Text Diff Checker
Compare two blocks of text and highlight added, removed and changed lines instantly.
Knowledge Base & Educational Companion: How text diffing works
A diff compares two versions of text and reports the minimal set of changes between them. It is the engine behind version control, code review and document revision tracking.
1. Line-based comparison
Most diffs work line by line, marking each line as unchanged, added or removed. This keeps changes readable and maps naturally to how people edit documents and code.
2. The longest common subsequence
Diff algorithms find the longest sequence of lines both versions share, then treat everything else as insertions or deletions — the mathematically minimal edit.
3. Private comparison
Because this tool diffs entirely in your browser, you can safely compare confidential contracts, drafts or code without anything leaving your device.
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