Check Difference Between Two Text & Code Files
Our free, secure online diff tool helps you instantly see the difference between two text files, documents, or code.
Paste your text above and click "Compare" to see the results.
Our free, secure online diff tool helps you instantly see the difference between two text files, documents, or code.
Paste your text above and click "Compare" to see the results.
Ever asked "What changed in this document?" Our free, secure tool is the answer. It's designed to let you instantly **check difference between two text** blocks, whether it's a simple paragraph, a legal document, or complex source code. Paste your "Original" and "Changed" versions, click "Compare," and see every addition and deletion highlighted in seconds.
We've made the process incredibly simple. You don't need to be a developer to use our diff tool.
This tool is more than just a simple comparison. It's the foundation for a professional-grade diff utility, built with the features you need. All our tools are 100% client-side, meaning your data is always secure.
Our tool lets you choose *how* you want to **check difference between two text** inputs. **Word-level diff** (the default) is perfect for articles and essays. **Character-level diff** is for precision, letting you see single-character typos or changes in code. We are also working on a **Sentence-level diff** for high-level document review.
One of the most requested features is the ability to ignore "noise." When you **check difference between two text** files, you often don't care about a simple capitalization change or an extra space. Our "Ignore Rules" let you filter out these changes, so you can focus only on what matters.
Soon, this tool will become a full-fledged **code compare online** utility. It will understand HTML, CSS, JavaScript, Python, and JSON. This "Syntax Aware Diff" will correctly highlight changes within code, ignoring meaningless whitespace changes inside a string, and properly formatting the output.
After you **check difference between two text** blocks, what's next? Our upcoming "Merge Tool" will allow you to go through each change one-by-one and choose whether to accept or reject it, letting you build a final, "merged" version of your document right in your browser.
Why compare one file at a time? We are building a **bulk file compare tool** that uses modern browser APIs to let you drop two *folders* and see a list of which files have been changed, added, or deleted. This is a "pro" feature, and it will be 100% client-side and secure.
Need to share your findings? You'll be able to **export your diff report** as a clean HTML file or a printable PDF document to share with your team or keep for your records.
What if your text is in an image? Our future **OCR diff checker** will use client-side Tesseract.js. You'll be able to upload two screenshots or scanned documents, our tool will extract the text, and then it will **check difference between two text** contents automatically.
To check difference between two text files, paste your original text into the 'Original' box and the new text into the 'Changed' box. Click the 'Compare' button to see all additions (in green) and deletions (in red) highlighted.
Yes, this tool is 100% secure. All comparisons happen inside your web browser (client-side) using a JavaScript library. Your text is never sent to our server, so your sensitive data, code, or documents remain completely private.
Yes. Before you click 'Compare', you can check the 'Ignore Whitespace' or 'Ignore Case' boxes. This allows you to check difference between two text files while ignoring trivial changes in formatting or capitalization.
A "diff tool" (from the word "difference") is a program that compares two files or blocks of text and shows you exactly what has changed between them. It is used by developers, writers, and editors to track revisions and merge changes.