Is the Diff Comparer free?

Yes. It is free and open source with no login.

How does it compute the diff?

With an LCS-based algorithm that finds the optimal line-by-line differences.

No. The comparison runs entirely in your browser.

Can I see it side by side?

Yes. Both unified and side-by-side views are available.

Does it show diff stats?

Yes. It reports added, removed, and unchanged line counts.

Diff Comparer

Compare two texts and visualize the differences

Help

Original

Modified

Enter two texts and press Compare

See line-by-line differences with color-coded output

About this tool

The Diff Comparer highlights the differences between two texts line by line using an LCS algorithm. View results unified or side by side, with added lines in green and removed lines in red, plus a stats summary. It is a fast way to compare configs, snippets, or drafts without git.

How to use it

Paste both texts. Enter the original and the changed text.
Choose a view. Switch between unified and side-by-side layouts.
Read the diff. See added, removed, and unchanged lines color-coded.
Copy the output. Copy the formatted diff for sharing or notes.

Frequently asked questions

Is the Diff Comparer free?: Yes. It is free and open source with no login.
How does it compute the diff?: With an LCS-based algorithm that finds the optimal line-by-line differences.
Is my text uploaded?: No. The comparison runs entirely in your browser.
Can I see it side by side?: Yes. Both unified and side-by-side views are available.
Does it show diff stats?: Yes. It reports added, removed, and unchanged line counts.