The "MsoNormal" Plague
Microsoft Word is a print-layout tool. It cares about inches, page breaks, and paper size.
WordPress is a web-layout tool. It cares about pixels, responsiveness, and semantic HTML.
When you Copy from Word and Paste into WordPress (Visual Editor), Word tries to force its print layout onto the web. It injects massive amounts of invisible HTML garbage known as `mso-` tags.
Example:
`<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:115%">`
This bloat has severe consequences:
1. Inconsistent Fonts: Your theme sets the font to "Roboto", but the Word paste forces "Calibri".
2. Mobile Issues: Fixed line heights or margins meant for A4 paper break on iPhone screens.
3. SEO Penalty: Search engines have to crawl through 10KB of garbage code to find 1KB of text. This slows down the page load speed (Core Web Vitals), which hurts your ranking.
The "Paste as Text" Solution
WordPress has a "Paste as Text" button (often hidden), but the most reliable method is an external Plain Text Converter.
Step 1: The Detox
Copy your entire article from Word.
Paste it into the Converter.
This strips everything: tables, images, bold, italics, links, and the dreaded `mso-` tags.
Step 2: The Rebuild
Paste the clean text into WordPress.
Now, use WordPress's native tools to add back the Bold headers, the bullet points, and the links.
"But that takes time!"
Yes, but it ensures the code is semantic. `<h2>` means Header 2. It doesn't mean `<p style="font-size:18pt; bold:true">`. Semantic HTML is critical for SEO and Accessibility.
Handling "Smart Lists"
Word handles bullet points in a proprietary way. When pasted, they often turn into symbols (`·`) instead of HTML list tags (`<ul><li>`).
A text cleaner turns these lists into plain text lines starting with asterisks or dashes. WordPress's Gutenberg editor is smart enough to recognize a line starting with `- ` as a list item and auto-format it correctly. This "Markdown-style" writing is the bridge between Word and Web.
Conclusion
Don't let Microsoft Word dictate your website's design. Treat Word as a drafting tool, not a publishing tool. Scrub the text clean before it crosses the border into your CMS.