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.
By:fuhrmanator
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Overview
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.
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PlantUML Gizmo will need access to your Google account
This will allow PlantUML Gizmo to :
View and manage documents that this application has been installed in
View and manage the Google Slides presentations that this application is installed in
Display and run third-party web content in prompts and sidebars inside Google applications
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Darren Chinen
August 12, 2022
So glad this is here. It's painful to screenshot plantUML and paste into Google Docs.
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Quan Nguyen
November 4, 2022
Thanks for the work. It integrates well with PlantUML
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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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Péter Vojnisek
March 24, 2021
I gave five stars because I'm happy that PlantUML is available in docs. But there are some drawbacks as it was mentioned in other comments also: - PlantUML data is not stored on drive. What happens if the webserver won't be reachable anymore? Will we loose our data? - editor should be resizable
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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
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
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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A User of PlantUML Gizmo
July 30, 2014
Very useful add-on. Actually, I was waiting for it :) just as an improvement, it would be better to have plantuml code embedded in the document itself not in a side window and of course it would be hidden by default
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A User of PlantUML Gizmo
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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