Plagiarism & Writing
Text Difference Analyzer
Compare original and modified text side by side. See added, removed, and unchanged content highlighted with word and character difference statistics.
100% private — processed in your browser only
How to use Text Difference Analyzer
1
Enter Original text
Paste the original version of your text in the left panel.
2
Enter Modified text
Paste the revised version of your text in the right panel.
3
Click Compare
Differences are highlighted: green = added, red strikethrough = removed.
Your privacy is protected
This tool runs entirely in your browser. Files you upload are never sent to any server — they are processed locally using JavaScript and immediately discarded when you close the page.
Frequently Asked Questions
How are differences calculated?
Using a Longest Common Subsequence (LCS) algorithm on word tokens, similar to the Unix diff utility.
Is there a text size limit?
For performance, each text is limited to the first 1000 word tokens. Larger texts show a truncation notice.
What does the diff percentage mean?
The percentage of total words that differ between the two versions.