Text Diff Checker
Compare two texts and see exactly what changed — free, instant, and entirely private.
How it works
Paste your original text on the left and the changed version on the right. This tool compares them directly in your browser using jsdiff, a well-tested diffing library, and highlights every difference: removed content in red with a strikethrough, added content in green. Nothing is uploaded — the entire comparison happens client-side.
Switch between line mode (compares whole lines — best for code, config files, or structured text where line boundaries matter) and word mode (compares individual words within the text — best for prose, articles, or contracts where you want to spot a single changed word inside an otherwise identical paragraph).
Useful for reviewing edits to a document, comparing two versions of a config file, spotting what changed between two API responses, or checking a translation against its source without needing a code editor's diff view.
Limitations
This tool compares exactly two texts at once — there's no three-way merge or multi-file comparison. Very large inputs (megabytes of text) may take a moment to compute since the diffing algorithm runs in your browser's main thread.
FAQ
- Is this text diff tool really free?
- Yes — completely free, with no limits and no account required. The comparison runs entirely in your browser.
- What's the difference between line and word mode?
- Line mode compares the two texts a whole line at a time, so any change to a line marks the entire line as removed and its replacement as added — good for comparing code or structured text. Word mode compares word by word within a line, so a single changed word is highlighted on its own — good for comparing prose or paragraphs.
- Is my text uploaded anywhere?
- No — the comparison uses the jsdiff library running locally in your browser. Neither text is ever sent over the network, so it's safe to compare sensitive documents, contracts, or code.
- Can it compare more than two pieces of text?
- Not right now — this tool compares exactly two texts (original vs. changed) at a time. For comparing more, run it pairwise.