Paste an original version into the left box and a modified version into the right box. The comparison highlights added lines in green and removed lines in red, line by line, so you can spot exactly what changed without reading through both versions manually.
The tool compares text line by line rather than character by character — each line in the original is matched against the corresponding line in the modified text, with unmatched lines marked as additions or removals.
Does it highlight word-level changes within a line?
The current comparison works line by line — if even one character in a line changes, the whole line is marked as removed and added. This makes large changes easy to spot at a glance.
Is there a limit on how much text I can compare?
There's no fixed limit — the comparison runs in your browser, so very large documents depend on your device's available memory.
Does it matter which version goes in the left box?
Yes — the left box is treated as the "original" and the right as the "modified" version, so lines only in the left are shown as removed, and lines only in the right are shown as added.
Can I use this to compare two versions of code?
Yes — the line-by-line comparison works for any plain text, including source code, configuration files, and structured data, not just prose.