Markdown Diff & Compare

Use a local line-based LCS diff to show added, removed, and unchanged Markdown lines for documents up to 600 lines per side.

Original Markdown

Changed Markdown

0Added lines

0Removed lines

0Unchanged lines

ReadyThis is a line-based LCS diff for Markdown source, capped at 600 lines per side to avoid expensive quadratic browser work.

Renderer handoff review

Review the Markdown you will actually publish

The review follows the source or generated Markdown for this tool, checks structural handoff risks, and keeps CommonMark/GFM/host-specific boundaries visible before copy or export.

Reviewing current Markdown

Review scope—

Headings—

Fenced code—

Links / images—

Renderer-dependent features

—

Handoff findings

Copyable handoff summary

Review summary will appear here.

CommonMark defines the core syntax, while GitHub Flavored Markdown and publishing systems add extensions such as tables, task lists, autolinks, footnotes, front matter and renderer-specific raw-HTML behavior. This review is local and never fetches links.

Line-change summary & unified patch

Count added, removed and unchanged lines, then export a compact unified patch that can be reviewed separately from rendered Markdown.

—Added lines

—Removed lines

—Unchanged lines

Ready.

What this Markdown result proves

Markdown portability depends on the exact source and the renderer that consumes it.

What to review before handoff

Review fences, headings, links, extension syntax and generated output before publishing; source-level checks do not prove remote links or repository-specific style rules.