Diff Checker
Paste two versions of any text to see what changed line-by-line. Toggle between inline and side-by-side views. Copy the result as a standard patch file. Runs entirely in your browser — nothing is sent to a server.
What is a diff?
A diff shows the minimum set of changes needed to transform one text into another. Lines prefixed with + appear only in the modified version; lines with - only in the original; unmarked lines are identical.
Unified diff format
The "Copy patch" button copies a standard GNU unified diff. This format is accepted by git apply, patch, and most code review tools — useful for sharing changes without transmitting the full files.
Side-by-side vs. inline
Side-by-side is easier to read for large changes where context matters. Inline is more compact and better on narrow screens. Both views show identical information.
