Markdown Linter

Check empty/duplicate headings, level jumps and bare URLs.

Markdown Linter

Check common Markdown issues: empty headings, duplicates, bare URLs.

Input
Output

What can you do with it?

Pre-commit style checks

Catch heading/list spacing issues before PR

Normalize docs

Align README/Wiki style with common lint rules

Clean pasted text

Remove trailing spaces and noisy blank lines

Locate issues faster

Fix from prompts instead of scanning blindly

Refresh legacy docs

Batch-tidy older Markdown files

Local linting

Keep private docs in the browser

Why choose this tool?

Common lint rules

Headings, lists, blank lines and more

Fast feedback

Paste and review issues quickly

Guided fixes

Reduce manual hunting for style nits

Local-first

No upload required for checking

How to use?

1

Paste Markdown

Drop the draft into the input area

2

Run checks

Review reported style issues

3

Fix and re-check

Correct issues, then copy the clean result

Related tools

Markdown Editor

Open .md files in the browser. Side-by-side live preview with code highlight, image insert and dark mode. Drafts auto-save locally and never leave your device.

HTML to Markdown

Paste any HTML — web source, WeChat articles, rich text — and get clean GFM Markdown. Fully local, no uploads.

Markdown Heading Slugs

Generate heading slugs for TOC and anchors.

Markdown TOC Generator

Generate a clickable Markdown table of contents from headings.

Markdown Link Extractor

Extract links and image URLs from Markdown.

Markdown Table Generator

Convert CSV/TSV into Markdown tables quickly.

Mermaid Diagrams

Live Mermaid editor for flowcharts, sequence, class, ER, gantt and more. Export SVG/PNG fully in-browser.

Markdown Word Counter

Count words, characters, paragraphs and reading time.

FAQ

Full spec linter?
No, focuses on common issues.
Changes source?
No, report only.
Local?
Yes.