Markdown Linter
Check common Markdown style issues and show their line numbers.
Processing stays in your browser. Checks heading spacing, heading jumps, trailing spaces, unclosed code fences, and long lines. It is a small style checker rather than a full Markdown specification validator.
How to use the markdown linter
Check common Markdown style issues and show their line numbers. Complete the markdown document fields above, or upload a UTF-8 text file for the first field. Choose Run tool, review the output, then copy or download the result.
Example
A heading jump from # to ### is reported with its line number.
Good to know
Checks heading spacing, heading jumps, trailing spaces, unclosed code fences, and long lines. It is a small style checker rather than a full Markdown specification validator.