Page Sizer by Adam Natad

CDN

🧑‍💻 Developer: Adam Natad

🌐 Google Workspace Marketplace - Easy Install

https://gsuite.google.com/marketplace/app/foo/207001493947

📦 GitHub Repository - Full Source Code

https://github.com/AdamNatad/PageSizer/

🗃️ GitHub Release

https://github.com/AdamNatad/PageSizer/releases

Custom Page Sizer for Google Docs™

Freely set custom page sizes and margins in Google Docs™. Perfect for Amazon KDP Paperback and Hardcover trim sizes. Built for authors who love writing in Google Docs™. Made with ♥️

Page Sizer by Adam Natad is a lightweight Google Docs™ add-on (Apps Script) that adds a custom menu inside Google Docs, allowing you to set page width, height, and margins beyond the default limitations.

🌐 Google Workspace Marketplace

Install the add-on from the Google Workspace Marketplace:

👉 Install Page Sizer (Marketplace):
https://workspace.google.com/marketplace/app/page_sizer_by_adam_natad/207001493947

Alternative listing link:
https://gsuite.google.com/marketplace/app/foo/207001493947

⚙️ Features

Set exact page width and height (in inches or centimeters)
Adjust top, bottom, left, and right margins
Choose from preset trim sizes or define your own
Adds a custom menu: Page Sizer by Adam Natad
Shows an animated success popup after applying changes
Includes a guide dialog for first-time users
Designed for authors and self-publishers (especially Amazon KDP)

📁 Files Location

All scripts are inside the AppScript folder:

🚀 How to Install and Use (Manual Setup)

Open your Google Doc
Go to Extensions → Apps Script
Delete any existing code in the script editor
Add the following files:
- Create a Script file named Code.gs, then paste from:
  AppScript/Code.gs
- Create an HTML file named PageSizeDialog.html, then paste from:
  AppScript/PageSizeDialog.html
- Create an HTML file named SuccessDialog.html, then paste from:
  AppScript/SuccessDialog.html
- Create an HTML file named GuideDialog.html, then paste from:
  AppScript/GuideDialog.html
Enable the manifest file (appsscript.json):
- Click ⚙️ Project Settings
- Enable Show "appsscript.json" manifest file in editor
- Open appsscript.json and replace its contents with:
  AppScript/appsscript.json
Save the project
Authorize the app when prompted:
- The first time you run it (via the custom menu), Google will ask for authorization
Reload your Google Doc
You will see a new menu called Page Sizer by Adam Natad
Click Start, enter your custom size and margins, then click Apply

🔐 Permissions (OAuth Scopes)

When first used, Google will ask for authorization. The add-on uses:

https://www.googleapis.com/auth/documents.currentonly
Allows the add-on to modify only the currently open Google Doc (needed to apply custom page sizes and margins).
https://www.googleapis.com/auth/script.container.ui
Allows the add-on to create UI inside Google Docs (custom menu + dialogs).