The original document and the one that came back.
The text is compared and the differences highlighted.
You see what was added, removed or changed.
The file does not leave your device. Thirty-two tools out of thirty-eight.
The comparison is on the text: that is usually where the changes that matter live. A layout shift that does not change the words is not flagged as a substantive difference.
OCR is needed on both first: without a text layer there is nothing to compare. Bear in mind too that OCR inaccuracies can show up as differences that are not really in the document.
No: the comparison happens in the browser, on your device, and the files are not uploaded to Plicum servers.
It opens in your browser, nothing to install. Five operations a day are free, with no payment details.