Free Content SEO Tools
Keyword, Readability & Optimization
These 6 free content SEO tools cover everything your workflow needs — keyword density checker, keyword research, readability analyzer, content optimizer, duplicate checker, and internal linking suggestions.
Content SEO Tools — Keyword Density Checker
Check how often your target keyword appears in your content and whether it’s in the ideal 1–2% range.
Keyword density is one of the most fundamental content SEO tools checks. According to Google’s guidance on helpful content, focus on writing naturally for users — keyword density analysis helps you verify you’re neither over-optimizing nor under-using your target term.
Paste any URL or text and instantly see keyword frequency, density percentage, and a breakdown of all keywords used. Identifies over-optimization (keyword stuffing) and under-use of your focus keyword before publishing.
Keyword Density (Homepage)
Extracts visible homepage text and shows top keywords. Export to CSV or PDF.
Keyword Research Tool
Discover keyword ideas, related terms, and search suggestions to target in your content strategy.
Enter any seed keyword and get related keyword suggestions, long-tail variations, and topic ideas. Find low-competition keywords your competitors are missing and build a content strategy around real search demand.
🔍 Advanced Keyword Research
Readability Analysis Tool
Check your content’s Flesch-Kincaid readability score and make it easier to read — for users and Google.
Measures reading ease using the Flesch-Kincaid formula. Analyzes average sentence length, word complexity, paragraph structure, and passive voice usage. A score of 60–70 is ideal — easy enough for most readers, professional enough for authority sites.
📖 Content Readability Analysis
Content Optimization Tool
Get actionable suggestions to improve your content’s SEO score — headings, keywords, structure, and more.
Analyzes your content against SEO best practices and provides specific improvement suggestions — missing H2 subheadings, keyword placement in title/first paragraph, LSI keyword gaps, content length recommendations, and image alt text issues.
💡 Content Optimization Suggestions
Content Duplication Checker
Detect duplicate content on your website before it hurts your Google rankings.
Checks for duplicate or near-duplicate content across your pages. Duplicate content splits your ranking signals between multiple URLs, confusing Google about which page to rank. Identify and fix duplication issues before they damage your SEO.
👯 Content Duplication Checker
Internal Linking Suggestions
Find internal linking opportunities to distribute page authority and improve crawlability across your site.
Analyzes your page content and suggests relevant internal links to other pages on your site. Strong internal linking helps Google understand your site structure, distributes link equity to important pages, and keeps users engaged longer.
🕸️ Internal Linking Suggestions
Use Content SEO Tools in 3 Steps
No account. No API key. Instant results.
Enter URL or Text
Paste your page URL or content text into any content SEO tool above.
Get Analysis
Keyword density, readability score, and optimization tips appear instantly.
Apply & Re-Test
Fix the issues, update your content, and re-run the content SEO tools to confirm.
Content SEO Best Practices
Follow these rules to write content that ranks higher and converts better.
These best practices work alongside our content SEO tools to maximize the impact of every page you publish. See Moz’s guide to on-page SEO for additional frameworks that complement the checks our tools perform.
Keyword in First 100 Words
Place your primary keyword in the first paragraph to signal relevance to Google immediately.
Aim for 1,500+ Words
Longer content tends to rank higher. Cover a topic comprehensively to outrank thin competitor pages.
Use H2 & H3 Subheadings
Break content into sections with keyword-rich subheadings. This helps both readers and Google understand structure.
Add 3–5 Internal Links
Link to related pages on your site in every article. Spread link equity and guide users deeper into your content.
Keep Sentences Short
Aim for sentences under 20 words. Short sentences improve readability score and reduce bounce rate.
Add Alt Text to Images
Every image needs a descriptive alt tag with your keyword. This helps with image SEO and accessibility.
Complete Your SEO Analysis
Content is one piece — use these tools for a full SEO picture.