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File Compare

Identify differences between two text files or code snippets instantly. Perfect for code reviews, document comparison, and version control analysis.

Files processed locally - No server uploads

Best for: Checking code changes before commit, comparing config files, and spotting plagiarism.

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Desktop: 25MB Limit

Supported Formats:

Text.txt, .log, .md, .csv, .xml
Code.js, .ts, .tsx, .jsx, .py, .java, .c, .cpp, .h, .cs, .go, .rs...
Config.env, .ini, .conf, .config, .properties, .toml
Original (A)
Modified (B)
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1How to Compare

  1. Paste or upload your first file or text snippet
  2. Paste or upload your second file or text snippet
  3. Click "Compare" to analyze the differences
  4. Review the highlighted differences in the side-by-side view
  5. Export or copy the comparison results if needed

★Features

  • Side-by-side file comparison
  • Line-by-line difference highlighting
  • Support for various file formats
  • Character-level and word-level diff
  • Privacy-focused - local processing

Understanding Diff Algorithms

At the core of every file comparison tool is a "diff" algorithm. The most common one, popularized by the Unix `diff` utility, determines the smallest set of deletions and insertions needed to transform one text into another.

Common Use Cases

  • Software Development: Tracking changes in source code (Git uses similar logic).
  • Legal Documents: Initializing contract redlines and revision history.
  • Content Management: Identifying updates in blog posts or wiki entries.

"The power of a diff tool lies not just in finding what changed, but in filtering out the noise of what stayed the same."

🔒Privacy & Security

Comparing sensitive configuration files or proprietary code on a public server is a security risk.

**UtilBelt File Compare solves this.** We do not have a backend server for this tool. When you paste your data, the comparison logic runs 100% inside your browser's JavaScript engine. Your code, keys, and data never leave your computer.

📄Supported Formats

  • ✔ Plain Text (.txt)
  • ✔ JavaScript / Typescript
  • ✔ Python / Ruby / PHP
  • ✔ JSON / YAML / XML
  • ✔ HTML / CSS
  • ✔ C / C++ / C# / Java
  • ✔ Markdown
  • ✔ SQL Queries

Related Utilities

Password Generator|Cron Expression Generator|Word Counter

Use Cases

Code review and version comparison
Document revision tracking
Configuration file comparison
Data file validation
Merge conflict resolution
Plagiarism checking

Frequently Asked Questions

What file types are supported?

Our file compare tool works with any text-based file format including plain text, code files (JavaScript, Python, Java, etc.), JSON, XML, CSV, and more. Binary files are not supported.

Is my data secure?

Yes, all file comparison happens entirely in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

Can I compare large files?

Yes, our tool can handle large text files. However, very large files (over 10MB) may take longer to process. All processing happens in your browser, so performance depends on your device's capabilities.

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