Paste the original and the changed text to see every line that was added, removed or changed, with the changed words marked inside each line. Side by side or inline, ignoring spaces or case if you like.
Tick Compare as JSON and both sides are formatted the same way and their keys sorted before comparing, so only real changes in the data show, not changes in spacing or key order.
It finds the smallest set of line changes with the Myers algorithm (the one git uses), then compares the words inside each changed line. Long stretches with no changes are folded; tap to show them.
No. Both texts are compared in your browser, so it’s safe for code, contracts and private notes.
Yes: use the folder button on each side to open a text file, or drop one onto the box.
Tens of thousands of lines each work. Very large files with changes everywhere take longer, as with any diff.
Open all 35 Dev Tools. Everything runs in your browser; nothing you paste is uploaded.