Formatting Issues

How to Fix Excel Formatting Appearing Bold or Italic in Browser

Emma Brown Oct 21, 2026 868 views

Question details

The user needs to resolve an issue where Excel files display unexpected bold or italic text formatting when viewed in a web browser.

Fix Excel Formatting Appearing Bold or Italic in Browser

Product: Microsoft Excel
Device & OS: not provided
Scenario: Viewing an Excel workbook online or within a web browser, particularly Safari.
Observed behavior: Text formatting changes unexpectedly to bold or italic because the browser substitutes unsupported or missing fonts.

Before you start

Ensure you know which specific cells or sheets are displaying the incorrect formatting in the browser so you can target those exact fonts during the fix.

Solution 1Recommended

Replace with Web-Compatible Fonts

Change the fonts in your Excel workbook to standard web-safe fonts to prevent browser substitution issues.

When a browser like Safari cannot find the exact font used in your Excel file, it automatically substitutes it with a default system font. This substitution often incorrectly applies bold or italic styling. Using widely supported web-safe fonts like Arial, Calibri, or Verdana ensures consistent appearance across desktop applications and web browsers.

Select the affected text

Open your workbook and highlight the cells or columns that appear incorrectly formatted in the browser.

Open the font menu

Navigate to the Home tab on the top ribbon and locate the Font dropdown menu.

Choose a web-safe font

Select a universally compatible font such as Arial, Verdana, or Tahoma from the font list.

Save and verify

Save the document and reopen it in your browser to confirm the bold or italic formatting issue is resolved.

Formatting Maintained: Using standard system fonts guarantees that your spreadsheets look identical across almost all devices and platforms.

Solution 2

Install the Required Font on the Device

Install the missing custom font directly onto the device or browser environment experiencing the issue.

Format with WPS Spreadsheet

Effortlessly Manage Fonts and Formatting with WPS Office

Avoid cross-platform formatting issues by using WPS Spreadsheet. It offers full compatibility with Microsoft Excel formats and provides easy access to standard web-safe fonts, ensuring your files look exactly the same on desktop and in browsers.

1. Open the file in WPS Spreadsheet: Launch WPS Office and open your existing spreadsheet.
2. Select all cells: Press Ctrl+A to select your entire worksheet to apply a uniform font.
3. Apply a standard font: Go to the Home tab, click the Font dropdown, and select a web-safe font like Arial or Calibri.
4. Save the document: Click Save to update the file, ensuring it will render correctly in any web browser without unexpected bolding or italics.

Seamless compatibility with .xlsx and .xls Microsoft Office formats.Built-in support for universally recognized web-safe fonts.Lightweight and free alternative for everyday spreadsheet tasks.Consistent rendering across different devices and platforms.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Safari change my Excel fonts to bold or italic?

Safari uses font substitution when it cannot find the specific font embedded or used in your Excel file. The fallback font it chooses may have different default weights or styles, causing standard text to look bold or italic.

What are the best web-safe fonts to use in spreadsheets?

Arial, Calibri, Verdana, Tahoma, and Times New Roman are excellent choices because they are pre-installed on almost all operating systems and browsers, minimizing the risk of unwanted formatting changes.

Can I embed custom fonts in an Excel file to view in a browser?

While desktop spreadsheet applications allow font embedding in some specific scenarios, web browsers viewing Excel files online generally rely on local system fonts. It is best to stick to web-compatible fonts for files intended for online viewing.

Document & File Issues