LanguageTool Not Working in Overleaf

How to fix it

// try these in order, the most common fix is first

1. FIX 1Switch to the Visual Editor

   Copy steps
   1. 01In your Overleaf project, use the editor toggle above the text
   2. 02Choose 'Visual Editor'
   3. 03Click the LanguageTool icon and turn checking on
   Did this fix it? Yes No

2. FIX 2Check the extension's site settings

   Copy steps
   1. 01Click the LanguageTool icon while on overleaf.com
   2. 02Make sure checking is enabled for this site
   3. 03Check your browser's extension permissions allow the site
   Did this fix it? Yes No

3. FIX 3Try Chrome or Edge

   1. 01Open the project in Chrome or Edge, where LanguageTool updates usually arrive first
   Did this fix it? Yes No

Symptoms

The extension stays inactive on overleaf.com or switches itself off after a refresh; no underlines in the LaTeX source.

Why it happens

• C-01Overleaf replaced Source/Rich Text with Code Editor and Visual Editor in 2025
• C-02LanguageTool works poorly in the Code Editor
• C-03Firefox and Safari fixes are delayed
• C-04Overleaf is disabled in the extension settings

// this guide also covers

• languagetool overleaf not working
• languagetool overleaf firefox
• languagetool latex

Other LanguageTool errors

• LanguageTool Extension Stopped Working (Upgrade Required)
• LanguageTool Not Working in Google Docs
• LanguageTool Not Working in Word
• LanguageTool Detects the Wrong Language
• LanguageTool Slow and Using High Memory in Firefox
• LanguageTool Not Working in Chrome
• LanguageTool Text Too Long (Character Limit)
• LanguageTool Self-Hosted Server Setup (Use the Extension Free)