Text Compare & Diff Tool

Compare text, code, and files side-by-side with our free online Diff Checker. Secure, private, and AI-powered.

Securely Processed
Auto-Deleted
Privacy Protected
Original Content

Paste text or drop a file to begin

Changed Content

Paste text or drop a file to begin

Privacy First

Your data never leaves your browser. All comparisons are performed locally for maximum security.

High Precision

Our algorithm accurately identifies line changes even in heavily shuffled files.

Smart Detect

Automatically detects moved blocks of code or text to minimize noise in diffs.

How to Use Text Compare

1

Enter Content

Paste your original text in the left panel and the modified version in the right panel.

2

Adjust Settings

Use the sidebar to toggle real-time comparison, unified view, or ignore case/whitespace.

3

Review Changes

Differences are highlighted instantly. Use the navigation buttons to jump between changes.

Why Use Text Compare?

High-Precision Engine

Our Patience Diff algorithm accurately identifies line changes even in heavily shuffled files.

Privacy First

Your data never leaves your browser. All comparisons are performed locally for maximum security.

Smart Move Detection

Detected moved blocks automatically, even if they've been slightly modified during the move.

Multiple Formats

Compare plain text, code snippets, JSON, XML, or any other text-based format with ease.

Common Use Cases

Code Review

Compare two versions of a code snippet to identify bug fixes, feature additions, or regressions.

Config Checking

Spot subtle differences between configuration files (e.g., JSON, YAML) across different environments.

Document Editing

Track changes in drafts, articles, or legal documents to ensure no unauthorized edits were made.

List Comparison

Compare two lists of items (e.g., emails, inventory) to find missing or added entries quickly.

Frequently Asked Questions

Is my data secure?

Yes. This tool is built with a "Privacy-First" approach. All processing happens locally in your browser; no text is sent to our servers.

What is "Patience Diff"?

Patience Diff is an advanced algorithm that focuses on matching unique lines first, providing much cleaner results for code and long documents than standard algorithms.

Can I ignore whitespace?

Yes, you can toggle "Ignore Whitespace" in the settings to focus only on meaningful text changes.

Does it support large files?

Yes, the tool is optimized for performance and can handle large text blocks efficiently within your browser's memory limits.

More questions?

Visit our FAQ page

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About Our Online Text Compare & Diff Tool

Why Use a Text Comparison Tool?

Comparing two text files manually is tedious and error-prone. Our free online text compare tool automates this process, highlighting every difference, addition, and deletion with character-level precision. Whether you are a developer checking code diffs, a writer editing drafts, or a student reviewing essays, our tool ensures you never miss a change.

Key Features of FileFusion Diff Checker

Side-by-Side & Unified Views

Switch seamlessly between split view (two columns) and unified view (combined) to visualize changes in the way that suits your workflow best.

AI-Powered Summaries

Don't just see the changes—understand them. Our AI Text Analysis summarizes the impact of edits, helping you grasp the "big picture" instantly.

100% Private & Secure

Your data never leaves your browser. Unlike other tools that upload files to a server, FileFusion processes everything locally on your device for maximum privacy.

Smart Sort & Trim Toggles

Clean up messy data before comparing. Use our smart toggles to Sort Lines, Trim Whitespace, and Remove Empty Lines to focus only on meaningful differences.

How to Compare Two Text Files Online

  1. Paste or Upload: Enter your original text in the left panel and the modified text in the right panel.
  2. Auto-Compare: The tool instantly highlights differences in Red (Deletions) and Green (Additions).
  3. Analyze: Use the "Diff Navigator" to jump between changes or the "Stats" view to see the match percentage.
  4. Export: Download the comparison report or copy the merged text for your records.

Supported Formats

Our diff checker supports plain text, code snippets (JSON, XML, JavaScript, Python, HTML, CSS), and log files. It is optimized for large blocks of text and maintains syntax highlighting for better readability.