Text Diff Checker

Compare two versions of text and instantly see what changed, line by line.

Original text

Modified text

How to Use This Tool

Paste the original and modified text side by side, then compare. Added lines show in green, removed lines in red, unchanged in grey.

The comparison is line-based, ideal for configs, code and prose revisions.
For precise character-level differences, pair this with a more advanced diff tool.

Frequently Asked Questions

What does the coloring mean?

Green lines are additions, red lines are deletions, and plain lines are unchanged. Grey matches let you see the surrounding context.

Is this the same as a git diff?

It works on the same principle, but this tool handles plain text you paste, not files or commits.

Can it handle big files?

Yes, for reasonable sizes. Very large inputs may slow down the alignment step.

Is my text shared?

No — everything runs locally in your browser.

Practical Example

Put Hello world in the Original box and Hello there in the Modified box, then Compare. The result shows one removed line (Hello world) and one added line (Hello there).

The summary reads 1 added, 1 removed, 0 unchanged.
If both texts are identical, every line is marked unchanged and the added/removed counts are zero.
Line order matters — the tool matches the longest common run of identical lines.

What Your Results Mean

Added — lines present in the modified text but missing from the original, shown with a + marker.
Removed — lines present in the original but missing from the modified text, shown with a − marker.
Unchanged — lines identical in both texts, kept as context to show where changes happen.