Release Oct 3, 2026: E-Signature Capture AddonCopy Anchor Link

We are thrilled to announce the official release of the E-Signature Capture Addon for CustomGForm.

Google Forms has never had a native signature field. Respondents either had to awkwardly type their name or print, sign, scan, and upload a document—which forced a Google sign-in barrier.

With CustomGForm v1.4.0, you can now collect legally binding electronic signatures seamlessly on any public Google Form.

Interactive Live DemoCopy Anchor Link

Try signing the Non-Disclosure Agreement (NDA) form live below:

Key CapabilitiesCopy Anchor Link

• Smooth Bézier Vector Curves: Velocity-sensitive stroke interpolation powered by signature_pad delivers realistic handwritten signatures.
• High-DPI / Retina Canvas Scaling: Prevents pixelation or blurry signatures on mobile devices with automatic device pixel ratio scaling (window.devicePixelRatio).
• In-Cell Google Sheets Rendering: Injects an =IMAGE("https://...") formula into your Google Sheet so signature images display directly inside spreadsheet rows.
• Mobile Touch Gesture Lock: touch-action: none locks viewport scrolling while drawing, preventing accidental screen dragging.
• Cloudflare R2 Storage: Signatures are securely stored and delivered over high-speed global CDN with unique, collision-proof file paths.
• Dark Mode Adaptation: Automatic stroke color inversion ensuring high contrast on both light and dark themes.

Links & ResourcesCopy Anchor Link

• Live showcase: E-Signature Form Showcase
• Complete setup guide: How to Collect Signatures with Google Forms
• Feature documentation: E-Signature Capture
• AI & MCP Tools: Connect CustomGForm to AI Agents via MCP