Diff Checker — Free Online
Compare two texts line by line. Works in your browser, no install needed.
Free with a CeevTech Tools account — no credit card required.
How to use Diff Checker
Paste the first version into Original.
Paste the new version into Changed.
Click Compare to see the line-by-line differences.
Why use CeevTech Diff Checker?
Spotting what changed between two versions of a config file, contract clause or code snippet by eye is slow and error-prone. CeevTech Diff Checker compares two texts line by line and marks removed lines with a minus and added lines with a plus, with unchanged lines in between. Paste the original and changed versions to compare text online.
- Fast: processes your code or data in seconds.
- Private: runs in your browser, so nothing is uploaded.
- Works everywhere: desktop, tablet and phone, in any modern browser.
- One account, 79+ tools: PDF, image, office, AI, developer and business tools in one place.
Frequently asked questions
Does it highlight changes within a line?
No. It compares whole lines. A line that changed shows as the old line removed and the new line added.
Is there a size limit?
Yes. Each side is compared up to its first 2,000 lines.
Is Diff Checker free?
Free with a CeevTech Tools account — no credit card required.
Do I need to install anything?
No. Diff Checker runs online in your browser on Windows, Mac, Linux, Android and iPhone.
Is my data private?
Yes. Diff Checker runs entirely in your browser, so your data never leaves your device.