OldMapsOnline is a free Chrome add-on developed by Klokan Technologies that allows users to automatically find and access historical maps on web pages they visit. With this add-on, users can quickly georeference scanned zoomable maps in various formats and enjoy map overlays, 3D globe view, and other benefits.

One of the standout features of OldMapsOnline is the ability to compare your newly discovered map with over 0.5 million other maps in the OldMapsOnline mapping platform. This allows users to gain a deeper understanding of historical geography and explore different perspectives from various time periods.

With its seamless integration into the Chrome browser, OldMapsOnline makes it effortless to discover and access historical maps while browsing the web. Whether you're a history enthusiast, a researcher, or simply curious about the past, OldMapsOnline is a valuable tool for exploring the world through the lens of history.