Diff Checker Online
Compare two texts line by line and see exactly what was added, removed or changed. Free, instant and private — texts stay in your browser.
Frequently asked questions
How are differences highlighted?
Removed lines are shown in red, added lines in green, matching context lines stay neutral.
Can I compare code files?
Yes, paste any source code — the comparison is line-based and works for code, configs and prose alike.
Is there a size limit?
The tool comfortably handles texts up to a few thousand lines; beyond that the comparison may take a moment.