Compare two texts line by line and see what changed. Nothing is uploaded.
The Text Diff compares line by line with the diff library's Myers-family algorithm — the same class git uses — and counts added and removed lines, entirely in the browser.
A line diff shows what changed between two versions of a text: config files, SQL dumps, API responses, contract clauses. Removed lines are marked with a minus, added lines with a plus, and unchanged lines stay muted so the changes stand out.
Both texts are split into lines and compared with the diff library's diffLines function — the same Myers algorithm family used by git. The optional whitespace toggle ignores leading, trailing and internal whitespace differences when deciding whether two lines are equal. Everything runs in this tab.
No. This page never sends your input to a server — formatting, decoding and hashing all run in this tab, on this device.How that works.
It is the same class of algorithm, so results are usually identical for line-level changes. Git adds context headers and rename detection that this tool intentionally leaves out.
No — this tool works at line granularity. A changed line shows up as one removed line plus one added line rather than a character-level highlight.
Lines that differ only in whitespace — indentation, trailing spaces, tabs versus spaces — are treated as equal. Useful when comparing reformatted code or copy-pasted text.
Only your browser's memory. Diffing is O(ND) in the worst case, so two very large, very different texts can take a moment, but nothing is sent anywhere.
Browse alltext toolsor thefull tool directory.