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An open-source, web-based viewer for zoomable images, implemented in pure JavaScript.

See it in action and get started using it at

Stable Builds

See the GitHub releases page.


If you want to use OpenSeadragon in your own projects, you can find the latest stable build, API documentation, and example code at If you want to modify OpenSeadragon and/or contribute to its development, read the contributing guide for instructions.


OpenSeadragon is released under the New BSD license. For details, see the LICENSE.txt file.