Text Diff Checker

Compare two blocks of text or code and highlight every addition, deletion and change line by line. Ideal for drafts, contracts and code review.

Text Diff Checker compares two blocks of text or code line by line and highlights every addition, deletion and change, making it easy to spot what's different between two versions of a document. Paste the original in one box and the revised version in the other, and the comparison updates to show green highlights for additions and red for removals.

It handles both prose and source code, respecting whitespace and indentation so it works equally well for reviewing a contract redline, comparing two drafts of an article, or checking a code change before a commit. Because everything runs in the browser, pasted text — including confidential drafts — is never sent anywhere for the comparison to work.

How to use the Text Diff Checker

1. Paste the original version of your text into the first input box.
2. Paste the revised or updated version into the second input box.
3. Review the highlighted differences, with additions shown in green and deletions shown in red.
4. Scroll through unchanged lines shown in neutral colour to see the full context around each change.
5. Copy either version or export the comparison if you need to share the result.

Why use this tool

Line-by-line highlighting

Additions and deletions are colour-coded directly inline, so even a single-word change in a long paragraph is immediately visible without manually re-reading both versions.

Works for code and prose

Whitespace and indentation are preserved and compared, which makes the tool equally useful for reviewing a code diff before committing changes as it is for comparing two drafts of a document.

Nothing leaves your browser

Both text inputs are compared locally, so contracts, drafts or proprietary code being reviewed are never transmitted to a server during the comparison.

Common use cases

• Comparing two versions of a contract to spot every clause that was added or removed during negotiation.
• Reviewing an editor's changes to an article draft before approving the final copy.
• Checking a code snippet against a previous version to understand exactly what changed.
• Comparing two exported configuration files to track down what setting was altered.
• Verifying that a translated document's structure matches the original paragraph for paragraph.

How changes are displayed

Added content appears highlighted in green, removed content in red, and lines that are identical in both versions stay in neutral colour. This three-way colour coding makes it possible to scan a long document quickly and jump straight to the lines that actually changed.

Comparing source code

Because the diff respects exact whitespace and indentation, it is suitable for reviewing code changes where a shifted indent level or an extra space is meaningful. This makes it a lightweight alternative to a full version control diff view for a quick one-off comparison.

Tips for large documents

For very long documents, it helps to compare section by section rather than pasting an entire book-length file at once, since it is easier to review a manageable block of highlighted differences than to scroll through hundreds of lines. Removing unrelated boilerplate before comparing also reduces visual noise in the results.

Frequently asked questions

Does the diff work for source code?

Yes. Whitespace and indentation are respected, so it works well for reviewing code changes as well as prose.

How are changes displayed?

Added content is highlighted in green, removed content in red and unchanged lines stay neutral, which makes even small edits easy to spot.

Is Text Diff Checker free to use?

Yes. Text Diff Checker on Klipza is completely free with no account, no subscription and no watermark on your files, and there is no daily usage limit.

Are my files safe when using Text Diff Checker?

Processing happens locally in your browser wherever technically possible, so your files are not uploaded to a server, stored or shared with third parties.

Does Text Diff Checker work on mobile phones?

Yes. It is fully responsive and runs in any modern browser on Android, iPhone, iPad, Windows and macOS — nothing to install.