Text · Free online tool

Text Diff Checker

Compare original and revised text with line-by-line additions, removals, statistics, and copyable diff output.

Quick answer: Paste the original text on the left and the revised text on the right, then press Compare. Added, removed, and unchanged lines are color-coded instantly.
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How this text diff helps

This text diff checker compares two versions of text line by line and highlights exactly what changed. It is useful for reviewing edited articles, configuration files, code snippets, policy text, prompts, translations, and documentation without creating a repository or uploading confidential content. The result separates added, removed, and unchanged lines, includes change counts, and can ignore case or trim line endings when you only care about meaningful edits. A unified text output can be copied into a ticket or review comment. The diff algorithm runs locally using a small bundled library, so the content remains on your device. Clear labels, keyboard-accessible controls, mobile stacking, and local history make the tool easy to use during quick reviews. Whether you are checking a rewrite or finding an accidental deletion, the tool provides a compact alternative to a full Git client.

Last updated: . All processing happens locally; no tool input is sent to a server.

Real-world examples

Review edited copy

Compare an original paragraph with a revised version before publishing.

Audit configuration

Spot changed lines between two environment or application settings files.

Track prompt changes

Compare prompt versions and copy the unified diff into documentation.

Frequently asked questions

What does line-by-line diff mean?

Each line is compared with the corresponding sequence in the other version. The tool labels lines as added, removed, or unchanged.

Can I ignore capitalization?

Yes. Enable ignore case when capitalization changes should not count as differences.

Is this the same as Git diff?

It produces a similar line-based comparison, but it does not require a repository, commit history, or command line.

Is compared text uploaded?

No. Both versions stay in your browser and the diff is calculated locally.