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Diff

A diff (short for difference) is a comparison of two texts that highlights exactly what changed — which lines were added, removed, or modified. Diffs are the foundation of version control (git diff), code review, and document comparison. This tool shows you the same kind of output with line, word, or character granularity, plus side-by-side and inline views.

Invisible characters are Unicode code points that take up no visible space or look like normal spaces: zero-width spaces (U+200B), zero-width joiners (U+200D), no-break spaces (U+00A0), byte-order marks (U+FEFF), and thin spaces. They're often invisible in editors, so two files can look identical yet contain different bytes — which breaks code, comparisons, and automated checks. Most diff tools ignore them entirely; this tool flags them explicitly.

No. Everything runs locally in your browser — your code, documents, and data never leave your device. There is no server, no account, and no tracking. This matters when comparing proprietary source code, drafts under embargo, or personal documents.

Line diff compares whole lines and is best for code and structured text. Word diff compares within lines, highlighting the exact words that changed — best for prose and documents. Character diff compares every individual character, which is essential for finding invisible-character changes and byte-level differences.

Almost always because of invisible characters: a zero-width space, a BOM at the start of the file, a no-break space where a regular space should be, or mixed line endings (CRLF vs LF). These characters are real bytes but render invisibly. Switch to character granularity and check the invisible-character panel — the tool will name exactly which code points differ and where.

Yes — completely free, no account, no watermark, no usage limits. Popular alternatives are freemium or server-side: diffchecker limits pastes and uploads them to their cloud, which is a problem for proprietary code.