPC, Group D) | 160 × 80 pixels | 10 KB to 40 KB | Clean White Paper | Black or Blue Ink |
How to Clean and Extract Signatures in 5 Steps
Follow this verified 5-step process for instant recruitment portal compliance:
Upload Signature Photo
Select phone camera snapshot of your signature on paper.
Ruled Line Eraser Active
Automatically detects and erases horizontal notebook lines behind ink.
Blue-to-Black Conversion
Converts faint blue ink into deep, rich black ink required by portals.
Paper Whitening & Binarize
Removes yellow lighting gradients and desk shadows completely.
Download Pure Black Signature
Download verified signature strictly under 20 KB with crisp strokes.
Common Signature Scanning Errors and How Kagazo Fixes Them
Avoid common application mistakes that trigger instant portal rejection:
Signature Disqualified by Portal OCR
Signing on ruled paper interferes with automated verification. Kagazo erases lined patterns.
Mobile Camera Shadow Degrading Contrast
Overhead phone shadows create dark patches. Kagazo normalizes paper luminance.
Over-Thresholding Erasing Fine Curves
Crude binarizers break thin pen lines. Kagazo uses adaptive hysteresis filtering.
Exams Mandating Black Ink Only
GATE, IBPS, and SSC require black ink. Kagazo converts blue ink to solid black.
Recruitment Exam Signature Use Cases
SSC CGL, CHSL, MTS & GD
Extract and format signatures strictly to 140×60 pixels between 10 KB and 20 KB in black ink.
UPSC Civil Services CSE & NDA
Crop signatures into 350×350 px square format with pure white background for UPSC ORA.
IBPS PO, Clerk & SBI Bank Exams
Format cursive signatures strictly between 10 KB and 20 KB in black ink without capital letters.
Railway RRB (NTPC, Group D, ALP)
Clean signatures to 160×80 px strictly under 40 KB for Indian Railway recruitment portals.
TNPSC Group 1, 2 & 4 (OTR)
Format specimen signature to 6.0×2.0 cm strictly between 10 KB and 20 KB for One Time Registration.
Court e-Filing & Legal Affidavits
Clean up handwritten signatures for insertion into legal contracts, affidavits, and job resumes.
Kagazo processes your handwritten legal signature exclusively inside your device’s volatile RAM memory using client-side HTML5 Canvas APIs. Zero signature images or personal biometrics are transmitted over the internet or logged in databases. When you close or refresh this tab, all processed data is permanently erased.
Frequently Asked Questions
Q:Why do SSC and UPSC portals reject signatures on lined notebook paper?
Recruitment portals use automated optical character recognition (OCR) and high-speed biometric signature matching algorithms during exam hall verification. Horizontal notebook lines intersect with cursive letters and cause automated scanning failures, leading to immediate rejection of the uploaded document.
Q:Can I upload a signature written with a blue ballpoint pen?
Yes! While official guidelines mandate black ink, Kagazo mathematically isolates the blue and cyan pigment frequencies and remaps them into dense, official India Black ink (#111111 to #000000) on a pure #FFFFFF background while preserving your natural pen pressure variations.
Q:What are the exact signature dimensions for SSC CGL and UPSC CSE?
SSC requires 140 × 60 pixels strictly between 10 KB and 20 KB in JPEG format. UPSC requires a square 350 × 350 pixels between 20 KB and 50 KB (up to 300 KB allowed). Kagazo provides 1-click presets that automatically apply these exact dimensions and byte constraints.
Q:How does Kagazo remove notebook lines without damaging my signature?
Kagazo’s line-detection filter analyzes repetitive horizontal pixel structures characteristic of machine-ruled notebook paper. It isolates and subtracts these horizontal line frequencies while leaving continuous, irregular handwritten pen strokes completely intact.
Q:Why do bank exam portals (IBPS and SBI) reject signatures written in CAPITAL LETTERS?
A signature must reflect your unique, authentic identity written in running/cursive handwriting. Writing your name in separate capital letters does not constitute a legally binding biometric specimen and is summarily disqualified by banking examination boards.
Q:What is the required background color for government exam signatures?
The background must be pure white (#FFFFFF), completely free of gray shadows, yellowish room lighting tints, paper texture, or visible wood grain from the desk. Kagazo’s adaptive Otsu thresholding whitens the paper automatically.
Q:Can I enhance a signature photographed in dim indoor lighting?
Yes. Smartphone cameras often capture yellowish paper tones and hand shadows in dim rooms. Kagazo analyzes local pixel luminance gradients, eliminates shadows, and boosts ink contrast to flatbed-scanner clarity.
Q:What file format is accepted for signature uploads on recruitment portals?
Almost all Indian recruitment portals (SSC, UPSC, IBPS, RRB, NTA) mandate the JPEG/JPG format. Files in PNG, PDF, or WEBP format are rejected by portal upload validators. Kagazo strictly exports standards-compliant JPEG files.
Q:Will enhancing my signature alter its legal validity?
No. Enhancing image contrast, removing background paper grain, and converting ink color does not modify the curvature, letter slant, pressure points, or unique characteristics of your signature.
Q:Is my handwritten signature saved or stored on your servers?
Never. Kagazo processes all image transformations entirely inside your device’s volatile RAM via client-side HTML5 Canvas. Zero bytes leave your device, and all signature data is permanently erased the instant you close the browser tab.