Markdown Linter — Check & Fix Markdown Formatting
Automatically check your Markdown for common issues — skipped heading levels, trailing whitespace, broken links, inconsistent list markers, and more. Apply fixes with one click. 100% client-side — your text stays private.
How to Use the Markdown Linter
- Paste your Markdown content in the left editor.
- The linter automatically checks for issues as you type.
- Review issues in the right panel — each shows the line number, severity, and description.
- Click Apply Fix on individual issues, or Auto-Fix All to apply all automatic fixes at once.
Lint Rules
- Broken links (empty or invalid URLs)
- Table column mismatch
- Heading level skipping
- Trailing whitespace
- Images without alt text
- Multiple blank lines
- Heading spacing
- Code block language
- List marker consistency
- Line length > 120
Frequently Asked Questions
This linter covers the most common Markdown issues. It's designed to be helpful without being overwhelming. For comprehensive linting, tools like markdownlint (Node.js) offer 50+ configurable rules.
Auto-fix only changes the text in the editor. Your original file is never modified. Copy the fixed content from the editor to save your changes.
Use Cases
Quality Check
Validate Markdown files before publishing to catch formatting errors and inconsistencies.
Documentation Review
Lint project documentation for consistent heading structure and link validity before deployment.
Learning Best Practices
Use the linter to learn proper Markdown formatting conventions as you write.