Need to compare two versions of a text and see what has changed? This tool highlights the differences between two blocks of text, showing which lines have been added, removed, or modified. It's useful for comparing document revisions, checking code changes, reviewing updated content, or spotting differences between two versions of a file. Results update live as you type, making it easy to identify changes without manually scanning both versions.

Simply paste your original text and the revised version to see the differences highlighted instantly. Everything is processed directly in your browser, with nothing sent to a server, keeping your text private and under your control.

How to use it

The diff checker compares two blocks of text line by line.

1. Paste your textPut the original version on the left and the changed version on the right.
2. Read the resultRemoved lines are highlighted in red, added lines in green.
3. Adjust the optionsIgnore whitespace or case differences if they're not meaningful for your comparison.
4. Check the summaryThe stats line shows how many lines were added, removed and unchanged.

Good to know

Nothing is uploaded

Comparison happens entirely in your browser.

Line-by-line

This tool compares whole lines, not individual characters within a line.

Order matters

A moved block of text shows up as a removal in one place and an addition in another.

Frequently asked questions

What do the colors mean?

Red lines, marked with −, only appear in the Original text. Green lines, marked with +, only appear in the Changed text. Lines with no highlight are identical in both.

Does this compare whole files or just text?

Just text — paste the contents of two files, two versions of a paragraph, or any other text you want to compare.

Why does one small change show as a whole line removed and added?

This tool compares entire lines rather than individual words or characters, so changing even one character inside a line shows that line as removed from the original and added in the changed version.

Is my text uploaded anywhere?

No. The comparison runs locally in your browser.

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