Text Diff Checker Details
Text Diff Checker compares two texts line by line and lists only the lines that differ, old above new.
Use it to spot what changed between two versions, find where a copied config diverged, or see which sentences an edit touched.
The workflow
Short version: give it input, run it, take the output. Details below.
- Paste the first text into the top box.
- Paste the second text into the box that appears below it.
- Run the tool; differing lines are listed with their numbers.
Formats, limits and behaviour
How the comparison works:
- Comparison is line based: lines at the same position are matched.
- Each difference prints the old line, then the new one, with the line number.
- If one text is longer, the extra lines are reported as differences too.
- When nothing differs, the output says so plainly.
Picking the right tool
For a quick line-level comparison this page is enough. When comparing code, running both sides through the matching formatter first (JSON, CSS, JS) gives a much cleaner result.
There is no word or character level diff: change one letter and the whole line counts as different. Alignment does not shift for inserted or removed lines, so adding a line makes everything after it look changed.
Quick tips
- If a line was inserted, split both texts at the same point and compare in chunks.
- Format both sides with the same formatter before comparing to remove noise.
- Trim trailing spaces first to catch invisible whitespace differences.
Privacy and data handling
This tool runs entirely in your browser, so what you type is not sent to the server. The only request that leaves is a counter with no content in it. Third-party advertising cookies may be present on the page, and they cannot read your input.