Text Diff Checker
Find added and removed lines between two versions, side by side
Legend: - removed + added space unchanged
How to use
- Paste the old version into "Original text", one per line.
- Paste the new version into "Compare text", one per line.
- Click "Compare"; results are colored:
-removed,+added, space unchanged. - Click "Clear" to reset both sides.
- Tip: comparison is line-by-line, so a changed line shows as removed plus added.
FAQ
What is the comparison algorithm?
A line-by-line diff based on the Longest Common Subsequence (LCS), which stably finds added, removed and unchanged lines, ideal for version comparison.
Why are some lines marked removed instead of modified?
The tool compares by whole lines; a changed line is treated as "old line removed + new line added" and does not do intra-line character-level comparison.