Text Compare (Diff Checker)
Compare two versions of a text line by line and see exactly what was added, removed or changed.
Result
How to use
- 1
Paste the original text on the left and the new version on the right.
- 2
The summary shows how many lines were added, removed and unchanged.
- 3
Scroll down to see every change highlighted — changed words are marked inside each line.
Questions
How does the comparison work?
It finds the longest common sequence of lines between the two texts (the same idea used by programmers’ diff tools). Lines that are not part of it are shown as removed (red) or added (green).
Why is a changed line shown as removed and added?
A diff works line by line, so an edited line appears as the old line removed and the new line added. The exact words that changed are highlighted inside them.
Is there a size limit?
It handles a few thousand lines comfortably. Everything runs in your browser, so nothing is uploaded.
About this Text Compare tool
Text Compare (Diff Checker) — Compare two versions of a text line by line and see exactly what was added, removed or changed. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Paste the original text on the left and the new version on the right.
Related reading
Articles that go with this tool
How Social Media Algorithms Decide What You See (Explained Simply)
Why does your feed show cooking reels one week and cricket clips the next? A simple explanation of how social media algorithms work, and how you can take back some control.
Personal Branding for Professionals: Be Known for Something Real
Personal branding is not about showing off. It is about being known for what you are genuinely good at. A simple, honest guide for working professionals in India.
Social Media and Mental Health: Setting Healthy Limits Without Quitting
Why do we keep scrolling even when it makes us feel worse? The simple psychology behind likes and doomscrolling, and practical limits that help you enjoy social media without losing peace.
Related tools
More text tools you may like
Results are estimates to help you plan. They are not financial, tax or medical advice.