Free tool to mark points and polygon regions

For a game I'm developing I needed an easy way to create hotspot areas on images. So I hacked together a small tool to do so and before I knew it, I had created an entire app :-) It allows you to generate JSON or YAML from the coordinates you tack on the image. tack runs entirely in your browser, there is no server side component to it, so good in terms of privacy. Hope this is helpful.

Visit tack.pics ↗Alternativestop 5% of May 2026

In plain words

Tack is a browser-based tool for game developers and designers to mark points and polygon regions on images. Users place markers to define hotspot areas, then export the coordinates as JSON or YAML data. The application runs entirely in the browser with no server component, keeping all data private. It's designed to streamline the process of creating interactive area definitions for game development.

written from the facts on this page · September 2026

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