What does this tool do?
| Direct answer | Text Compare computes a line-level diff (LCS) showing added (+) and removed (−) lines. |
| Key fact | The diff uses the longest-common-subsequence algorithm — same approach as classic diff. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Paste the original text on the left.
- Paste the changed text on the right.
- Click Compare texts.
Example
Input
the quick brown fox
Output
- the quick brown fox + the quick red fox
Who is this for?
This tool was built for people who need a fast answer in the browser — no install, no account, no data leaving the device.
Writers cleaning up drafts, developers batch-fixing text, translators, and students. Paste, transform, copy — no signup, no limits.
Frequently asked questions
Is comparison word-level or line-level?
Line-level; changed lines appear as a −/+ pair.
Does order matter?
Yes — lines are compared in order.
Any size limit?
Very large inputs (10k+ lines) may slow down; the LCS table grows quadratically.