Why fonts change when you convert Word to PDF
Published October 12, 2026
You convert a Word document to PDF and something shifts: a heading wraps onto two lines, a table spills onto the next page, the text looks subtly different. Almost always, the cause is fonts.
Why fonts change
A Word document doesn't usually contain its fonts. It only stores their names, such as "Calibri" or "Times New Roman", and relies on the computer opening it to have them installed. Word on Windows and Mac comes with Microsoft's fonts, so the document looks right there.
A converter running somewhere else, whether a web service, a different operating system or a browser, may not have those fonts. Many common Microsoft fonts can't be freely redistributed, so tools that don't have a license for them have to pick a replacement. If the replacement has different letter widths, every line breaks in a different place, and the layout drifts from there.
Metric-compatible fonts help preserve the layout
Some open-source fonts were designed to have the same letter widths as popular Microsoft fonts. They are called metric-compatible fonts. They reduce changes to line breaks, even though the letter shapes look a little different. Other layout differences can still change pagination.
| Font in your document | Metric-compatible replacement |
|---|---|
| Calibri | Carlito |
| Cambria | Caladea |
| Arial | Arimo |
| Times New Roman | Tinos |
Our Word to PDF converter uses these replacements automatically to help preserve the layout, but page count and page breaks can still differ from Word. Fonts that aren't on this list are replaced with an available fallback, which can also change line breaks.
How to reduce layout changes
- Embed fonts when sharing editable documents. In Word for Windows, go to File → Options → Save and turn on Embed fonts in the file. This can help in apps that support embedded fonts; it doesn't guarantee the same layout in every converter. Some fonts don't allow embedding, and embedding makes the file larger.
- Use common fonts. Calibri, Cambria, Arial and Times New Roman all have metric-compatible replacements, which reduce font-related layout changes.
- Leave some slack. A table that exactly fills a page, or a heading that just fits on one line, is the first thing to move when a font changes. A little extra space absorbs small differences.
- Check the PDF. Open the result and scroll through it before you send it, especially around tables and page breaks.
Other things that can change
Fonts are the most common cause, but not the only one. Charts, SmartArt graphics and equations are harder to reproduce outside Word. Our converter warns about some of these features when it detects them, but it may not detect every occurrence. Check the PDF even if no warning appears.
The conversion runs in your browser, so the document is never uploaded. If you have Word, exporting from Word itself (File → Save as → PDF) will always match what you see on screen. When you don't, a converter with metric-compatible fonts is the next best thing. Unsure which format to send? See DOCX vs PDF.