Welcome to the simplest and fastest way to compare two text files online. Whether you are a developer debugging code, a writer checking revisions, or simply looking to find changes in a document, our Diff Checker highlights every modification instantly.
We value your data security. All diff calculations happen locally in your browser via JavaScript. Your text inputs are never sent to or stored on our servers.
Choose between side-by-side (Split) comparison or a combined (Unified) view to visualize changes in the way that suits your workflow best.
Powered by efficient local libraries, this tool handles large text blocks without lag. Paste, click generate, and see the difference immediately.
Is this Diff Viewer free?
Yes, this tool is completely free to use for unlimited
comparisons.
Do you see my code?
No. The comparison logic runs entirely on your device. We do
not transmit your text input to any server or database.