A worked example
Replace the second line
- Start with
- Original: A then B on a new line · revised: A then C
- Check the result
- A remains unmarked, followed by − B and + C.
The entire line is compared; individual changed characters are not highlighted.
Images & Documents tool
Text Diff Checker
Compare original and revised text at matching line numbers, with markers for removed and added lines.
Lines are compared by position; an inserted line does not realign later matches.
3 lines
3 lines
Change markers
Read minus and plus lines together
Place the versions side by side
Enter the original and revised text, then select Compare. Blank lines and whitespace differences count too.
Read the markers
Unchanged lines have two leading spaces. Changed original lines have − and revised lines have +, so one replacement appears as two output lines.
Check after an insertion
Adding a line near the start shifts later comparisons. If many lines are marked, look for the insertion that changed their positions.