AI Grammar & Duplicate Checker: Free Word Counter with Keyword Density

İsmail Günaydın••15 min read•Updated April 14, 2026

Quick Answer

TextWordCount combines word counting, AI grammar checking, duplicate content detection, and keyword density analysis in one free, no-account-required tool that processes everything locally in your browser. No text is sent to any server.

The Writing Quality Stack — In One Place

Most writers use 3-4 separate tools to check their content before publishing: a grammar checker, a plagiarism detector, a word counter, and a keyword density tool. Each requires a separate login. Some are paid. None share data with each other.

TextWordCount consolidates these into a single workflow. Paste once. Get word count, grammar issues, duplicate content risk, and keyword density — all from the same interface, all processed locally without sending your text anywhere.

Tool Comparison: TextWordCount vs Alternatives

Feature	TextWordCount	Grammarly	Copyscape	SEMrush
Word count	✓ Free, instant	✓ (in editor)	—	✓ (SEO Writing)
Grammar check	✓ AI-powered	✓ Industry-leading	—	Basic
Duplicate content	✓ Similarity check	Limited	✓ Web-scale	✓ (Site Audit)
Keyword density	✓ Free tool	—	—	✓ (paid)
Reading time	✓ Free	—	—	—
Character counter	✓ Free	✓	—	—
Price	Free	Free + $30/mo	$0.03/search	$130+/mo

Step-by-Step Use Case Walkthrough

Paste your draft — TextWordCount

Paste your content into the main word counter to get instant word count, character count, and reading time.

Check grammar — Grammar check feature

Run the AI grammar check to identify errors, passive voice issues, and sentence fragments before publication.

Check keyword density — Keyword density tool

Navigate to /tools/keyword-density, paste your content, and verify your target keyword appears at 1-2% density.

Check for duplicate content — Similarity check

Use the duplicate content checker to ensure your draft does not inadvertently mirror source material too closely.

Verify final length — Word counter

After all edits, run a final word count to confirm the piece meets your target length before submitting or publishing.

Frequently Asked Questions

What does a grammar and duplicate checker do?▼

A grammar checker identifies writing errors including typos, punctuation mistakes, subject-verb disagreement, and passive voice. A duplicate content checker identifies sections of text that closely match other published content. TextWordCount combines these with word counting and keyword density in one free tool.

Is duplicate content bad for SEO?▼

Duplicate content can hurt SEO if Google cannot determine which version to rank, or if thin duplicated content is perceived as low-quality. Internal duplication (same content on multiple pages of your own site) is more problematic than incidental similarity to other sources.

What is the right keyword density for SEO?▼

There is no single "correct" density, but most SEO practitioners target 1-2% for the primary keyword. Going above 3-4% risks keyword stuffing penalties. Use TextWordCount's keyword density tool to measure current density and compare against this benchmark.

How do I check word count and grammar at the same time?▼

Paste your content into TextWordCount. The tool simultaneously displays word count, character count, and reading time. Use the grammar check feature to flag writing errors without switching tools. Then navigate to /tools/keyword-density for keyword analysis.

Does TextWordCount store the text I paste into it?▼

No. TextWordCount processes all text locally in your browser. Nothing is transmitted to any server. Your content disappears when you close the tab. This makes it safe to use with client manuscripts, NDAs, and proprietary content.

How is a duplicate content checker different from a plagiarism checker?▼

A plagiarism checker compares your content against a database of web pages and academic papers, reporting percentage similarity. A duplicate content checker focuses specifically on whether substantial blocks of text match other sources. TextWordCount's tool helps you identify over-reliance on source material before publication.

Can I use TextWordCount for freelance client work?▼

Yes. Because TextWordCount processes content locally without storing it, it is appropriate for freelance work covered by NDAs. You can safely paste client manuscripts and sensitive briefs to check word count, grammar, and keyword density.

What is the difference between word count and character count?▼

Word count measures the number of distinct words. Character count measures every individual character including spaces and punctuation. Word count is used for content length targets (blog posts, essays, manuscripts). Character count is used for platform limits (Twitter/X: 280 characters, SMS: 160 characters, meta descriptions: 155 characters).

One Tool. Four Checks. Free.

Grammar, duplicate content, word count, keyword density — all in your browser, no account needed.

Open TextWordCount Check Keyword Density

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