Spot every change
Comparing documents by eye misses things. This checker uses a proper longest-common-subsequence comparison (the method behind tools like Git), so an inserted line shows as one addition rather than shifting everything after it into “changed”.
Changed lines are paired up and the exact words that differ are highlighted. Ignore case or extra spaces to focus on real changes, show only the lines that changed, and see a similarity score.
How to compare two texts
- 1
Paste the original
In the left box.
- 2
Paste the new version
In the right box.
- 3
Review the differences
Red lines were removed, green lines were added, highlighted words changed.
- 4
Refine
Ignore spaces or case, or show changed lines only.
Key features
Accurate line diff
Insertions and deletions detected properly.
Word-level highlights
See exactly which words changed inside a line.
Line numbers
Old and new line numbers side by side.
Private
Contracts and code are compared locally, never uploaded.
Common uses
- Contracts and policies: Find what changed between drafts.
- Writing and editing: Review edits from a colleague or editor.
- Code and config: Compare snippets or settings files quickly.
Tips and good to know
- Very large texts (tens of thousands of lines) may be summarised as a block change to keep the browser responsive.
- Comparing PDFs? Convert them with PDF to Word or copy their text first.