Text Diff Checker
Free online text diff tool. Compare two texts side by side, instantly highlight all differences. No registration, 100% private, works offline.
How does the text diff tool work?
Our text diff tool uses advanced algorithms to compare two texts character by character or line by line. It identifies additions, deletions, and modifications, then highlights them with distinct colors - typically green for additions, red for deletions, and yellow for modifications.
Is my text data sent to a server?
No, all text comparison is performed locally in your browser using JavaScript. Your text never leaves your device, ensuring complete privacy and security. No data is transmitted to any server.
Can I compare large text files?
Yes, the tool can handle large texts efficiently. Since processing happens in your browser, performance depends on your device capabilities. For very large files (over 1MB), consider splitting them into smaller chunks for optimal performance.
What do the different colors mean?
Green indicates text that was added, red shows text that was removed, and yellow highlights modified sections. Some implementations may use orange or blue for additional distinction. The color coding helps you quickly identify what changed.
Can I compare code snippets?
Absolutely! The tool works perfectly for comparing code in any programming language. It preserves formatting and shows exact character-level differences, making it ideal for debugging, code review, and version comparison.
Does it work offline?
Yes, once the page loads, all functionality works without an internet connection. The comparison algorithms run entirely in your browser, so you can use it anywhere, even without network access.
Can I copy the comparison results?
Yes, you can easily select and copy the highlighted comparison results. The output is formatted text that can be pasted into documents, emails, or other applications while preserving the visual differences.
What text formats are supported?
The tool accepts any plain text input, including code files, configuration files, logs, CSV data, JSON, XML, markdown, and more. It works with any UTF-8 encoded text, supporting all languages and special characters.
How is this different from other diff tools?
Unlike many online tools, our solution runs 100% in your browser with no server uploads, ensuring complete privacy. It requires no registration, works offline, provides instant results, and supports all modern browsers on any device.
Can I compare documents like Word or PDF?
The tool compares plain text only. For Word or PDF files, you need to extract the text content first (copy and paste), then use the tool to compare the extracted text. This ensures compatibility and privacy.
How to Use Text Diff Checker
Compare two texts side by side and instantly highlight every difference between them. The comparison runs entirely in your browser, and your text is never uploaded.
- Paste the first version into the left box with the placeholder "Enter original text...".
- Paste the edited version into the right box that says "Enter modified text...".
- Differences are highlighted automatically as soon as both boxes contain text.
- Edit either side directly and the highlighting refreshes with every change.
- Scan the marked lines to spot additions, deletions, and reworded passages at a glance.
Copy from plain-text sources when possible — hidden formatting characters from word processors can show up as differences.
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