Paste two versions and see what changed, line by line, with additions and removals marked. Whitespace and case can be ignored when the difference you care about is the words rather than the formatting. Everything runs in your browser, so contracts and drafts stay on your machine.
It finds the longest common subsequence — the largest set of lines that appear in both texts in the same order — and marks everything else as added or removed. That is why inserting a single line near the top shows as one insertion, rather than flagging every line below it as changed, which a naive line-by-line comparison would do.
A modified line has no special status: it appears as one removal and one addition, because at the line level that is what it is.
When the text has been re-wrapped or reformatted and every line would otherwise show as changed. Leave it on when whitespace carries meaning — indentation in code, alignment in fixed-width data, or anywhere a trailing space is the difference you are hunting for.
Note that the comparison normalises but the display does not: what you see is always the original text, so you can still spot the whitespace that the comparison chose to overlook.
The whole comparison runs in your browser. No request is made, which makes this usable for contracts, drafts, and anything else you would not paste into a website you do not control.
It finds the longest common subsequence — the largest set of lines appearing in both, in the same order — and treats everything else as added or removed. That is why inserting one line at the top shows as a single insertion rather than marking every following line as changed.
When comparing text that has been reformatted or re-wrapped, where every line would otherwise show as changed. Keep it on when whitespace is meaningful — indentation in code, or spacing in fixed-width data.
No. The comparison runs in your browser with no network request, which makes it safe for contracts, drafts and anything else you would not paste into a website.
Steuervergleich Kanton Zürich — Gemeindesteuern vergleichen (Deutsch)