Text diff checker

How the text diff checker works

Paste your original text in the left panel and your revised text in the right panel. The tool compares them instantly and highlights every change. Additions appear in green and deletions in red. Switch between line, word, and character comparison to get the granularity you need. You can also toggle side-by-side view, ignore case differences, or ignore whitespace changes.

How to use this diff checker

1. Paste the original text in the left panel.
2. Paste the revised text in the right panel.
3. Pick a mode: line for documents, word for proofreading, character for code.
4. Read the highlights — green is added, red is removed.

Worked example

A legal team receives v2 of a contract and needs to confirm exactly what changed from v1. They paste v1 on the left, v2 on the right, switch to word mode, and instantly see that the payment terms clause was rewritten and a termination paragraph was added — without reading all 14 pages line by line. Because the comparison runs in the browser, the contract terms never leave the device.

Frequently asked questions

How does the text diff checker work?

Paste your original text in the left panel and the changed text in the right panel. The tool instantly compares them and highlights additions in green and deletions in red. You can switch between line, word, and character comparison modes.

Is my text uploaded to a server?

No. All comparison runs entirely in your browser. Your text is never sent to any server. This makes it safe for comparing sensitive, confidential, or proprietary documents.

What diff modes are available?

Three modes: Line diff (best for documents and paragraphs), Word diff (best for editing and proofreading), and Character diff (best for code and precise changes). You can also toggle side-by-side or inline view.

Can I compare code with this tool?

Yes. While this tool works for any text, we also offer a dedicated Code Diff Tool with monospace formatting and code-specific sample text.