This Add-on makes it possible to precisely control the size images in Google docs.
Works with:
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Overview
This Add-on makes it possible to precisely control the width & height of images in Google docs. It currently only works with ‘In line’ images. I’m waiting for feedback by the Google API team to make it also work with ‘Wrap text’ and ‘Break text’. (have been waiting forever so don't think this is going to happen.)

Use the menu Add-ons->SetImageSize->show sidebar to activate. Then select an image in your document and select "get size" in the sidebar. Now change the size to your liking, then select 'Apply' to make the change.

If you get the error "ScriptError: Authorization is required to perform that action." then maybe you are logged into your browser with multiple accounts and Google script doesn't like that.
Aug 17th 2019
- added link to privacy policy
July 18th 2018
- clarified that only in-line bitmap images are supported (eg. Google drawings are not).
June 28th 2018 
- added function to retrieve original image size [1:1]. Should work with bmp, gif, jpeg and png.
- stopped decimal places in presets.
June 19th 2018 
- added an additional authorization to allow the sidebar to open. This was a breaking change that Google made and which stopped the add-on to work from June 7th.
Additional information
PricingNot available
Developer
Trader status unspecified
SupportNot available
Privacy policy
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SetImageSize will ask for the permissions shown below. Learn more
SetImageSize will need access to your Google account
This will allow SetImageSize to :
View and manage documents that this application has been installed in
Display and run third-party web content in prompts and sidebars inside Google applications
Allow this application to run when you are not present
View and manage data associated with the application
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available
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