Text Compare Online (Free Online Diff Checker)
Compare two texts side-by-side, then list added, removed, and matching lines. Fast, secure, and 100% free text compare tool running directly in your browser.
Text 1
Enter the first text.
Text 2
Enter the second text.
Why Compare Text Documents Online?
Checking two revisions of copy, code, or config by eye is slow. This tool compares the two boxes as whole lines: a line is added if it appears only in text 2, removed if it appears only in text 1, and unchanged if the same full line exists in both.
Click Compare to run the check in your browser with JavaScript. Text is not uploaded to a cloud server. This is not a git-style unified diff and does not highlight individual words inside a changed line.
Key Features & Benefits
Built for a simple line-set compare you can paste and review locally:
Client-Side Privacy
Comparison runs in the browser. Code, contracts, and drafts are not sent to a server.
Line Color Coding
After you click Compare, removed lines show in red, added lines in green, and matching lines in a muted color. Lists are grouped (removed, then added, then unchanged), not aligned side-by-side. Duplicate identical lines are counted once.
Simple Similarity Percentage
Similarity is matching unique lines from text 1 divided by the longer line count, then shown as a percent. It is a basic overlap score, not a high-accuracy word or character diff.
Free, No Account
Paste two texts free without a login or paid plan. There is no file upload. Very large pastes can still slow the browser.
Frequently Asked Questions (FAQ)
How does the text compare tool highlight differences between two documents?
It matches complete lines, not words. Red lists lines that appear only in text 1, green lists lines that appear only in text 2, and unchanged lines stay muted. A small edit on a line treats the old and new lines as removed and added.
Is my code or sensitive document data private during comparison?
Yes. Differences are computed in your browser with JavaScript. Text is not uploaded, stored, or processed on a remote server.
Can I compare source code, JSON files, or programming scripts?
You can paste any plain text, including code, HTML, or JSON. The tool does not parse structure or syntax—it only checks whether entire lines match exactly. Line order is not used to pair changes.