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Diff Guru – Text, Code Compare & Merge Tool
The fastest way to compare text, code, or files, spot differences and merge changes online.
Diff Guru is a secure, privacy-focused diff checker trusted by professionals. Stop checking for differences manually - visualize every change instantly. Best of all, you can merge unlimited changes and copy your clean text for free. No sign-ups, no caps, just accurate results.
About Diff Guru - Compare & Merge Text Online
Diff Guru is designed to help you compare two text files, code snippets, or documents with complete accuracy. Whether you are a developer reviewing code changes, a writer comparing drafts, or a student checking assignments, this tool visualizes every difference and helps you merge changes in a clean, easy-to-understand way.
Below is a detailed explanation of how Diff Guru works behind the scenes and how you can use it to get the best results.
How Diff Guru Works (Step-by-Step)
1
Paste or upload your original text
This is the version you want to compare from.
2
Paste or upload your changed text
This is the updated or modified version.
3
Click “Find Differences Instantly”
Diff Guru processes both versions in real time.
4
See highlighted differences
Additions, deletions, and modifications are color-coded and organized line by line.
5
Review, edit, or export
You can copy the results, analyze the changes, or continue editing your files.
The entire comparison process happens instantly, directly in your browser, ensuring speed and privacy.
Supported Formats & Languages
Diff Guru supports a vast array of formats. Select a specific tool below for optimized syntax highlighting and comparison.
Programming
Data & Config
Why Choose Diff Guru?
Free Online Diff Checker
Instant comparison of text and documents-no cost to use.
Clear Change Highlighting
Additions and deletions are visually emphasized, with support for line numbers and easy merging.
Privacy-First Design
No signup, no personal data collection-input is processed in real time and not stored.
Simple & Fast Interface
No distractions, just open two inputs and compare-ideal for casual users and professionals alike.
Unlimited Merge Options
Merge changes between your documents as many times as you need, with no restrictions.
Transparent Terms
Clear policies stating “as-is” availability, privacy guarantees, and disclaimers about user responsibility.
Loved by Professionals Worldwide
"Diff Guru has become an indispensable tool for our team's code reviews. It's fast, accurate, and incredibly easy to use."
- Alex R., Lead Developer
"As a writer, I constantly need to compare document drafts. Diff Guru saves me hours of manual checking. A real lifesaver!"
- Sarah L., Content Strategist
Frequently Asked Questions
Yes, absolutely. Diff Guru is a free online tool. There are no hidden costs, usage limits, or premium features. Our goal is to provide a powerful and accessible utility for everyone.
Your privacy is our top priority. All text comparisons are performed directly in your web browser. The data you paste is never sent to our servers, stored, or logged. What you compare stays on your computer.
No. Diff Guru is a hassle-free web application. There's no need to create an account, register, or install any software or browser extensions. Just open the website and start comparing.
You can compare any plain text content. This makes it ideal for source code (like JavaScript, Python, HTML, CSS), configuration files (JSON, XML), documents, articles, and any other text-based files.
When a difference is found, you will see options to merge the change from left to right, or right to left. Clicking a merge button replaces the content in one document with the content from the other for that specific change block, allowing you to selectively combine your texts.
While there are no hard limits, performance may degrade with extremely large text inputs (e.g., millions of lines) as all processing is done in your browser. For most practical use cases, you won't encounter any issues. You can use the tool as often as you like.
We'd love to hear from you! You can contact us with any feedback, bug reports, or feature suggestions via the email address provided on our 'About Us' page. Your input helps us make Diff Guru better.
We focus on three key things: speed, simplicity, and privacy. Our tool is designed to be incredibly fast and intuitive, with a clean interface that gets out of your way. Our strict client-side-only processing guarantees the privacy of your data, which is a promise not all online tools can make.