How to use it
- Paste the original version in the first box and the changed version in the second.
- Choose Line or Word as the comparison unit.
- Press Compare. The merged result appears below with a count of additions and removals. Swap exchanges the two texts and compares again.
Reading the result
The result is a single merged text. Parts with a green background were added in the changed version; parts in red strike-through existed in the original but were removed. Everything without a mark is identical in both. When a phrase is reworded, you will usually see the old wording struck through in red immediately followed by the new wording in green, so each edit reads as "this became that".
Line mode vs. word mode
| Mode | How it compares | Best for |
|---|---|---|
| Line | Each line is one unit; a line that differs by a single character is marked as removed and added | Code, config files, lists, numbered clauses |
| Word | Each word, number and punctuation mark is compared separately | Essays, articles, cover letters, long paragraphs |
Ignore case treats "Apple" and "apple" as the same word. Ignore leading/trailing spaces is on by default and stops indentation or stray spaces at the end of a line from showing up as changes. Spaces in the middle of a line are still compared, because a missing or extra space between words is a real edit.
Common uses
- Essay and paper revisions — compare your draft with the version your tutor or editor returned and review every change instead of accepting it blindly.
- Contract and terms changes — check whether a counterparty quietly changed an amount, a date or a liability clause between two drafts. Treat it as a reading aid, not legal advice.
- Code and config files — spot the changed lines between two copies of a settings file or a snippet when you do not have a version control tool at hand.
- Checking your own rewording — when you paraphrase a source, compare it with the original to see how much of the wording you really changed. This is a self-check only; it does not detect plagiarism.
Privacy and limits
Everything is calculated locally in your browser; nothing is uploaded. Very long texts in word mode may exceed the size limit, in which case the tool asks you to use line mode or split the text. Text copied from PDFs often contains extra spaces and line breaks that create noisy differences, so run both versions through Remove Extra Spaces first. To apply the same correction across a document, try Find and Replace.