Markdown Diff Checker
Paste two versions of Markdown to compare additions, removals and edited lines with Markdown syntax highlighting. The diff runs locally in your browser.
Original text
Changed text
Markdown syntax locked
This page automatically highlights Markdown tokens, so you do not need to pick a language before comparing files.
Private local compare
The diff runs in your browser. Source code, API payloads and configuration files are not uploaded to a server.
Split or unified review
Use split view for side-by-side review, unified view for compact patches, and hide unchanged lines for large files.
Compare Markdown files online
This Markdown diff checker is built for developers who need a fast, private way to compare code and configuration changes. Paste two versions, run the comparison, and review additions, removals and inline edits with Markdown syntax highlighting already enabled.
Paste or upload the original Markdown file on the left.
Paste or upload the changed Markdown file on the right.
Compare the result in split or unified view, then hide unchanged lines when you only need the edited regions.
Private browser-based Markdown comparison
The diff runs locally in your browser, which keeps source code, API responses, secrets and configuration files on your device. One recent session may be stored in your browser storage for restore, and you can clear it from the tool at any time.
Common Markdown diff workflows
Review heading, link and code block changes.
Check release notes before publishing.
Markdown syntax highlighting
Highlighting is locked to Markdown on this page, so the language selector stays out of the way. The parser focuses on tokens such as headings, links, lists and code fences while the diff engine highlights the actual text changes.
.md, .markdown, .mdx
Reference: CommonMark specification
Markdown diff checker FAQ
What does the Markdown diff checker do?
It compares two versions of Markdown and highlights added, removed and edited lines. Syntax highlighting is locked to Markdown, so language tokens are easier to scan while you review changes.
Does the Markdown diff checker upload my files?
No. The comparison runs in your browser. Your files are not uploaded to a server when you click Compare.
Which Markdown file types can I compare?
You can paste or upload plain-text files such as .md, .markdown, .mdx. Any text file can be compared, but this page highlights Markdown syntax automatically.
Can I compare large Markdown files?
Yes. Comparisons run in a background worker so the browser stays responsive. Very large files may still take a few seconds on your device.