SEO Content Analyzer — Free On-Page Audit, Browser
Audit content for SEO: word count, readability, heading structure, keyword density. Browser-only.
About SEO Content Analyzer
On-page SEO content analysis evaluates whether a piece of content is structured to rank well — title length, meta description length, heading hierarchy (H1 > H2 > H3), word count, readability (Flesch / Flesch-Kincaid), keyword density, internal-link count, image alt-text presence. The ZTools SEO Content Analyzer parses HTML or pasted text, scores against established SEO best practices, and flags improvements. Useful as a pre-publish checklist. Doesn't replace tools like Yoast or Surfer for deep optimization — focuses on the universal basics.
Use cases
- Pre-publish content audit. Before clicking publish, run the article. Title too long? H1 missing? Word count too low for the topic? Fix before going live.
- Audit existing content for re-optimization. Old blog posts. Run analyzer; identify which need refreshing (low word count, missing structure, etc.).
- Quick check during writing. Mid-draft, paste current text. See readability score, suggested length, missing structural elements.
- Compare your content vs top-ranking competitors. Audit both; compare word counts, structure, depth.
How it works
- Paste content (HTML or plain text). Tool parses to extract structure (headings, paragraphs, lists, links, images).
- Run audit. Title length, meta description length, H1 count (should be 1), word count, readability score, keyword density (configurable target keyword).
- Display report. Each criterion with pass / warning / fail. Suggestions per failed item.
Examples
Input: 500-word article, no H1
Output: Word count: warning (typical articles target 1000-1500). H1: fail (missing). Readability: pass (Flesch 65, easy enough).
Input: 2000-word article with proper structure
Output: Word count: pass. Heading hierarchy: pass. Readability: pass. Keyword density: 1.2% — pass.
Frequently asked questions
What word count is "right"?
Topic-dependent. Quick how-tos: 500-800 words. Definitive guides: 1500-3000+. Top-ranking content for competitive keywords averages 1500+ words.
Keyword density?
Princeton GEO study shows keyword stuffing actively hurts AI visibility (-10%). Aim for 0.5-1.5% — natural use, not stuffed.
Readability score?
Flesch 60-70 (easily understood by 8th-9th graders) is the sweet spot for general audiences. Technical content can score lower.
Privacy?
All in browser.
Pro tips
- Aim for one H1 per page (the main title), then H2s for sections.
- For target keywords, include in title, first paragraph, at least one H2 — but don't stuff.
- Check readability — if Flesch < 30, rewrite for clarity.
- Always include an image alt text — accessibility + SEO double win.
Reviewed by Ahsan Mahmood · Last updated 2026-05-06 · Part of ZTools.
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