About Text Diff Checker
Need to spot the differences between two versions of a document, a piece of code, or a contract? Our free Text Diff Checker highlights additions, deletions, and changes between two text blocks side by side, similar to GitHub's diff view. Perfect for writers, developers, legal professionals, and anyone who needs to track changes between two versions of text.
Comparing documents manually is error-prone and time-consuming. A single word change in a legal contract can have enormous consequences. A subtle regression in code comments can confuse teammates. Our diff tool uses the Myers diff algorithm — the same algorithm used by Git — to produce accurate, line-level and word-level difference highlighting.
The tool shows additions in green, deletions in red, and unchanged text in neutral — the universal diff color convention. You can compare any text: code snippets, article drafts, legal clauses, configuration files, or translated text for accuracy. Everything runs in your browser — sensitive contract text never leaves your device.
How to Use the Text Diff Checker
Enter the original text
Paste your original (or older) text in the left panel.
Enter the modified text
Paste the revised (or newer) text in the right panel.
Click Compare
The diff highlights appear instantly — green for additions, red for deletions.
Review differences
Scroll through the highlighted output to review every change.
Key Features & Highlights
Common Use Cases
- Compare two versions of a document or article
- Check contract revisions for hidden changes
- Compare code snippets for differences
- Verify translated text against the original
- Track changes between content drafts
Frequently Asked Questions
Yes — paste any code into the text panels. The diff treats code as text, so it works for any programming language, config format, or markup.
The tool handles texts up to tens of thousands of lines in your browser. For very large files (1 MB+), processing may take a few seconds.
Yes — when two lines are similar but not identical, the tool highlights the specific words or characters that changed within the line.
Yes, 100% free with no hidden fees, subscriptions, or account requirements.
Everything runs client-side directly inside your web browser. No files, texts, or parameters are sent to our servers.
Yes, our tools are fully responsive and work seamlessly on iPhones, iPads, Android smartphones, and tablets.