Text Diff Checker
Compare two texts and instantly highlight every addition, deletion, and change - line by line, word by word, or character by character.
Orig
Original text
0 chars · 0 words · 0 lines
New
Modified text
0 chars · 0 words · 0 lines
How to use
- Paste the original text into the left panel.
- Paste the new or edited version into the right panel.
- Choose whether to compare by line, by word, or by character.
- Review the colored highlights: green for additions, red for removals, yellow for changes.
- Toggle case sensitivity or whitespace handling for cleaner diffs.
Frequently asked questions
How does the diff algorithm work?
Under the hood we use a longest-common-subsequence comparison, the same family of algorithms behind Git diffs. It produces minimal, readable changesets for most natural text.
Can I compare large files?
Yes. The tool comfortably handles tens of thousands of lines on a modern device. Very large files may slow rendering since highlights are rebuilt on each change.
Is my text uploaded anywhere?
No. The diff runs entirely client-side so neither input ever leaves your browser.
Can I ignore whitespace or case differences?
Yes. The Options panel includes toggles to ignore leading and trailing whitespace, collapse runs of spaces, and treat upper and lowercase as equivalent.
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