Lint Markdown

Find common Markdown style issues such as trailing spaces, heading mistakes, and list spacing.

freeworks offlinenothing uploaded
ToolMarkdown Linter
Input
Output
—
Put this on your own site

The frame below runs the same code as this page, in the reader's own browser. Nothing is sent to us, and nothing is sent to you.

Pick a dark background and the text and panels follow it, so the frame stays readable on a dark page.

Preview

How it works

Source lines are scanned for trailing whitespace, heading style, blank-line boundaries, list spacing, and fence consistency; each finding includes a line and rule code. The pass checks source patterns rather than rendering a complete Markdown AST.

  • The rules target common source-control noise.
  • Findings are reported so intentional exceptions can be reviewed.

Worked example

Lint Markdown for issues
Check Markdown for common style problems
Input
											#Missing space

Some text



Too many blank lines
Output
												Line  Severity  Rule                     Message
----  --------  -----------------------  --------------------------------
1     error     no-missing-space-header  Header missing space after #
6     warning   no-multiple-blanks       Multiple consecutive blank lines
7     warning   final-newline            File should end with a newline

When to use this

Documentation CI, README reviews, and static-site content checks lint Markdown.

Edge cases

  • Two trailing spaces can be an intentional hard line break.
  • A heading-like line inside a fenced code block should not be treated as document structure.
  • Mixed list indentation can render differently across parsers.

References