Compare line by line
Review added, removed, and unchanged lines in their surrounding order.
Text Compare
Compare two versions of a text line by line and review their differences directly in your browser.
Compare two texts
0 / 100,000 characters
0 / 100,000 characters
Comparison result
+Added−Removed=Unchanged
Enter text on either side and select Compare to review the differences.
About this tool
Text Compare produces an exact, line-by-line comparison of two text versions. It makes additions and removals explicit without changing either input.
What Text Compare can do
Use the focused result to see how two text versions differ.
Preserve visible content
Empty lines and whitespace remain visible in the comparison result.
Copy what you need
Copy either source text or a plain-text version of the comparison result.
Get started
- Enter or paste the original text on the left.
- Enter or paste the changed text on the right.
- Select Compare.
- Review the labeled additions, removals, and unchanged lines.
Practical uses
- Compare two versions of a text.
- Review edited copy before publishing or sending it.
- Inspect changes in configuration or copied content.
- Identify missing, added, or reordered lines.
Data handling
Comparison and copying happen locally in your browser. fourwww does not receive or process the entered text on a server, and the tool does not save comparison history.
Technical scope and limitations
- Comparison is exact and case-sensitive, including whitespace.
- This version compares complete lines rather than highlighting individual changed words.
- Each input supports up to 100,000 characters and 2,000 lines to protect browser responsiveness.
- The tool compares plain text only and does not interpret document formatting, code syntax, or semantic meaning.
Frequently asked questions
Are the texts uploaded?
No. Both texts and the comparison stay in your browser and are not uploaded to fourwww.
What counts as a difference?
Any exact line difference counts, including capitalization, spaces, and punctuation.
Can I compare empty lines?
Yes. Empty lines are preserved and shown as lines in the result.
Can I compare files?
Not in this version. Paste the plain-text content into the two editors.