Strip extra whitespace, collapse blank lines, and shrink a Markdown file without breaking it.
Free Markdown Minifier shrinks a Markdown file without breaking the rendered output. It collapses multiple blank lines to one, trims trailing whitespace, strips HTML comments, and preserves everything inside code blocks byte-for-byte.
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.
Shrinking a markdown file before shipping it shouldn't cost anything. The minifier runs entirely in your browser.
| Input | Output | Typical size | Speed | Login needed |
|---|---|---|---|---|
| Markdown (.md) | Minified Markdown (.md) | Any document size | < 20 ms for typical docs | 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.
With the default options (remove HTML comments, trim trailing whitespace, collapse blank lines, trim end of document), the minified output renders identically to the original in every Markdown renderer. The semantic whitespace rules are preserved: one blank line between paragraphs, blank line before fenced code blocks, etc.
For full formatting cleanup (heading spacing, list unification) instead of just size reduction, use the Free Markdown Formatter.
Content inside ``` and ~~~ fenced code blocks is preserved byte-for-byte. The minifier splits the document into inside-fence and outside-fence segments and only processes the outside segments. Your code examples, YAML frontmatter inside code fences, and command-line snippets stay exactly as written.
HTML comments (<!-- ... -->) are removed by default. Useful for stripping TODO notes, editor directives, and IDE metadata before publishing. Toggle off to preserve them.
Two additional options can shrink further but may affect rendering: Remove all blank lines (turns a multi-paragraph document into one block — breaks rendering in most renderers) and Collapse spaces within lines (may affect code indentation outside code blocks, precise whitespace for HTML-in-MD, etc.). Both are off by default.
For semantic analysis instead of size reduction, try Free Markdown Word Counter.
The original and minified byte counts are shown live, along with the percent reduction. You can see instantly whether aggressive options are worth the risk.
Paste the document you want to shrink.
Safe defaults (collapse blank lines, trim trailing, remove comments) never break rendering.
Click Copy minified or Download .md to save the smaller file.
Shrink a bloated README.md before a release tag — smaller repo, faster clones.
Reduce build output size across hundreds of markdown posts in a single pass.
Clean up whitespace accumulated from copy-paste drafts over time.
Remove TODO comments and trailing whitespace before shipping a post.
Minify archives of old markdown content before storing long-term.
Yes. Free forever, no account required.
Not with the default options. The two aggressive options (remove all blank lines, collapse spaces) may affect rendering — use carefully.
Yes. Content inside triple-backtick and triple-tilde fences is never modified.
Varies by input. Heavily-whitespaced documents may shrink 15-30%. Clean documents shrink 1-5%.
No. Runs 100% in your browser.