Text Diff Checker

Compare two pieces of text and find the differences.

Original Text

Modified Text

Result

Enter text in both fields to see the differences.

How to use

Paste the original version into the left field and the edited version into the right field. The comparison updates as you type — no button to click. Lines that were removed from the original are marked in red, lines added in the new version are marked in green, and unchanged lines are shown without any marking.

Paste the original text into the 'Original Text' field.
Paste the changed or updated version into the 'Modified Text' field.
Review the result panel — added and removed lines are marked separately.
Use the added/removed counts above the result to gauge the size of the change at a glance.

AdSense Placeholder

About Text Diff Checker

Text Diff Checker compares two blocks of text line by line and shows you exactly what changed between them. Added lines and removed lines are marked separately, so instead of re-reading both versions side by side to spot what's different, you can see it at a glance.

Common Use Cases

Reviewing an edited draft before accepting the changes.
Comparing two versions of a config file to spot what changed between deployments.
Checking whether a copy-pasted block of text was altered in transit.
Spotting accidental changes when merging text from two sources by hand.

Tips

The comparison is line-based, so a single word change on a long line will mark the whole line as changed — for word-level precision, look at where the changed line differs, not just that it changed.

If you're comparing code, formatting-only differences (like indentation) will still register as changes, since the tool compares text, not syntax.

Frequently Asked Questions

Does this tool send my text anywhere to compare it?

No. The comparison runs in your browser using JavaScript — neither text ever leaves your machine.

Can it compare code files, not just plain text?

Yes, it works on any plain text, including code — though it compares text content, not code structure, so a functionally identical change written differently will still show as a difference.