Compare Two Texts Online

What this tool does

Compare two texts online with a line-by-line view of unchanged, added and removed lines plus added and removed counts. You can trim leading and trailing whitespace before comparison or ignore letter case. Only the first 600 lines of each input are compared. This is not a word- or character-level diff, file or folder comparator, document parser, three-way merge tool, patch exporter or syntax-aware code comparison. Both texts stay in your browser and are never uploaded to LocalTools.

How to use it

1. Paste the original and revised text, up to the first 600 lines each.
2. Choose whether to trim line-edge whitespace or ignore letter case.
3. Review unchanged, added and removed lines and their counts.

Privacy

This tool runs entirely in your browser. Your input is never uploaded, stored or shared — closing the tab removes it.

Frequently asked questions

How do I compare two texts online?

Paste one text into each input. The tool compares them line by line and shows unchanged, added and removed lines in sequence.

What do Ignore Case and Trim Whitespace do?

Ignore Case compares letters without treating capitalization as a difference. Trim Whitespace removes leading and trailing whitespace from each line before comparison.

Is this comparison case-sensitive?

It is case-sensitive by default. Turn on Ignore Case when capitalization should not count as a change.

Can I compare files or get a word-level diff?

No. The tool accepts two pasted text blocks and compares lines only; it does not upload files, parse documents, compare folders or highlight word- or character-level changes.

Is my text sent to a server?

No. The comparison runs locally in your current browser, and LocalTools does not receive or store either text.