GoShawk Extension - Capture Go Diagrams as SGF & HEN
GoShawk Extension
Capture Go board diagrams from any webpage and convert them into SGF or HEN format - directly in your browser.
Chrome Web Store<br>Firefox Add-ons
GitHub
Features
Visual Capture
Click the extension icon, drag to select any area of the page, and GoShawk snapshots it instantly.
SGF & HEN Export
The captured image is analyzed and the board position is reconstructed as SGF or HEN format, ready to use.
Cross-Browser
Supports both Chrome (Manifest V3) and Firefox (≥ 115) with native builds for each platform.
100% Private
Everything runs locally in the browser. No image is ever uploaded or sent to an external server.
How It Works
Activate
Click the GoShawk toolbar icon on any page containing a Go diagram. The page dims and a crosshair cursor appears.
Select
Drag to draw a rectangle around the board image you want to capture. Press Esc to cancel.
Capture
GoShawk crops the selection using the Canvas API (respecting device pixel ratio) and opens a new tab with the SGF/HEN converter pre-loaded with your screenshot.
Export
Use the converter to adjust intersections, verify stone placement, and export the final position as SGF or HEN .