Text Diff Online — Compare Text Line by Line
Compare two text blocks online and identify changed lines locally in your browser.
About this tool
This simple text diff compares corresponding lines by position. Unchanged lines receive a neutral marker, while different or missing lines are shown as removed and added text.
How to use
- Paste the original text in the first field.
- Paste the comparison text in the second field.
- Run the diff and inspect removed and added lines.
Features
- Compares text line by line.
- Marks removed and added line values.
- Keeps both inputs local.
Common use cases
- Compare configuration snippets.
- Review changes between two lists.
- Spot altered lines in logs or drafts.
Common issues and tips
- Inserted lines shift later comparisons because this is positional, not a full sequence diff.
- Differences in whitespace and capitalization count as changes.
Privacy
Text comparison runs locally in your browser. Neither input is uploaded to Tools12345.
Frequently asked questions
What do plus and minus lines mean?
A minus line is from the first input; a plus line is the value at the same position in the second input.
Does it ignore whitespace?
No. Each line is compared exactly.
Can I compare sensitive configuration?
Processing is local, but remove secrets before sharing the resulting diff.