Free Markdown Formatter — Clean and Normalize Markdown Online
Clean and normalize messy markdown automatically
What the formatter fixes
- Heading levels and surrounding blank lines
- List indentation (normalises to 2 spaces)
- Blank lines between blocks
- Trailing whitespace on each line
- Inconsistent bullet styles
How it works
Paste your markdown and click Format. The tool applies normalisation rules and shows a before/after diff so you can see exactly what changed.
The formatter is non-destructive — it only changes whitespace and structure, never your content.
Common use cases
- Cleaning up AI-generated markdown output
- Normalising docs before committing to git
- Fixing inconsistent list styles across a team
- Preparing markdown for PDF export
Frequently asked questions
Quick answers about formatting rules, before/after review, and how this compares with CLI formatters.
What markdown formatting issues does this tool fix?
The formatter normalizes heading spacing, list indentation (2 spaces), blank lines between blocks, trailing whitespace on each line, and inconsistent bullet styles.
Will the formatter change my text content?
No. Only whitespace, blank lines, and structural formatting are changed. Your actual text, links, code, and images are never modified.
Can I see exactly what changed after formatting?
Yes. The formatter shows a before/after diff highlighting every change so you can review the result before copying it.
Is this the same as running prettier on a markdown file?
It's similar in intent. The formatter applies a consistent set of markdown normalisation rules, though it is a browser-based tool rather than a CLI formatter like Prettier.
Once formatted, you can export to PDF or verify the result in the live editor.