Quality Checker
Lint your Markdown documents online. Quality Checker finds errors: missing heading spaces, heading level skips, trailing spaces, excessive blank lines, empty links and non-breaking spaces. A free online Markdown linter for clean, error-free documents.
All tools in one screen
Demo
What Quality Checker finds
Heading spaces
Finds headings without space after #. Error: ##Text instead of ## Text.
Heading levels
Warns about level skips: h1 → h3 without an intermediate h2.
Trailing spaces
Finds trailing spaces at the end of lines (except double space for hard break).
Excessive blank lines
Warns about three or more consecutive blank lines.
Empty links
Finds links with an empty URL: [text]().
NBSP
Detects non-breaking spaces ( ) in text.
Frequently Asked Questions
All tools in one Workspace
Quality Checker + Quick Fix — find issues and fix them in one click.