Source first
Every source-line change remains visible even when it is not classified as a structure change.
Compare Markdown source and structure.
Review Markdown side by side and locate changes across headings, lists, tables and code blocks.
Runs locally in your browserFiles are not uploaded or storedNo sign-upPreparing required files for offline use…
How Diff Master compares Markdown
Markdown Diff combines a complete source comparison with structure-aware detection for headings, lists, GitHub-style tables and fenced code blocks.
- Paste the original Markdown and the changed Markdown.
- Compare locally to calculate source differences and classify supported structure changes.
- Select a structure change to move to the nearest changed source line.
Structure detection
Headings, lists, tables and fenced code blocks receive additional labels and navigation.
Safe reading
Markdown, Mermaid definitions and embedded code are compared as source and are not executed.
Original Markdown
## Install Run `pnpm install`.
Changed Markdown
## Setup Run `pnpm install`.
Expected result: The source line is modified and the heading is also reported as a structure change.
Markdown comparison FAQs
Practical answers about how this tool compares content, what stays local and where its current limits are.
What Markdown changes are detected?
Diff Master compares the source line by line and also identifies changes to headings, lists, GitHub-style tables and fenced code blocks.
Does Markdown Diff render a live preview?
Not in the current version. The result compares Markdown source and reports structural changes so you can review exact syntax without executing embedded content.
Does it support GitHub Flavored Markdown?
The structure parser supports common GitHub Flavored Markdown features such as tables and task-list syntax. Source differences remain visible even when a construct is not classified as a structure change.
Are Mermaid diagrams rendered?
No. Mermaid blocks are treated as fenced Markdown code and compared as source. Diff Master does not render or execute diagram definitions.
Is my Markdown uploaded or stored?
No. The Markdown parser and comparison engine run locally in your browser, and Diff Master does not upload or store either version or the result.