Check heading hierarchy, word count, alt text coverage, link count, and get an SEO score 0–100.
Paste Markdown to check its SEO quality.
Free Markdown SEO Checker analyzes your document for structural SEO problems: missing or duplicate H1 headings, heading level jumps, images without alt text, thin content, and missing links. It returns a score from 0 to 100 with issues grouped by severity.
Privacy: This tool runs entirely in your browser. Your text is never uploaded, logged, or cached. Close the tab and it's gone. Verify in DevTools → Network: zero requests fire.
Basic SEO checking should not require a subscription. The checker runs entirely in your browser.
| Input | Output | Typical size | Speed | Login needed |
|---|---|---|---|---|
| Markdown (.md) | SEO score + issue report | Any document size | < 10 ms | No |
Here's what this free tool does in detail — every feature is built to solve real problems, runs entirely in your browser, and is free forever.
The checker starts at 100 and deducts points for each issue found: 20 for errors (missing H1), 10 for warnings (heading jumps, missing alt text), and 5 for informational issues (thin content, no links). The score gives you a quick snapshot of content quality.
The checker flags missing H1 headings, multiple H1s, and heading level jumps (e.g., H2 followed by H4). Proper heading hierarchy helps search engines understand your content structure.
For a deeper heading analysis, use the Structure Validator.
Every image without alt text is flagged. Alt text improves accessibility and gives search engines context about your images. Missing alt text hurts both SEO and usability.
For a full accessibility audit, try the Accessibility Auditor.
The checker reports word count, link count, and image count so you can assess content depth at a glance. Thin content (under 100 words) and pages with no links are flagged as informational issues.
For detailed word and sentence analytics, see the Markdown Word Counter.
Paste any Markdown document into the input, or click Load example.
The score and issue list update instantly as you type.
Click Copy report for a plaintext summary grouped by severity.
Run the checker on every post to catch SEO issues before they go live.
Score pages systematically and prioritize fixes by severity.
Use the score as a gate -- content below 80 needs revision.
Ensure docs have proper heading hierarchy and alt text before deployment.
Include the SEO report alongside the draft to show quality.
Yes. Free forever, no account required.
Missing/multiple H1, heading jumps, images without alt, thin content, and missing links.
Starts at 100, deducts 20 per error, 10 per warning, 5 per info issue.
It checks structural elements in Markdown. HTML meta tags are outside Markdown scope.
No. Runs 100% in your browser.