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Overview
Create and maintain UML diagrams in your Google Docs and Slides. The diagrams are drawn by PlantUML, a text-based UML diagramming tool, and inserted into your Google Docs as images. You don't need to spend time with the layout of your diagram; PlantUML takes care of that thanks to Graphviz algorithms. The PlantUML source text is encoded within the link of the image in Google Docs, so you can edit it later and re-insert the diagram using PlantUML Gizmo. There are some sample diagrams in PlantUML Gizmo to help you get started.
Create and maintain UML diagrams in your Google Docs. The diagrams are drawn by PlantUML, a text-based UML diagramming tool, and inserted into your Google Docs as images. You don't need to spend time with the layout of your diagram; PlantUML takes care of that thanks to Graphviz algorithms. 

The PlantUML source text is encoded within the link of the image in Google Docs, so you can edit it later and re-insert the diagram using PlantUML Gizmo.

There are some sample diagrams in PlantUML Gizmo to help you get started.
Reviews
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Aleksander Stelmaczonek
January 11, 2021
Awesome. With this, I can include and edit my PlantUML diagrams without leaving Google Docs. The only shortcomings are as pointed out by Mark Grand, some of which are outside of the Author's control.
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Mark Grand
December 30, 2020
I have found this very helpful. It allows me to include plantUML drawings embedded in my docs, which is very useful. It does have some shortcomings: * It uses an editor for the plantUML that uses a text box whose size can be adjusted vertically, but not horizontally. * It is not very smart about the dimensions of the diagram. It will allow the height of the diagram to be taller than the page. If I change the orientation of a page from portrait to landscape so that a drawing will fit, it does not take advantage of that. Despite these two things, I am very happy to have this add-on for Google Docs.
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Samson Assefa
December 2, 2020
Samson Assefa Gebrehiwot
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A User of PlantUML Gizmo
March 24, 2020
This is an attempt to include PlantUML in Docs and Slides... However no editor is included and it does not allow one to save the .plantuml files on Google Drive, and refer to those from within the Docs and Slides apps. The editor used is PlanyUML org, which is fine - IF it allowed to save the source to Google Drive. All in all, it's useful if your're in a hurry, but not smart if you want to reuse your PlantUML source.
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A User of PlantUML Gizmo
February 19, 2020
I'd like to use, but it may not be functional for the latest Google Docs. The "Edit Settings" is not functioning, so you cannot add the PlantUML server. There were also errors about authorization. If I can get some help/clarification I'll try it again.
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A User of PlantUML Gizmo
June 5, 2019
So good, it helped me collaborate on school engineerin work. A big timesaver, awesome coolness and easying life tool!
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Mike West
June 25, 2017
I tried to create a UML class diagram but this tool seems limited to a single row and I quickly ended up with an unusable, very wide diagram. It's a nice idea, but perhaps only for very simple diagrams
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A User of PlantUML Gizmo
June 21, 2016
I've been using this for an hour and so far it seems quite good. One observation: the panel can be too narrow for wider diagrams such as sequence diagrams with many lanes. It'd be nice to have the width of the side panel be adjustable.
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A User of PlantUML Gizmo
March 4, 2016
I haven't used this add-on extensively yet, but I've used PlantUML in other contexts for years to produce graphs. I'm thrilled that I can do it conveniently from within Docs now and expect this will save me a lot of time.
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A User of PlantUML Gizmo
August 19, 2014
Good work! Can of course be improved but it's already useful.
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