Is this diff checker free to use?

Yes, this tool is completely free to use with no login or account required. Your text never leaves your browser.

Can I compare files online with this tool?

Yes! You can upload any text or code file and compare it against another file or pasted text. The file comparison is done entirely in your browser.

Can I install this tool offline?

Yes! This tool is a Progressive Web App (PWA). You can install it on your desktop or phone to use it offline anytime.

Free Online Text Diff Checker & File Compare Tool

Original

Modified

Free Online Text Compare & File Diff Tool — Features

The fastest and most private way to compare text, code, and files online. No login, no upload to server, no limits. Compare two texts side-by-side, find differences in documents, and spot changes in any file — all in your browser.

Instant Results

Diff computed in milliseconds entirely in your browser. No server round-trips, no latency.

100% Private

Your text never leaves your device. Everything runs client-side — completely secure.

File Upload & Compare

Drag and drop or upload any text, code, or document file to compare it online instantly.

Syntax Highlighting

Supports 15+ languages including JavaScript, Python, JSON, SQL, YAML and more.

Works Offline (PWA)

Install as an app on any device. Use it offline, anytime, without internet.

Auto-Save History

Last 30 comparisons saved automatically in your browser. Resume where you left off.

Character-Level Diff

Changed lines show exactly which characters were added or removed for maximum precision.

Side-by-Side & Inline

Switch between two powerful viewing modes to suit your workflow and screen size.

How to Compare Text Online

Paste or type your original text in the left “Original” panel.
Paste or upload your modified text in the right “Modified” panel.
Click the Compare button. Differences appear instantly highlighted in the output panel.
Toggle between Side-by-Side and Inline view, or choose a programming language for syntax highlighting.

DiffChecker.com Alternative — How We Compare

Looking for a free DiffChecker alternative that respects your privacy? Unlike diffchecker.com, our tool runs 100% in your browser — your text is never sent to any server. No account needed, no rate limits, no login walls. Just paste, compare, and go.

Feature	diffchecker.com	Notes
Free to use	~	DiffChecker.com limits free usage; advanced features require a paid plan.
No login required	~	DiffChecker.com requires an account to save diffs.
100% client-side (private)		Our tool processes everything in your browser. DiffChecker.com sends text to servers.
Works offline (PWA)		Install our tool as an app and use it with no internet connection.
File upload & compare		Both tools support file uploads.
Side-by-side diff view		Both tools provide a side-by-side comparison layout.
Inline diff view		Both tools support inline diff view.
Character-level diff		Both tools highlight individual character differences.
Syntax highlighting		Both tools offer syntax highlighting for common languages.
Auto-save history	~	Our tool saves history locally in your browser. DiffChecker.com requires an account.
No rate limits		Our tool has no comparison limits. DiffChecker.com may throttle free users.
No ads on paid plan	~	We have minimal, non-intrusive ads. DiffChecker.com has ads on the free tier.

Comparison based on publicly available information. Features may change. “~” indicates partial or plan-limited availability.

Frequently Asked Questions

How do I use this text diff checker?

Paste or type your original text in the left panel and the modified text in the right panel, then click "Compare". The tool instantly highlights all additions (green), deletions (red), and changed lines with character-level precision.

Can I compare files online for free?

Yes! This is a completely free online file comparison tool. Click the "Upload" button in either panel to load any text file (.txt, .js, .py, .json, .csv, and more). Comparison happens entirely in your browser — no server involved.

What is the difference between side-by-side and inline diff view?

Side-by-side view shows original and modified text in two columns, making it easy to see context. Inline view shows all changes in a single column with + and - markers, which is useful on smaller screens or for a compact view.

Is my text kept private and secure?

Absolutely. All text comparison and diff processing happens 100% in your browser using JavaScript. Your text is never sent to any server. This tool works fully offline too.

How does this tool save history?

Your comparisons are automatically saved to your browser's local IndexedDB storage. Only the last 30 comparisons are kept to avoid using too much disk space — old entries are automatically deleted.

Can I install this diff checker as an app?

Yes! This tool is a Progressive Web App (PWA). Click "Install" when prompted, or use your browser's install option, to add it to your desktop or mobile home screen and use it offline anytime.

What languages does syntax highlighting support?

The tool supports Plain Text, JavaScript, TypeScript, Python, JSON, HTML, CSS, SQL, YAML, XML, Java, Go, Rust, and PHP for syntax highlighting.