Text Diff Checker
Paste two versions of anything and see every added and removed word or line highlighted instantly.
Differences
How to read the result
The result panel merges both versions into one view. Text that only appears in the changed version is highlighted with a green background - those are your additions. Text that was in the original but removed shows in red with a strikethrough. Everything left plain is unchanged. The counters above tally how many words or lines were added and removed, giving you a quick sense of the size of the edit.
Word mode vs line mode
Use word mode for prose: essays, emails, product descriptions and anything where a reworded sentence is the unit of change. It pinpoints the exact words that moved so a one-word tweak does not light up the whole paragraph. Use line mode for code, CSV data, logs and lists, where a line is the meaningful unit and you want to see which lines were touched, the way a version-control diff works.
Practical uses
- Checking what an editor changed between two drafts
- Spotting the difference between two config files or code snippets
- Confirming a copy-paste is identical to the source
- Reviewing contract or policy wording changes before signing off
Comparing large blocks pasted from PDFs? Run each side through the line break remover first so stray wrapping does not show up as false changes. You can also find and replace to normalise wording, or count the words in each version.
Getting a clean comparison
A diff is only as good as the two inputs. If one version was copied with different line wrapping, invisible trailing spaces or curly quotes swapped for straight ones, those show up as changes even though the text reads the same. When that happens, normalise both sides first: strip stray breaks, standardise the quotes, then compare. In line mode, remember that a single changed character marks the whole line as removed and re-added, because the line is the unit - switch to word mode if you need to see the exact character that moved.
Everything is computed with a well-tested diffing algorithm the moment you stop typing, so you can paste, tweak an option and see the result update without a button press. Because it is all local, there is no size limit beyond what your browser can hold, and no privacy trade-off for pasting sensitive drafts.