Text Diff Checker
Compare two texts side by side and see exactly what changed, with added and removed lines highlighted.
About Text Diff Checker
Version confusion is a fact of editing: the draft on your laptop differs from the copy in the shared drive, and nobody is sure what changed. Scanning two long documents side by side by eye misses small edits that can completely change the meaning.
Paste the original and edited versions and the tool highlights added lines in green and removed lines in red, comparing line by line first and then word by word inside changed lines for precise highlighting. A summary shows the count of additions and deletions so you know at a glance how much actually moved.
Editors and reviewers tracking document revisions, developers comparing config and code snippets, and writers merging feedback all rely on it. It turns the 'what changed?' question into a one-second answer.
How to Use
- Paste the original text in the left box.
- Paste the edited version in the right box.
- Review the highlighted differences.
Example
Original: "Hello world" / New: "Hello there world" Added: "there"
The diff engine compares line by line and highlights 'there' as inserted while everything else remains unchanged.
FAQ
How are differences highlighted?
Added lines show in green and removed lines in red, with a summary showing the count of each.
Does it compare word by word or line by line?
It compares line by line first, then word by word within changed lines, giving more precise highlighting.
Is it as good as a desktop diff tool?
For two documents of a few hundred lines, yes. It covers the common case of comparing pasted versions of a file.
How does word-level comparison improve the diff?
Instead of marking an entire paragraph as changed, the tool highlights only the words that differ, making small edits inside long lines much easier to spot at a glance.
What does the added or removed summary show?
It reports the number of added lines and removed lines separately, so you can see whether the edit grew or shrank the text before reading the detail of each change.