Why did my signature get rejected on the SSC portal?

The Staff Selection Commission (SSC) uses an automated image scrutiny algorithm. Mobile phone photos almost always contain a yellowish tint, shadow gradients, or grayish paper tones. SSC requires a crisp signature in black ink on pure white paper (#FFFFFF) with dimensions of 200 x 50 pixels and file size between 10 KB to 20 KB. If the background contains gray noise or RGB values lower than 250, automated screening algorithms flag it as blurred or invalid.

What is the official signature size requirement for UPSC Civil Services & OTR?

For UPSC Online (OTR and application forms), the applicant signature must be in JPG format, with dimensions of 140 pixels width by 60 pixels height (or aspect ratio matching ~7:3), and file size strictly between 20 KB and 100 KB. The signature must be legible with a pure white background.

Can I upload a thumb impression taken in blue or purple ink?

Yes! While candidates commonly use blue or purple ink stamp pads for their Left Thumb Impression (LTI), recruitment portals prefer or convert it to high-contrast black and white for automated biometric pattern matching. This tool intelligently separates the blue/purple ink pigment from paper shadows and converts the ridges to pure solid black (#000000) on pure white (#FFFFFF), preventing automated OCR and verification failures.

What is the difference between pure B&W (#FFFFFF / #000000) and grayscale?

A grayscale image contains 256 shades of gray. Paper texture, phone shadows, and camera grain remain visible as light gray pixels. In contrast, pure Black & White (1-bit binarization) forces every single background pixel to absolute white (#FFFFFF - rgb(255,255,255)) and every ink stroke to absolute black (#000000 - rgb(0,0,0)). This completely eliminates shadows, yellow casts, and grain.

Is it safe to upload my signature and thumbprint to this tool?

Yes, 100% safe. This tool operates entirely inside your web browser using HTML5 Canvas client-side technology. Your biometric thumbprint and signature images are never uploaded to any server or stored in any database. You can even disconnect your internet after loading the page and the tool will continue working perfectly.

How does the stroke thickening (dilation) feature help prevent rejection?

When signatures written with thin ballpoint pens or light thumb impressions are converted to black and white, delicate line segments can break or appear faint. The stroke dilation feature subtly reinforces line continuity and ridge thickness by 1 pixel, making the signature clear, unbroken, and readily readable by automated scanners.

Govt Job Signature & Thumb Impression Enhancer | Pure B&W Converter (#FFFFFF Background)

100% In-Browser Pure B&W Converter (#FFFFFF Background) Zero Server Upload • 100% Private

Govt Job Signature & Thumb Impression Enhancer

Convert mobile camera photos with yellowish paper, shadows & blue ink into official Pure Black & White (#FFFFFF background, #000000 ink). Passes automated verification on SSC, UPSC, IBPS, RRB & State PSC portals without rejection.

Drag & Drop Your Signature or Thumb Impression Here

Supports JPG, JPEG, PNG, WEBP from your phone or scanner. You can also paste (Ctrl + V).

Accepts Signatures & Left Thumb Impressions (LTI) 🔒 Privacy First: Processed 100% on your device

No file on hand? Test 1-click magic with sample:

signature-photo.jpg AUTO CLEANED

Pure B&W Algorithm Applied • Absolute #FFFFFF Paper Background

LEFT: Original Camera Photo

Drag Slider to Wipe & Inspect Pure White Background

RIGHT: Pure B&W (#FFFFFF)

ORIGINAL

PORTAL-READY: PURE B&W

💡 Tip: Click and drag the green handle across to compare background clarity

Govt Exam Dimension Presets

1-Click official dimensions for automated portal scanning

Auto-Crop & Fit

Dimension Fine-Tuning Maintain Aspect Ratio (Letterbox on #FFFFFF)

Target Width (px)

Target Height (px)

Auto-Trim Margin

Rotate 90°

Portal Target File Size (KB Optimizer) Target: 10 KB – 20 KB (SSC Pass)

Portal Verification Checklist

ALL PASSED

Output Format .JPG (JPEG)

Background Color #FFFFFF (100% Pure White)

Ink Color & Contrast #000000 (Pure Black)

Dimensions 200 × 50 px

Calculated File Size ~ 14.8 KB (Passed)

EXIF & GPS Privacy Stripped Clean

Save Application Rejection - Share Tool on WhatsApp

The #1 Reason for Form Rejection

Mobile cameras take photos in warm room light with yellow paper and gray shadows. Portal OCR bots scan for #FFFFFF background; any pixel variance causes instant automated disqualification.

Pure B&W vs Grayscale

Grayscale retains 256 shades of blurry gray paper textures. Our tool executes binary thresholding: 100% pure white (#FFFFFF) paper and pure black (#000000) ink.

Thumbprint Ridge Protection

Left Thumb Impressions (LTI) in blue or purple stamp ink are transformed into high-contrast black friction ridges without smudging delicate loops and whorls.

Govt Exam Signature & Thumbprint Dimension Cheat Sheet (2026)

Official dimensions, required file formats, and strict KB file size limits for top Indian recruitment portals

Updated for 2026 Portals

Recruitment Agency / Exam	Document Type	Required Dimensions	File Size Limit	Background & Ink
SSC (CGL, CHSL, MTS, GD, CPO)	Candidate Signature	200 × 50 px (4:1)	10 KB – 20 KB	Pure White (#FFFFFF) / Black Ink
UPSC (Civil Services, OTR, NDA, CDS)	Applicant Signature	140 × 60 px (7:3)	20 KB – 100 KB	Pure White (#FFFFFF) / Black Ink
IBPS (PO, Clerk, SO, RRB)	Signature (White Paper)	140 × 60 or 160 × 70 px	10 KB – 20 KB	Pure White / Black Ink Only
IBPS / SBI / Railways (LTI)	Left Thumb Impression (LTI)	100 × 100 px (1:1)	20 KB – 50 KB	Pure White / High Contrast Black
Railway Recruitment (RRB NTPC, ALP)	Applicant Signature	200 × 50 or 140 × 60 px	10 KB – 40 KB	Pure White Background (#FFFFFF)
DSSSB / Delhi Govt	Signature & Thumbprint	140 × 110 px / 110 × 140 px	Under 40 KB	White Paper with Dark Ink
UPSSSC / UPPSC (PET, RO/ARO)	Signature & Thumbprint	200 × 200 px (or Joined)	Under 30 KB	Absolute White Background
BPSC / Bihar Police / CSBC	Hindi / English Signatures	200 × 100 px	15 KB – 25 KB	Black / Blue ink on Clear White

Pro Tips: How to Click the Perfect Mobile Photo of Signature & Thumbprint

Use Plain White Paper

Sign on unruled (blank) printer A4 paper. Avoid lined notebooks, rough newsprint, or colored notepads.

Black Gel or Thick Ball Pen

Sign with a dark black or dark blue pen with solid ink flow. Do not use pencils, highlighters, or faint sketch pens.

Even Daylight (Avoid Hand Shadow)

Snap near a window during daytime. Keep your phone parallel to paper so your hand does not cast a dark shadow.

Run Through This 1-Click Tool

Drop the photo here. Our algorithm strips paper yellowing, generates pure #FFFFFF background, and locks exact KB size.

Frequently Asked Questions (FAQs)

Official government portal rules and image specifications answered

MySarkariNaukri Tools