Fix mixed tabs/spaces, CRLF line endings, trailing whitespace, BOM characters, and collapsed blank lines.
Free Markdown Whitespace Normalizer fixes seven common whitespace problems in one pass: tabs to spaces, trailing whitespace, CRLF line endings, BOM characters, excessive blank lines, and missing final newlines. Every option can be toggled independently.
Privacy: This tool runs entirely in your browser. Your text is never uploaded, logged, or cached. Close the tab and it's gone. Verify in DevTools → Network: zero requests fire.
Whitespace problems are invisible until a linter screams. Fixing them shouldn't cost anything. The tool runs entirely in your browser.
| Input | Output | Typical size | Speed | Login needed |
|---|---|---|---|---|
| Markdown (.md) | Normalized Markdown | Any document size | < 10 ms | No |
Here's what this free tool does in detail — every feature is built to solve real problems, runs entirely in your browser, and is free forever.
Mixed indentation is the number-one Markdown rendering inconsistency. The normalizer replaces every tab with your chosen number of spaces (default 2). Code block contents are never touched.
For list indentation specifically, see the List Style Unifier.
Invisible trailing spaces cause noisy diffs and confuse linters. The normalizer strips them from every line while preserving the two-space hard line break that Markdown uses for <br> tags.
Windows-style CRLF endings and the invisible BOM byte (U+FEFF) often sneak in when files cross operating systems. Both are cleaned in a single pass.
If you also need to fix typographic characters pasted from Word, try the Smart Quote Fixer.
Three or more consecutive blank lines are collapsed to a single blank line. The final output is guaranteed to end with exactly one newline (toggle off if your workflow differs).
Paste any Markdown document into the input, or click Load example.
All seven normalizations are on by default. Disable any you want to skip.
Click Copy normalized Markdown and paste back into your editor or commit.
Run the normalizer before committing to pass linter checks without manual edits.
Normalize contributed docs to match project style in one click.
CMS exports often have mixed tabs, CRLF, and trailing spaces. Clean everything at once.
Windows and macOS line endings differ. Normalize to LF before merging.
Clean up invisible formatting issues before submitting Markdown documents.
Yes. Free forever, no account required.
Tabs, trailing spaces, CRLF endings, BOM characters, excess blank lines, and missing final newlines.
No. Fenced code block contents are never modified.
Yes. Two trailing spaces for Markdown hard breaks are kept.
A Byte Order Mark (U+FEFF) sometimes added by Windows editors. Invisible but can break parsers.
No. Runs 100% in your browser.