About Signature Extractor & Transparent PNG Maker
Convert phone photos of signatures written on paper into clean, high-contrast, transparent PNG files. Automatically removes paper background shadows, yellow lighting, and grain, with customizable ink colors (pure black, royal blue, or original pen).
Key Capabilities & Features
- Otsu thresholding and sensitivity sliders for crisp ink strokes
- Color customization: Pure Midnight Black, Royal Executive Blue, or Enhanced Original
- Automatic tight bounding-box cropping with padding
- 1-click copy transparent image directly to clipboard
- High-resolution PNG download ready for DocuSign, PDFs, and Word documents
How to Use Signature Extractor & Transparent PNG Maker
Upload Paper Signature
Take a picture of your handwritten signature on white paper.
Adjust Contrast & Color
Select Pure Black or Royal Blue, and fine-tune threshold if needed.
Copy or Download PNG
Download your transparent signature ready to paste onto any PDF or contract.
Privacy & In-Browser Execution Guarantee
100% Client-Side. Signature extraction and transparency processing occur strictly inside your device browser memory.
Frequently Asked Questions
Will the paper shadows be removed?
Yes. The algorithm isolates pen ink based on adaptive luminance thresholding and sets paper pixels to 100% transparent.
Can I use this for official digital contracts?
Yes. The exported high-resolution PNG is transparent and suitable for insertion into DocuSign, Adobe Acrobat, Word, or Google Docs.