Formatting Issues

How to Create an A3 Page in Word for the Web

Huma Ashraf ChHuma Ashraf Ch Oct 28, 2026 869 views

Question details

The user wants to create an A3-sized document using Word for the web, but the A3 format is unavailable in the standard paper size list.

How to Create an A3 Page in Word for the Web
Product
Word for the web
Device & OS
not provided
Scenario
Setting up the document layout and page size for a large format document in the web-based word processor.
Observed behavior
The default paper size dropdown in Word for the web only shows basic options and does not include the standard A3 paper size.
Before you start

Ensure you know the exact dimensions of an A3 page (11.7 × 16.5 inches or 297 × 420 millimeters) before modifying your page layout settings.

Solution 1Recommended

Use Custom Page Size with A3 Dimensions

Manually enter the standard A3 dimensions using the Custom Page Size feature since Word for the web offers limited default printer-based paper sizes.

Word for the web provides fewer default paper size options compared to the desktop application because it does not read paper sizes directly from your local printer driver. However, you can easily bypass this limitation by entering custom measurements.

1
Open Page Setup

In your Word for the web document, navigate to the Layout tab on the top ribbon menu and click on Size.

2
Select Custom Page Size

Scroll to the bottom of the dropdown menu and select Custom Page Size.

3
Enter A3 Dimensions

Enter the exact dimensions for A3 paper. Type 11.7 for the width and 16.5 for the height if using inches, or 297 for width and 420 for height if using millimeters.

4
Apply Changes

Click OK to apply the new page size to your document. Your document canvas will update to reflect the A3 dimensions.

Use Custom Page Size with A3 Dimensions
Unit Measurement: Make sure to check whether your Word for the web settings are using inches or millimeters to ensure you enter the correct numerical values.
Easily Format A3 Documents

Create A3 Pages Instantly with WPS Writer

WPS Writer provides a comprehensive set of default page sizes, including A3, right out of the box. No need to memorize custom dimensions—just select your preferred paper size and start working.

  1. 1. Open WPS Writer: Launch WPS Office and open a new or existing document in WPS Writer.
  2. 2. Go to Page Layout: Click on the Page Layout tab located in the top ribbon menu.
  3. 3. Select Size: Click on the Size icon to open the dropdown menu containing all standard paper formats.
  4. 4. Choose A3: Scroll through the list and select A3 (297 × 420 mm) to instantly apply the format to your document.
Built-in A3 page size option without needing custom dimension inputs.Fully compatible with Microsoft Word formats (.docx, .doc) for seamless sharing.Advanced page layout and printing options unavailable in basic web editors.Lightweight, free, and accessible on both desktop and mobile devices.
microsoft office alternative - wps office

Frequently Asked Questions

Why isn't A3 showing up in Word for the web?

Word for the web provides only basic, standard page sizes (like Letter and A4) to ensure fast performance across browsers. It does not automatically pull all available paper sizes from your local printer driver like the desktop version does.

What are the exact dimensions of an A3 page?

An A3 page measures 11.69 by 16.54 inches, which is exactly equivalent to 297 by 420 millimeters.

Will my custom A3 page print correctly from the web browser?

Yes, if you download the document as a PDF or print directly from the browser, it will print correctly as long as your physical printer supports A3 paper and A3 is selected in your system's print dialog.

Can I save the A3 custom size as a default in Word for the web?

Word for the web does not currently support saving custom page sizes as a default template. You will need to enter the dimensions for each new document that requires an A3 format.