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Markdown Checker

Catch structural and accessibility problems without uploading your document or enforcing a fussy house style.

How to Use2 Quick Steps & Important Notes

How to Use

  1. Paste or write Markdown in the editor.
  2. Review suggestions by line number and apply the useful fixes in your document.

What to Expect

  • The checker focuses on readable structure and accessibility, not one strict writing style.
  • Your text is checked locally and is never uploaded.
5 suggestions · 3 important

Line 1: This document has no level-one heading.

Add one # heading as the document title.

first-heading-h1

Line 3: Heading level jumps from H2 to H4.

Use H3 here, or add the missing level above it.

heading-increment

Line 5: This web address is not a descriptive Markdown link.

Use [helpful link text](https://example.com).

bare-url

Line 7: This image has no alternative text.

Describe the image between the square brackets.

image-alt

Line 9: This code block has no language.

Add a language after the opening fence, such as ```js.

fenced-code-language