A Universal Viewer (UV) link can be generated by pasting a iiif manifest into the UV demo site:
https://universalviewer.io/uv.html?manifest=[manifest url]
Example:
https://universalviewer.io/uv.html?manifest=https://media.library.ohio.edu/iiif/2/lynnjohnson:728/manifest.json
To embed the viewer, paste the adapted URL into the following source code:
<center><iframe src="https://universalviewer.io/uv.html?manifest=https://media.library.ohio.edu/iiif/2/lynnjohnson:728/manifest.json" width="800" height="600" frameborder="0" allowfullscreen="allowfullscreen"></iframe></center>
You can specify the width and height parameters of the embedded viewer by changing those values in the code. The Universal Viewer works well with the following standard dimensions (W x H): 800 x 600, 640 x 480, 520 x 420
If the item has multiple images, you can specify which will display within the URL parameters, as well as the zoom level. First open the UV demo URL with your appended manifest:
https://universalviewer.io/uv.html?manifest=https://media.library.ohio.edu/iiif/2/lynnjohnson:728/manifest.json
Select the page, and zoom to the area you would like to display. In the lower left corner of the viewer, click the share icon. The provided link will contain additional parameters to specify the page and zoom level, as shown below.
Example:
https://universalviewer.io/uv.html?manifest=https://media.library.ohio.edu/iiif/2/lynnjohnson:728/manifest.json#?c=0&m=0&s=0&cv=27&xywh=1161%2C545%2C1562%2C800