Text Diff Tool Free — Compare & Highlight

What is Text Diff?

Text Diff is a free browser-based text utility that processes your content instantly in your browser. No data is sent to a server. Works with any text you paste or type, with results appearing in real time.

This tool lets you compare two texts, highlight differences without installing any software or creating an account. Everything runs directly in your browser for maximum privacy. Your files and data never leave your device.

Use it for quick tasks at any time from any device — desktop, tablet or mobile. No subscription, no ads, no limits.

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Instant results

No server processing or wait

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100% private

Files stay on your device

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Always free

No subscription or fees

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Mobile ready

Works on any device

How to use Text Diff

Paste or type your text into the input box
Choose the transformation or analysis option you need
The result updates instantly as you make changes
Copy the output with one click

Why use OnlineToolsPlus?

Text tools on OnlineToolsPlus process all content locally in your browser — nothing is transmitted to a server. This means your private documents, legal text, client content and personal writing stay on your device. The tools handle Unicode correctly, support all languages and produce instant results for any text size.

Frequently asked questions

What does the diff tool highlight?

Additions are shown in green, deletions in red, and unchanged text in the default color. Every character or word that differs between the two versions is highlighted.

Can I compare two entire documents?

Yes. Paste any length of text into each panel. The diff works on the full content.

Can I download the diff result?

Copy the highlighted output. Direct download of the visual diff is not currently supported.

Does it handle code comparison?

Yes. The diff tool works on any text including code. It shows exactly which lines or characters changed between two versions.

What is the difference between character, word, and line diff?

Character diff shows individual letter changes. Word diff shows which words changed. Line diff shows which entire lines changed. Word or line diff is usually most readable for documents.

Does it work offline?

Yes.

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Last updated: April 11, 2026

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