Text Diff Checker
Compare two versions line by line and identify unchanged, added, removed and paired changed entries.
What is this tool?
A lightweight longest-common-subsequence comparison aligns matching lines, then labels unmatched content as additions, removals or adjacent changes.
How to use it
- Paste the original version on the left.
- Paste the updated version on the right.
- Select Compare texts.
- Review colored line labels and the summary.
Example
Changing beta to beta updated produces paired changed entries; adding delta produces an added line.
FAQ
Is comparison character-based?
No. Results are line-based for clarity and low browser overhead.
Is there a size limit?
The page accepts up to 500 lines on each side to prevent expensive browser work.
Does whitespace matter?
Yes. Lines must match exactly, including spaces.