Create 100% Transparent Electronic Signatures & Clean Document Scans Offline
Whether you need to sign a PDF contract, insert an executive signature into Microsoft Word, or print a smartphone photo of a paper receipt without wasting black toner on gray shadows, this dual-mode workbench runs entirely inside your browser:
- Mode 1 — Transparent Signature & Stamp Extractor: Uses adaptive local luminance & chroma thresholding to isolate black, blue, or red ink from uneven paper backgrounds, complete with anti-aliased edge feathering, stroke boldness dilation (
+1px/+2px), and a live contract signing preview. - Mode 2 — Document Scan Shadow Whitener: Eliminates phone shadow gradients from photographed documents and contracts while optionally preserving red official seals in full color.
Frequently Asked Questions (FAQ)
Q1 Why does a smartphone photo of my signature have a gray background in Word or PDF?
When you photograph white paper under indoor lighting, shadows from your phone and uneven ambient light turn the paper pixels into varying shades of gray (#C5C2BB to #E8E6E1). Our tool computes a local Integral Image (Summed-Area Table) to estimate background illumination per pixel, stripping 100% of the paper texture into a pure Alpha=0 transparent background while keeping ink strokes sharp.
Q2 Is my handwritten signature or company stamp uploaded to any server?
No. Handwritten signatures and corporate seals are sensitive legal identifiers that should never be uploaded to third-party cloud background removers. This workbench processes every pixel locally inside your browser RAM using HTML5 Canvas and TypedArrays.
Q3 How does Mode 2 (Document Scan Shadow Whitener) fix dark phone photos of contracts?
Mode 2 divides each pixel by its local neighborhood mean luminance (homomorphic lighting normalization). This completely flattens curved page shadows and camera flash hotspots into pure #FFFFFF white paper while darkening text strokes for crisp laser printing.