Diff Checker
Paste two versions of text and see exactly what changed, line by line. Added lines in green, removed in red. Private and instant.
See what changed at a glance
Paste an old version on the left and a new one on the right, and this diff checker lines them up and highlights the changes. Added lines show up tinted green, removed lines tinted red, and untouched lines stay neutral, so you can scan a config file, a contract, or a draft and spot every edit. It runs entirely in your browser, so the text you compare is never uploaded anywhere.
Compare against versions you saved
A diff is only as good as the older copy you kept. Relic quietly keeps an end-to-end encrypted history of everything you copy, searchable on every device, so the earlier version you need to compare against is still there when you go looking. The diff is free. Having the old copy at all is what Relic gives you.
Frequently asked questions
How do I compare two texts?
Paste the original version on the left and the changed version on the right. The tool lines them up and highlights the differences underneath: added lines in green, removed lines in red, and unchanged lines left neutral, with a running count of additions and removals.
How does the diff decide what changed?
It compares line by line using a longest-common-subsequence match, which is the same idea code diff tools use. That lets it find the lines that stayed the same and mark only the genuine insertions and deletions around them, rather than flagging everything after the first edit.
Does it compare word by word or line by line?
Line by line. A line that changed at all shows up as one line removed and one added, rather than highlighting the specific words within it. For prose where you want to see edits inside a line, line-level diffs are still usually enough to spot what moved.
What does it show if the two texts are identical?
It tells you the two texts are identical and shows zero additions and zero removals, so you get a clear confirmation rather than an empty result and a guess about whether it worked.
Is it safe to compare private or sensitive text here?
Yes. The comparison runs entirely in your browser, so both versions you paste, config files, contracts, drafts, whatever, never leave your device or get uploaded.