Text Diff / Compare
This text diff tool compares two blocks of text line by line and highlights every difference in color — additions, removals, and unchanged lines are each marked distinctly. Paste an original and a revised version to review edits, spot accidental changes, or check a document against a previous draft. The comparison runs entirely in your browser, so neither text is ever uploaded.
Frequently asked questions
How does the text diff comparison work?
It compares the two text blocks line by line and colors each line as added, removed, or unchanged, so differences are visible at a glance.
Can I compare code, or only plain prose?
Both — the tool compares raw text line by line regardless of content, so it works for code, config files, prose, or any plain-text format.
Does the diff tool detect changes within a single line, or only whole lines?
Differences are tracked at the line level; a line with even a single changed character is marked as changed rather than partially highlighted.
Is there a size limit on the text I can compare?
There’s no fixed limit — both text blocks are compared directly in your browser, so very large inputs are limited only by your device’s performance.
Is my text uploaded when I use this diff checker?
No. Both blocks of text are compared locally in your browser and never leave your device.