How to Scan a Signature Properly for Exam Upload

Signatures are often the hardest document to get right for exam upload — lighting, ink visibility, and cropping are all critical. Here's how to do it correctly.

Hardware Options

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Recommended: Smartphone + Lighting

Most candidates have a smartphone but no scanner. If your phone's camera is decent (any modern iPhone or Android), you can get a valid signature with proper setup:

1. Lighting: Place your signature under a bright lamp or window (daylight). Shadows make signatures too light.
2. Angle: Hold the phone camera perpendicular (straight down), not at an angle.
3. Background: Use plain white paper; avoid yellowed or colored paper.
4. Distance: Fill the frame with just your signature and a small margin. Close-up is better than zoomed-out.

Step-by-Step: Smartphone Scanning

1. Write your signature in black ink on white paper (same ink you'll use on exam day).
2. Place under bright light (lamp, window, or daylight).
3. Open a scanning app if available (iPhone: Notes → Scan Documents; Android: Google Drive → Scan), or use the normal camera.
4. Align the phone so the signature fills the viewfinder with a 1cm margin.
5. Take the photo, review for clarity and contrast.
6. Crop and rotate if needed so the signature is level and centered.
7. Upload to kbsnap.in with any adjustments (brightness, contrast, cleanup threshold).

Common Smartphone Mistakes

• ❌ Bad lighting (shadow on signature): Signature appears too light, fails portal's contrast check → Rejected
• ❌ Angle (phone held at 45°): Signature appears skewed or distorted → Rejected
• ❌ Too far away: Signature is small in the frame; cropping to 400×200px loses detail → Rejected
• ❌ Colored paper (cream, yellow): Portal's contrast check fails (expects white background) → Rejected
• ❌ Glare or reflection: White areas blow out, signature details lost → Rejected

Adjustments After Capture

Use kbsnap.in's adjustment sliders:

• Brightness: If signature is too light or dark.
• Contrast: If signature merges into the background.
• Signature Cleanup Threshold: Cleans up grey shadows from the paper and darkens faint ink (default 235, adjust down if too aggressive).

Pro Tip: Use a Signature Reference

Some candidates sign differently every time. For exam upload:

1. Practice your signature 5–10 times on paper with your exam-day pen.
2. Pick the one that looks best and most professional.
3. Scan that one signature.
4. Use the same signature when you sign documents at the exam center (consistency matters for fraud prevention).