How to Check Grammar Offline in Chrome
Install LexiLint. Click the icon. Click "Check Spelling." Done — entirely offline, no internet required. LexiLint bundles English dictionaries inside the extension itself so spell checking never makes a network request. AI grammar checking uses your own API key (BYOK) and connects only to your chosen provider.
🤖 New: LexiLint for AI Assistants
Use LexiLint's spell and grammar checking directly in Claude Desktop, ChatGPT, Cursor, and other AI assistants via the Model Context Protocol (MCP).
How Offline Grammar Checking Works in LexiLint
Dictionaries Bundled in the Extension
LexiLint ships with US English and UK English dictionaries packaged inside the Chrome extension. No download required after installation. The dictionaries are always available, even without Wi-Fi.
Instant In-Browser Processing
When you click "Check Spelling", LexiLint scans every word on the page against the local dictionary entirely inside your browser. Results appear in seconds with visual highlights on misspelled words.
AI Grammar: BYOK, Your Choice of Provider
For AI grammar checking, you provide your own API key for Google Gemini (free), OpenAI, or Anthropic Claude. LexiLint sends the text directly from your browser to the provider — no server in the middle.
Local LLM Coming Soon
Full offline AI grammar checking via local LLM support is on the LexiLint roadmap. When released, grammar checking will work with zero internet connection and zero data leaving your device.
Step-by-Step: Offline Spell Check in Chrome
- Install LexiLint from the Chrome Web Store (free)
- Navigate to any webpage you want to check — including localhost or staging
- Click the LexiLint icon in the Chrome toolbar
- Click "Check Spelling" — results appear instantly, no internet needed
- Click highlighted words to see suggestions, accept or dismiss each one
- Optionally: add your Gemini API key for free AI grammar checking
Offline Capability Comparison
| Capability | LexiLint | Grammarly | Chrome Built-in |
|---|---|---|---|
| Spell check webpages offline | ✓ | ✗ | ✗ (input fields only) |
| Works on localhost/staging | ✓ | ✗ | ✗ |
| AI grammar checking | ✓ Free (BYOK) | ✓ Paid | ✗ |
| Zero data collection | ✓ | ✗ | ✓ |
| Custom dictionary | ✓ | ✓ | ✗ |
Frequently Asked Questions
How do I check grammar offline in Chrome?
Install LexiLint from the Chrome Web Store. Open any webpage, click the LexiLint toolbar icon, and click "Check Spelling." This runs a fully offline spell check using dictionaries bundled inside the extension. No internet connection required.
Is there a Chrome extension that checks spelling without internet?
Yes — LexiLint. US and UK English dictionaries are bundled directly inside the extension. Spell checking runs entirely on your device, even in airplane mode.
Can LexiLint check grammar on localhost or staging sites?
Yes. LexiLint works on any page Chrome can open — localhost, staging, internal tools, and live websites. Grammarly does not work on localhost or custom URLs.
What is BYOK for grammar checking?
BYOK (Bring Your Own API Key) means you connect LexiLint directly to Google Gemini, OpenAI, or Anthropic Claude using an API key you create. Your text goes from your browser to the AI provider — LexiLint's servers are not involved. Google Gemini is free.
Will LexiLint support fully offline AI grammar in the future?
Yes. Local LLM support — enabling 100% offline AI grammar checking — is on the LexiLint roadmap. It will work with no internet connection and zero data leaving your device.
Offline Spell Check for Any Webpage — Free
Install LexiLint and check spelling on any page instantly, no internet required. Add a Gemini API key for free AI grammar checking.
Add to Chrome — Free