Markdown Linter
Lint Markdown for heading structure, code fences, bare URLs, missing alt text and spacing. Free and private: runs in your browser.
Paste a README or docs page to get markdownlint-style rule IDs (MD001, MD040…) with line numbers.
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Find a syntax error before the build or deploy fails.
- Check config files in code review.
- Learn the rules your linter enforces.
Frequently asked questions
Why add a language to code fences?
GitHub and docs sites use it for syntax highlighting, which makes examples much easier to read.
Is the Markdown Linter free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
What should I do with the issues it reports?
Fix high-severity items first; they usually break builds or deployments. Lower-severity items are style and best-practice suggestions.
Related tools
Checking one snippet is a start. Scan your whole repository for free with CodeInspector.