Compare two text versions
Paste the original text on the left and the modified text on the right. Switch to diff mode to see added and removed content. Use Swap when the inputs are reversed, or Clear to empty both panes.
The checker normalizes line endings before comparison, so Windows and Unix newline differences do not create extra noise.
Diff views
Character view marks individual character changes. Word view keeps whitespace in the comparison and is better for prose. Line view gives each changed row a marker and line number. Patch view creates a unified patch labeled original.txt and modified.txt.
For long files, line or patch view is the better first pass. Character and word diffs can become expensive on large pasted documents.
Large input limits
Diff calculation has a timeout guard. If the comparison is too large or too slow, the output reports that it was aborted. Reduce the input size or switch to line or patch view.