署名抽出ツール - 背景削除

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Upload a photo of your signature to begin.
Works best on plain white paper.

Frequently Asked Questions

How do I extract my signature?

Take a photo of your signature on white paper, upload it, and the tool removes the background, leaving just the signature with transparency.

What format is the output?

PNG with transparent background - perfect for inserting into Word documents, PDFs, or digital contracts.

Will it work with a phone camera?

Yes! Just photograph your signature in good lighting on plain paper. The AI handles the rest.

Why Use a Local Signature Extractor?

1. Total Security & Privacy

Your signature is highly sensitive personal data. Uploading it to a random cloud-based background remover exposes you to identity theft and forgery. This tool processes the image locally in your browser. Once the page is loaded, you can even disconnect from the internet and it will still work perfectly.

2. Luma-Based Thresholding

Standard background removers aren't designed for thin ink lines"they often delete parts of your signature or leave blurry grey artifacts. Our algorithm specifically targets the Luma (brightness) of the paper, instantly dropping out the background and enhancing the contrast of the ink.

3. Perfect for Digital Documents

Whether you need to sign a PDF in Adobe Reader, add your signature to a Google Doc, or attach it to a Pan Card application, having a crisp, transparent PNG is essential. No more grey boxes ruining your formal documents.

How it works:

Step 1: Sign your name securely on a blank piece of white paper using a dark pen.

Step 2: Snap a photo with your phone (ensure good lighting with minimal shadows).

Step 3: Upload the image here. Use the slider to dial in the perfect background removal.

Step 4: Download the auto-cropped PNG directly to your device.

ペーパーよりデジタル署名抽出ツール