Compare two blocks of text or code side by side. See line-by-line differences with character-level highlighting — nothing leaves your browser.
Nothing is sent to the server — all processing happens in your browser.
A diff(short for “difference”) is a comparison between two versions of a text. It shows which lines were added, which were removed, and which stayed the same — making it easy to see exactly what changed between an original and a modified version.
The unified diff format presents both versions in a single column, using + prefixes for added lines and -for removed lines. It's the format used by git diff and most version control systems. The side-by-side format places the two versions in adjacent columns, so you can visually align corresponding lines.
Most diff tools stop at the line level: they tell you which lines changed, but not what changed within those lines. This tool goes further with intra-line highlighting — it analyses the specific words and characters that differ within each changed line, highlighting them so you can see at a glance whether a typo fix, a variable rename, or a value change is responsible.
For example, if the only change on a line is “port 80” becoming “port 443”, the surrounding text stays unhighlighted while just the changed portion is emphasised — saving you from scanning entire lines to find a single-character difference.
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