Page Sizer by Adam Natad

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

A lightweight Apps Script tool that adds a custom menu inside Google Docs, allowing you to set your own page width, height, and margins beyond the default limitations.

Page Sizer by Adam Natad is a simple yet powerful Google Docs™ add-on that allows you to freely set custom page sizes and margins for your documents with ease. Whether you're preparing manuscripts for Amazon KDP Paperback or Hardcover formats, or simply want precise control over your document layout, this tool is built to support your writing needs.

⚙️ 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
– Designed with authors and self-publishers in mind

I created this for myself to streamline my publishing process, and I’m sharing it to help other writers and indie authors who love working in Google Docs™ as much as I do. No complicated setup, just install, customize, and write your story your way.

– Google Docs™ is a trademark of Google LLC
– NatadTech™ is a trademark of NatadTech Solutions OPC

✨ Features

Set custom page size and margins
Adds a custom menu: Page Sizer by Adam Natad
Animated success popup after applying changes
Guide dialog for first-time users

📁 Files Location

All scripts are located inside the AppScript folder:

Code.gs
PageSizeDialog.html
SuccessDialog.html
GuideDialog.html
appsscript.json

🚀 How to Install and Use

Open your Google Doc.
Navigate to Extensions → Apps Script
Delete any existing code in the script editor.
Add the following files:
- Create a Script file named Code.gs and paste the contents from AppScript/Code.gs
- Create an HTML file named PageSizeDialog.html and paste the contents from AppScript/PageSizeDialog.html
- Create an HTML file named SuccessDialog.html and paste the contents from AppScript/SuccessDialog.html
- Create an HTML file named GuideDialog.html and paste the contents from AppScript/GuideDialog.html
- Enable viewing of the manifest file:
  - Click the ⚙️ gear icon (Project Settings) in the left sidebar
  - Check "Show 'appsscript.json' manifest file in editor"
- Open the newly visible appsscript.json file and replace its contents with the JSON from AppScript/appsscript.json
Save the project.
Authorize the App:
- When you run the script for the first time, you will be prompted to grant authorization.
- The app requires the following OAuth scopes:
  - https://www.googleapis.com/auth/documents.currentonly – Modify the currently open Google Doc
  - https://www.googleapis.com/auth/script.container.ui – Manage UI elements like menus and dialogs
- Follow the on-screen prompts and click Allow.
Reload your Google Doc.
A new menu called Page Sizer by Adam Natad will appear in your document.
Select Start from the new menu to launch the page sizing tool.
Enter your custom dimensions and margins, then click Apply.