Compare Markdown
Compare two Markdown files online in three modes: structural by heading and block, rendered as HTML, or exact source text. Free, with no upload.
Files never leave your browser.
About Markdown Diff
Compares two Markdown files at three levels: structural (headings, paragraphs, code blocks), rendered HTML, or raw source. Useful for tracking docs changes that source-diff alone obscures.
How to use
- Paste or load both Markdown files.
- Set Compare as to Document structure, Rendered preview, or Source text under Options.
- Inspect changes per block: headings, code blocks, lists, paragraphs.
Try a sample
A README with install-instruction edits and a new examples link.
What this tool doesn't handle
- Custom Markdown extensions (GFM-only features, MDX) may not parse identically to your renderer.
- Embedded HTML in Markdown is treated as opaque content.
Frequently asked questions
Do my files ever leave my browser?
No. Every comparison runs locally in your browser. Nothing you paste, drop, or load is uploaded to a server; the tool keeps working even if you go offline after the page loads.
Is this tool free to use?
Yes. All DiffResolver tools are free, with no account, sign-up, or installation. Because processing happens on your device, there are no server-imposed usage limits.
Which comparison mode should I pick for Markdown?
Document structure for docs reviews: changes are grouped by heading, paragraph, and code block. Rendered preview shows the result as HTML. Source text compares raw characters, which matters for front matter and exact formatting.
Is GitHub-flavored Markdown supported?
Core Markdown parses fully; some GFM extensions and MDX may parse differently from your renderer. Source mode is always exact regardless of dialect.
Is there a file size limit?
No server limit applies, because nothing is uploaded. The memory of your device sets the practical limit. Above 10 MB for text, 40 MB for images, 100 MB for documents, or 500 MB for archives, the tool warns you that the work can be slow, but it never blocks the file.
Does this tool work offline?
Yes. The browser keeps a copy of the tool after the first visit, so a page you opened before still works without a network. You can also install DiffResolver as an app from the browser menu. Installation stays optional; the site works the same in a normal tab.
Where is my data stored?
Your files are stored nowhere. They stay in the memory of the page and are gone when you close the tab. Only what you save yourself stays in this browser: a snapshot, your tool options, and your theme. To remove it, open Settings and select Clear all local data.