A Word document looks perfectly formatted on screen. You export it to PDF and the margins are wrong. The left margin that was 1 inch in Word is now 1.25 inches in the PDF. The top margin shifted by half an inch. The document that looked balanced on screen now looks off-center on the page. This is not a rendering error. The PDF is faithfully reproducing the margins you set in Word. The problem is that you never explicitly set them, and Word's defaults do not match your intended layout.
Setting page margins correctly in Word before Word to PDF export ensures the PDF looks exactly as intended. The margin settings control the white space around the content, affecting both the visual balance of the page and the practical constraints of printing and binding.
Where to Find and Set Margins in Word
Go to the Layout tab on the ribbon. Click Margins. Word offers preset options: Normal at 1 inch on all sides, Narrow at 0.5 inches, Moderate at 1 inch top and bottom with 0.75 inches left and right, Wide at 1 inch top and bottom with 2 inches left and right. Select a preset or click Custom Margins at the bottom of the dropdown. The Page Setup dialog opens with the Margins tab selected. Enter your desired values for Top, Bottom, Left, and Right. Click OK. The document reflows to the new margins.
The custom margins dialog also includes the Gutter setting and Gutter position. A gutter is extra space added to the inside margin of pages that will be bound, such as a book or report. The gutter accommodates the binding so that text does not disappear into the spine. A typical gutter is 0.25 to 0.5 inches. If your document will be printed and bound, set a gutter on the left or top depending on the binding orientation.
Setting Different Margins for Different Sections
A document can have different margins in different sections. A title page might have 2-inch top and bottom margins to center the title vertically. The body pages might have standard 1-inch margins. To apply different margins to a section, insert a section break before and after the section. Place the cursor in the section. Go to Layout, Margins, Custom Margins. Set the margins. In the "Apply to" dropdown at the bottom of the dialog, select "This section." Click OK. Only the current section changes.
Section-based margin control is useful for documents with mixed content: a landscape table in the middle of a portrait document might need different margins to fit the wider content. The section break isolates the margin change so it does not affect the rest of the document.
Mirror Margins for Book Layout
For documents that will be printed double-sided and bound like a book, use mirror margins. In the Page Setup dialog, Margins tab, set "Multiple pages" to "Mirror margins." The Left and Right margin labels change to Inside and Outside. The inside margin is the edge that will be bound. The outside margin is the edge that will be free. Set the inside margin wider, typically 1.25 to 1.5 inches, to accommodate the binding. The outside margin can be narrower. Word automatically alternates the margins on odd and even pages.
Mirror margins produce a professional book layout where the text block is centered on each two-page spread. The white space is balanced between the facing pages. WukongPDF's PDF Printing respects mirror margins during export, producing a PDF that is ready for professional printing and binding.
Verifying Margins in the Exported PDF
After exporting to PDF, verify the margins by measuring the distance from the page edge to the text. In Adobe Acrobat, use the measuring tool under Tools, Measure. Measure from the left edge to the first character of text. The measurement should match your Word margin setting. If it differs, check the PDF export settings. In the Save As PDF dialog, click Options and ensure that "ISO 19005-1 compliant (PDF/A)" is not altering the layout. Also check that the paper size in the PDF matches the paper size in Word. A mismatch can shift margins.
Print a test page. Margins that look correct on screen may feel wrong on paper. A 1-inch margin looks generous on screen but may feel tight when you hold the printed page. The PDF Export with correct margins is a document that looks as good on paper as it did on screen. Adjust and re-export until the printed result matches your expectations. A practical tip for multi-section documents with different margin requirements: use the Page Setup dialog's Apply To dropdown strategically. When you need different margins for different sections, always choose This Section rather than Whole Document. Whole Document overwrites the margins for every section, including any you previously configured differently. If you accidentally apply a margin change to the whole document and need to restore the previous per-section settings, undo immediately with Ctrl+Z. Word does not have a per-section margin history, so the undo is your only recovery path. For documents that will be printed on both sides of the paper, set the gutter position to Left for left-bound documents and Top for top-bound documents. The gutter margin is added to the binding edge only, so odd-numbered pages get the gutter on the left and even-numbered pages get it on the right when mirror margins are enabled. This ensures that after binding, the text on both the front and back of each page is equally distant from the spine.