Paste two texts side by side to compare them. Differences are highlighted line by line — added, removed and changed lines shown in distinct colours.
A diff checker compares two texts and highlights the differences — added lines in green, removed lines in red. It is commonly used to compare code versions or document revisions.
Yes. All comparison happens entirely in your browser. Your text is never sent to any server.
Yes. Paste any text or code into the two panels and click Compare. The tool highlights differences line by line.
The tool uses a unified diff view with added lines highlighted in green and removed lines in red, making changes easy to spot.
Yes. The diff checker works with any plain text — JSON, JavaScript, Python, HTML, CSS, XML or prose. Paste your code into the two panels and click Compare to see a line-by-line diff.
Open both files in a text editor, copy the content of each, then paste them into the left and right panels of the diff checker. Click Compare to highlight all differences instantly.