Diff Checker

Compare two texts side by side and highlight additions, deletions, and changes. Ideal for code reviews, document versioning, and proofreading.

Files never leave your device Always free No server uploads No sign-up No watermarks

Processing happens on your device — nothing is uploaded.

How It Works

Paste original and modified text

Enter the original version in the left pane and the new version in the right pane.

Diff highlights instantly

Added, removed, and changed lines are highlighted in green, red, and yellow respectively.

Copy or export the diff

Copy the diff result or use the output in your workflow. All comparison is done locally.

Frequently Asked Questions

What is Diff Checker?

Diff Checker is a free, browser-based tool on TitanFile that lets you compare two texts side by side and highlight additions, deletions, and changes. Ideal for code reviews, document versioning, and proofreading. Everything runs locally on your device — no files are ever uploaded to any server.

How do I use Diff Checker?

Open the Diff Checker page, add your file or enter your data, adjust any settings, then click the action button. Your result is ready instantly — no sign-up or installation required.

Are my files private?

Yes — all processing happens entirely in your browser using JavaScript. Your files and data never leave your device and are never uploaded to any server. We cannot see your files even if we wanted to.

Does this work offline?

Once the page has loaded, Diff Checker works without an internet connection. You can install it as a PWA to your home screen for instant offline access.

Is there a file size limit?

There is no server-side limit because everything runs locally in your browser. The practical limit is your device's available memory. Most modern devices handle files up to several hundred MB without issue.

Why is this free?

TitanFile is ad-supported and passion-driven. We believe powerful tools should be accessible to everyone. Diff Checker — like every tool on TitanFile — will always be free with no paywalls, watermarks, or hidden fees.