Text Diff Checker
Paste two versions of any text — an email draft, config file, code snippet or contract paragraph — and see exactly what changed, line by line.
How the comparison works
This tool uses a classic dynamic-programming diff (the same family of algorithm behind git diff): it finds the longest sequence of lines the two texts share, then marks everything outside that shared backbone as added or removed. Lines are compared after trimming trailing whitespace, so a stray space at a line's end won't register a false change — but indentation at line start counts, because in code and YAML it is the meaning.
Nothing you paste is uploaded anywhere — the diff runs in a blink of JavaScript with no network. Handy for: spotting what a "helpful" colleague changed in your config, reviewing a contract redline without PDF tools, checking a translation against its source, or finding why that copied Stack Overflow snippet broke.