About JstScan

A free document scanner that runs entirely in your browser. No app install. No ads. No upload.

Point your camera at a document, and JstScan automatically detects edges, corrects perspective, and enhances the image for a clean, professional scan. Combine multiple pages into a single PDF, all without your documents ever leaving your device.

How It Works

• Camera captures your document
• OpenCV.js detects document edges in real-time
• Perspective correction flattens the image
• Enhancement filters clean up the scan
• pdf-lib combines pages into a downloadable PDF

Technology

Built with Rails 8, Stimulus, OpenCV.js (computer vision), and pdf-lib (PDF generation). Everything runs client-side in your browser using WebAssembly.

Built by GoTabs.