what can i use a text diff for?

spot changes between two versions of a signed message, two mirror pages of the same onion site, or two pgp notes you suspect were edited. every added, removed and unchanged line is shown.

is my text uploaded anywhere?

with javascript on, the comparison runs entirely inside your browser tab and nothing is sent anywhere. with javascript off it runs on the server during that one request - the texts are compared in memory, shown back once and never stored or logged.

what do the colors mean?

green lines exist only in version b (added), red lines exist only in version a (removed), plain gray lines appear in both unchanged. a line moved to a different position shows as one red and one green line, since the tool matches lines by content, not position.

how big can the texts be?

up to 1000 lines per side. beyond that the comparison gets memory-hungry in a browser tab, so the tool stops and tells you instead of freezing your page.

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text diff

paste two texts, hit compare, and see line by line what changed. handy for spotting edits between two versions of a signed message, checking whether two mirror pages really serve the same content, or finding out if someone touched your pgp notes.

javascript is off - the comparison runs on the server instead: the texts are compared during this one request, shown back to you once and never stored or logged.

faq

is my text uploaded anywhere?: with javascript on, the whole comparison happens in your browser tab and nothing leaves your machine. with javascript off, it runs on the server for that one request - compared in memory, shown once, never stored or logged.
what do the colors mean?: green lines were added in version b, red lines were removed from version a, gray lines are unchanged in both.
does a trailing newline count as a change?: it gets its own gentle note in the stats line instead of painting a whole fake removed+added pair of lines.
how big can the texts be?: up to 1000 lines per side - beyond that the comparison gets memory-hungry in a browser tab, so the tool stops and says so instead of freezing your page.
what if a line just moved position?: lines are matched by content, not position, so a moved line shows up as one removed and one added line rather than two changed lines.

related tools: sha-256 checksum to fingerprint each version and see if they differ at all, or the pgp armor cleaner to repair copy-paste damage before you compare two signed messages.

text diff

paste both versions

compare them