How to compare two Markdown documents
See exactly what changed between two versions of a Markdown file — added and removed lines, side by side — without needing Git or a code editor.
When two versions of a document exist — a draft and an edit, yours and a collaborator's — the question is always what actually changed? The Markdown Diff Checker shows you, line by line, no Git required.
How to read a diff
Paste the original on one side and the changed version on the other. The result marks every line:
- Lines prefixed
-were removed. - Lines prefixed
+were added. - Unmarked lines are unchanged, shown for context.
A changed line appears as a removal followed by an addition, so you see the before and after together.
Why a diff beats re-reading
Re-reading two long documents to spot differences is slow and error-prone — the eye glides over a changed word in a sea of identical text. A diff isolates only what moved, so a one-word edit in a 2,000-word document jumps out instantly.
Where it helps
- Reviewing edits before accepting a collaborator's changes.
- Checking AI revisions — what did the rewrite actually change?
- Comparing two near-identical files to find the one difference.
- Spotting accidental changes — a deletion you didn't mean to make.
Related tools
To merge two versions instead of just comparing them, Markdown Merge Tool combines them. To annotate changes inline for a reviewer, Track Markdown Changes marks insertions and deletions in CriticMarkup.
Privacy
Both documents are compared in your browser — neither is uploaded, so it's safe for confidential drafts.
Paste both versions, read only what changed, and review with confidence.