Remove Paper Background from Signatures
NEWExtract a clean, transparent signature from a photo of paper — auto-detects ink with Otsu's method, or adjust manually for perfect results.
Drag a signature photo here, paste from clipboard (Ctrl+V), or
Supports PNG, JPEG, WebP. Upload a photo of a signature on paper to extract a clean transparent PNG.
Original
Transparent Result
Auto mode uses Otsu's method to find the optimal threshold between ink and paper. Adjust Offset to fine-tune.
How to use Signature Background Remover
- Upload or paste a photo of your signature on paper.
- Auto mode finds the optimal ink/paper threshold — use Offset to fine-tune.
- Switch to Manual mode if you prefer direct threshold control.
- Preview the before/after comparison, then download or copy to Signer.
What is Signature Background Remover?
This tool isolates handwritten signatures from paper backgrounds using Otsu's method for automatic thresholding — an algorithm that finds the optimal separation between ink and paper by analyzing the image histogram. Auto mode computes the best threshold automatically and lets you fine-tune with an offset slider. Manual mode gives full control with a direct threshold slider. A Fuzz control softens edges for natural anti-aliasing. Save signatures to your browser for reuse in the PDF Signer tool, or download as a transparent PNG.
FAQ
- What is Otsu's method?
- Otsu's method automatically finds the best threshold to separate two classes (ink and paper) by maximizing the variance between them. It works well for signatures on clean paper.
- Does this work with blue or colored ink?
- Yes — the tool converts to grayscale before thresholding, so any ink color darker than the paper will be preserved.
- How do I use the signature in a PDF?
- Click 'Copy to Signer' to save the signature in your browser, then open the Visual PDF Signer tool — your saved signature will appear there.
Related tools
People also use
- Emoji Background Remover🖼️ Image Tools
Remove the background from an emoji, sticker, or logo — make the background transparent with a single slider. Download as PNG. Free, in your browser.
- Image Background Remover🖼️ Image Tools
Image Background Remover — Erase backgrounds from images automatically or manually. Choose between border color detection, color keying, or brush erasin...
- Add Image Signature to PDF📄 PDF Tools
Upload a photo or transparent PNG of your signature and place it on any PDF page — drag and resize the box to position it exactly. Runs in your browser.
Last updated: