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Setting up your workspace on this device.
Compare two texts and highlight the differences.
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Setting up your workspace on this device.
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Diff Checker compares two versions of a text and highlights what changed. Paste the original on one side and the updated version on the other, and the aligned comparison marks each line as added (green), removed (red), modified (amber) or unchanged, with line numbers for both versions. In modified lines the edited part is highlighted, so a changed word or number is easy to spot. Tick Ignore whitespace-only differences to skip changes in indentation or spacing, and counters show the total of each type. The comparison updates as you type and runs in your browser.
Paste both versions
Put the original in Original text and the new version in Updated text, or press Load sample.
Choose whitespace handling
Tick Ignore whitespace-only differences if indentation or spacing changes do not matter.
Review the changes
Scan the colour-coded rows and the Added, Removed, Modified and Same counters.
Paste one version into each box. The diff updates instantly, marking added lines in green, removed lines in red and changed lines in amber.
Lines are matched first, so inserted and deleted lines line up correctly. Within a modified line, the stretch from the first to the last changed character is highlighted, so small edits stand out.
Yes. Tick Ignore whitespace-only differences and lines that differ only in leading, trailing or repeated spaces are treated as the same.
No. The comparison runs in your browser, so contracts, code and private notes stay on your device.
Yes. Diff Checker is completely free, with no account, no paywall, and no usage limits.
No. Diff Checker works instantly in any modern web browser — there is no software to install, no extension, and no sign-up.