Line-based comparison
A changed line appears as one removal and one addition, making the exact before-and-after content visible.
Text Tools · Local processing
Text Compare
Compare two blocks of text and highlight added, removed, and unchanged lines privately.
Compare locally
Find differences between two texts
The practical guide
Review line-level changes without a heavyweight editor.
The comparison uses a longest-common-subsequence diff and offers inline or side-by-side views.
Designed for practical text
A safety limit prevents extremely large comparisons from exhausting browser memory.
Privacy by architecture
Your files and tool inputs stay in your browser.
The selected files, inputs, settings, and outputs are processed in this page and are not uploaded to any server.
Questions, answered
Frequently asked questions
Is compared text uploaded?
No. Both inputs and the generated diff remain in this browser.
What does a changed line mean?
The tool reports the old line as removed and the new line as added.
Can I compare code?
Yes. The comparison preserves line content, although it does not provide language-specific syntax highlighting.