How does the diff work?

The tool compares text line by line and highlights added, removed, and unchanged lines — similar to how git diff works.

Yes. The tool works with any text including source code, configuration files, JSON, and plain text.

Is my text sent to a server?

No. All comparison happens in your browser.

Currently you paste text into both fields. Copy the file contents and paste them in.

Diff Checker

Compare two blocks of text side by side and highlight the differences. Free online diff tool.

Original

Modified

Frequently asked questions

Diff Checker — Compare Two Texts Online Free

Paste two blocks of text and instantly see what's different. Lines that were added, removed, or changed are highlighted in color. Great for comparing code versions, config files, or any two pieces of text.

Line-by-line comparison

See exactly which lines differ between the two texts.

Color-coded output

Added lines in green, removed in red, unchanged in neutral.

Private

Runs entirely in your browser. Nothing is uploaded.