Tools / Text Diff
Text Diff Checker
Paste two versions of the same text or list. Added lines turn green, deleted lines turn red, and unchanged lines stay as they are.
Lines are matched with a longest-common-subsequence diff, so inserted and deleted lines stay aligned.
When do you need a text diff?
Any time you have two versions of the same thing: a config file before and after a change, two exports of the same list, a translation against its source, or a document you edited twice.
How to use this tool
- Paste the original version on the left.
- Paste the changed version on the right.
- The comparison updates as you type — green means added, red means removed.
- Copy the unified diff to keep a record of the change.
FAQ
What does the unified diff look like?
It is the familiar patch format: lines that stay are prefixed with two spaces, added lines with + and removed lines with -. The same format is used by git diff.
Can I compare two lists of names or IDs?
Yes. Put one item per line and the diff will show which lines appeared and which disappeared — the fastest way to spot a missing entry between two exports.
Why does a small edit show as every line changing?
The comparison is line based. If a whole paragraph sits on one line, changing a word marks the entire line. Enable Ignore whitespace, or split the text into lines first.
Is there a size limit?
The diff runs in your browser, so very large files would freeze the tab. Up to 2000 lines per side is compared; beyond that the tool compares the first 2000 and tells you so.