Free Online Text Diff Checker and Compare Tool
Comparing two text versions to find changes is common in writing, coding, and data work. Our free diff checker highlights additions, deletions, and modifications using Google's diff-match-patch library. Additions appear in green, deletions in red. Upload .txt files directly or paste text, then use the swap button to quickly reverse the comparison direction. A stats summary shows total changes, additions, and deletions at a glance.
Use Cases
Content editing (compare drafts with edits), code review, contract and legal review, data validation (compare API responses or configs), and SEO monitoring (track competitor content changes). Upload files for quick comparison or paste text when working with snippets.
Frequently Asked Questions
How does the diff algorithm work?
Google's diff-match-patch uses the Myers diff algorithm to find the minimum edit distance between two texts. It groups adjacent changes for readability.
Can I upload files instead of pasting?
Yes. Each text input has an "Upload .txt" button that loads a file from your device. You can also swap Text A and Text B with one click.
Is there a size limit?
Texts up to 500,000 characters each work well. For very large files, use command-line tools like diff.
Can I download the diff results?
Copy the diff summary to your clipboard. For sharing, you can save the output as HTML to preserve color coding.