Text Compare

About Text Compare

Compare two blocks of text line by line and instantly see which lines differ, with additions and removals highlighted in place. Fast and 100% private in your browser.

How to Compare Two Texts

1. Paste your original text into the Original Text (A) box and the edited version into Modified Text (B).
2. The diff updates automatically as you type — added, removed, and identical lines are counted and color-highlighted line by line.
3. Use Swap Inputs to flip A and B, or Load Sample Diff to try it with example code.
4. Click Copy Diff to copy the highlighted output, or Export Patch to download it as a text file.

Frequently Asked Questions

Does it compare by line or by character?

It compares line by line: each line in Text A is matched against the line in the same position in Text B, and any line that differs is marked as removed (A) or added (B).

Is my text uploaded anywhere?

No — all comparisons run 100% locally in your browser. Nothing you paste is sent to a server.

Why does one small edit make many lines show as different?

Because the comparison is position-based rather than realigning text, inserting or deleting a single line near the top shifts every line after it out of position, so they'll show as changed even though their content just moved down. For best results, compare texts that only have edits within existing lines rather than added or removed lines.

Can I export the diff?

Yes. Use "Copy Diff" to copy the highlighted output to your clipboard, or "Export Patch" to download it as a text file.

Limitations

This is a line-position diff, not a realigning (LCS-style) diff — it's best for spotting edits within existing lines, and less precise when lines have been inserted or deleted, since everything after that point will shift and show as changed.

Cite This Tool

Referencing this tool in a paper, article, or bibliography? Copy a ready-made citation below.

NexLove.org. (2026). Text Compare [Software]. https://nexlove.org/tools/text-compare.html

“Text Compare.” NexLove.org, 2026, nexlove.org/tools/text-compare.html.

NexLove.org (2026) Text Compare. Available at: https://nexlove.org/tools/text-compare.html (Accessed: 2026).

@misc{nexlove_text_compare,
  title = {Text Compare},
  author = {{NexLove.org}},
  year = {2026},
  url = {https://nexlove.org/tools/text-compare.html}
}

Embed This Tool

Add the live Text Compare tool to your own website with this snippet — it loads the real, working tool in an iframe, not a static screenshot.

<iframe src="https://nexlove.org/embed/text-compare.html" width="100%" height="600" style="border:1px solid #e2e8f0;border-radius:12px" title="Text Compare — NexLove.org" loading="lazy"></iframe>