Free Online Diff Checker
Compare any two files or text snippets side by side — plain text, JavaScript, TypeScript, TSX, CSS, JSON, HTML and more. Instantly see every added, removed, and changed line. Free, private, no upload.
About This Tool
Compare any two pieces of text or code side by side and instantly see every difference highlighted. Works with plain text, JavaScript, TypeScript, TSX, CSS, JSON, HTML, Markdown — anything that is text. Added lines appear in green, removed lines in red, making code reviews, config comparisons, and document change tracking effortless.
How It Works
Paste your original content in the left panel — plain text, JS, CSS, TSX, JSON, or any text format
Paste the updated or modified version in the right panel
Click Compare to instantly highlight every difference line by line
Green lines are additions, red lines are deletions — copy or share the result