Signature Whitener & Resizer
Remove grey paper shadows from phone photos and compress signatures to strict 10KB–20KB bounds.
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How to scan and clean signature for government exam forms using phone camera
Government exam portals frequently reject applications due to poor signature quality. A common mistake is taking a photo of a signature on a slightly grey or yellow piece of paper with poor lighting. Our tool allows you to upload a regular smartphone photo of your signature, and it automatically removes the grey paper shadows, converting the background to pure white while making the pen ink darker and crisper.
Steps:
1. Sign on a clean, unlined white paper with a blue or black ballpoint/gel pen.
2. Take a clear photo near a window for natural light.
3. Upload it here, crop the signature tightly.
4. Adjust the Paper Whitener slider until the background is pure white.
5. Download the strictly compressed (10KB–20KB) ready-to-upload file.
Official Signature Dimensions Table
| Exam Portal | Size Limit | Dimensions (Pixels / CM) |
|---|---|---|
| SSC (CGL, CHSL, GD, MTS) | 10 KB – 20 KB | 4.0 cm x 2.0 cm (Approx 140x60 px) |
| UPSC | 20 KB – 300 KB | Min 350x350 px (1:1 Ratio usually accepted) |
| IBPS (Banking) | 10 KB – 20 KB | 140 x 60 pixels |
| Railway RRB | 10 KB – 40 KB (Varies) | 140 x 60 pixels (Standard 3:1) |
Common Signature Rejection Reasons
- Grey/Dark Backgrounds: Shadows from mobile flashes or poor room lighting cause the paper to look grey. This is the #1 rejection reason. Our Paper Whitener fixes this instantly.
- Blurry / Pixelated Image: Signing too small and then stretching the crop causes pixelation. Always sign largely on the paper.
- Wrong Ink Color: Most exams mandate Blue or Black ink. Red or green ink is strictly prohibited.
- File Size Too Large/Small: The file must fall precisely within the KB brackets (e.g., exactly between 10 KB and 20 KB). Our compressor guarantees this output.
Frequently Asked Questions
Q: Is my signature uploaded to your server?
A: No. Your signature is processed entirely on your own device (client-side in your web browser). It is never sent to our servers, ensuring 100% privacy and security.
Q: What is the difference between 'Black & White' and 'Preserve Blue' ink modes?
A: Black & White mode converts the entire signature to grayscale, darkening the ink to black and forcing the paper to white. Preserve Blue mode retains the blue color of a ballpoint/gel pen while still pushing the grey paper shadows to pure white.
Q: Why does the signature look slightly lower quality after processing?
A: Squeezing a high-resolution phone photo into a strict 20KB or 10KB limit requires aggressive JPEG compression. The file will look slightly artifacted, but this is expected and perfectly acceptable for official government portals.