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ToolWrenPaste two versions of text to see exactly what changed. Added lines are highlighted in green and removed lines in red, with a quick summary.
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Text Diff is a free, private online tool that lets you compare two blocks of text line by line and highlight what was added, removed or changed. It runs entirely in your browser, so nothing you enter is uploaded to a server.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
The tool uses a longest-common-subsequence algorithm to align the two texts, then marks each line as unchanged, added or removed — the same approach behind code review diffs.
Compare two drafts of an article, two config files, or two versions of code to spot exactly what's different without reading every line.
Both texts stay in your browser. Nothing is uploaded, so it's safe for confidential documents.
A text diff checker compares two pieces of text and highlights exactly what changed between them - which lines were added, removed or kept the same. It is the same idea behind code review and version-control diffs, applied to any text: documents, configs, lists or code snippets.
The tool aligns the two texts using a longest-common-subsequence algorithm - the standard approach that finds the largest set of lines appearing in both, in order, then marks everything else as an insertion or deletion. This produces the minimal, most readable set of changes rather than flagging everything after the first difference.
Line-by-line comparison is the most useful granularity for most real text - paragraphs, list items, config entries and lines of code are natural units. Additions are shown in green and removals in red, with a count summary, so you can see at a glance how much changed and exactly where.
Diffing is invaluable for spotting edits between two drafts of an article, finding what changed between two versions of a config file or contract, comparing data exports, reviewing someone's edits, and checking code changes outside a formal version-control system. It turns 'something changed but I cannot see what' into an instant answer.
Paste the original on one side and the changed version on the other; differences are highlighted as you type. Because the comparison runs entirely in your browser, it is safe for confidential documents, contracts and proprietary code - nothing is uploaded. Everything works offline once loaded.