The free Google Docs™ add-on for custom page dimensions, margins, and colors. 50+ presets for KDP, A4, Letter, and more.
Listing updated:February 7, 2026
Works with:
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Overview
DocSize - Custom Page Dimensions, Margins & Background Colors for Google Docs™

Tired of Google Docs™ limited page size options? DocSize lets you set ANY custom page dimensions, margins, and background colors directly in Google Docs™.

PERFECT FOR:
• Self-publishers formatting books for Amazon KDP, IngramSpark, or Lulu
• Authors creating manuscripts in standard book sizes (6x9, 5x8, 5.5x8.5)
• Students and professionals needing A4, A5, or Letter formatting
• Designers creating custom-sized documents and booklets
• Anyone who needs precise control over document dimensions

KEY FEATURES:

📐 Custom Page Sizes
Set exact width and height in inches. Create documents in any dimension—no more being limited to Letter or A4.

📚 Book Size Presets
One-click presets for popular formats:
• Amazon KDP sizes (6"×9", 5"×8", 5.5"×8.5", and more)
• Standard paper sizes (A4, A5, Letter, Legal, Tabloid)
• Common book dimensions for self-publishing

📏 Precise Margin Control
Set individual top, bottom, left, and right margins in inches. Perfect for print-ready manuscripts and professional documents.

🎨 Background Colors
Change your document's background color using any hex color code or the built-in color picker.

⚡ One-Click Application
Apply all settings instantly with a single click. No complicated menus or multiple steps.

WHY DOCSIZE?
✓ 100% Free - No premium tiers, no subscriptions, no hidden costs
✓ Privacy-First - We don't collect, store, or transmit any of your data
✓ Easy to Use - Simple sidebar interface that works inside Google Docs™
✓ Instant Results - Changes apply immediately to your document

HOW TO USE:
1. Open any Google Document
2. Go to Extensions → DocSize → Open DocSize
3. Select a preset or enter custom dimensions
4. Click "Apply all settings"

POPULAR USE CASES:
• Format manuscripts for Amazon KDP publishing
• Create print-ready book interiors
• Design custom-sized booklets and pamphlets
• Set up A5 planners and journals
• Prepare documents for professional printing

Google Docs™ and Google Workspace™ are trademarks of Google LLC.
Additional information
PricingFree of charge
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Terms of service
DocSize - Page Size & Margins for Google Docs™ will ask for the permissions shown below. Learn more
DocSize - Page Size & Margins for Google Docs™ will need access to your Google account
This will allow DocSize - Page Size & Margins for Google Docs™ to :
See, edit, create, and delete all your Google Docs documents
Display and run third-party web content in prompts and sidebars inside Google applications
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available
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ryan trobaugh
February 19, 2026
Simple and works well.
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