6XC

Text Compare (Diff Checker)

Paste two texts and see exactly which lines were added, removed or unchanged — a clean line-by-line diff in your browser.

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Spot Every Changed Line

Paste the original text on the left and the revised text on the right; the tool aligns them with a longest-common-subsequence diff and marks each line as added (green), removed (red) or unchanged. Contract revisions, config file edits, essay drafts, translated copies — anywhere "what exactly changed?" matters.

Comparison runs entirely in your browser, so it is safe for private documents. Line counts and a change summary appear above the result; the diff updates live as you edit either side.

Frequently Asked Questions

Does it compare word by word or line by line?

Line by line — the standard for documents and code. A modified line therefore shows as one removed plus one added line, which keeps the result easy to scan.

Is there a size limit?

The algorithm handles thousands of lines comfortably. For very large files (tens of thousands of lines), the browser may take a moment — the work stays on your device either way.

Are my documents uploaded?

No. Both texts are compared locally in your browser and vanish when you close the page.

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