zacdaddytools
Compare two blocks of text and see additions, deletions and changed lines instantly.
Paste the original and changed text, then compare line by line.
Your text stays in your browser and is not uploaded.
A text diff checker compares two versions of text line by line so you can quickly see what was added, removed or changed. It is useful when checking edits to an article, list, document, configuration file or code snippet without reading every line twice.
Paste the earlier version into Original text and the newer version into Changed text. The side-by-side view keeps both versions aligned, while the unified view presents removals and additions in one compact list.
Choose Compare to produce a line-based result. A plus sign marks an addition, a minus sign marks a deletion, and paired rows show a changed line. Unchanged lines remain visible as context, which makes the result easier to review than a simple list of differences.
Use Ignore case when capital letters should not count as a change, such as a heading edited from “Draft” to “DRAFT”. Use Ignore whitespace when spacing, indentation or tabs should not count as a difference.
Original: colour: blue
Changed: colour: green
The comparison marks the original line as removed and the revised line as added.
Line-based comparison works naturally with source code, JSON-like configuration, release notes, checklists and prose. Long lines wrap inside the result area, while the full comparison can scroll horizontally when two side-by-side columns need more room.
This tool is designed for reviewing text, not for executing code or validating a file format. Use the JSON Formatter & Validator when you also need to check JSON syntax, and use Regex Tester when you want to test matching patterns.
Your original and changed text stay in your browser. Zacdaddy Tools does not upload the text to a server or send it to a comparison API, so you can use the tool without an account or a remote storage step.
FAQs
No. The comparison runs locally in your browser. The text is not sent to Zacdaddy Tools or an external diff service.
An addition is a line present in the changed text but not the original. A deletion is a line present in the original but not the changed text. A changed line is shown as a paired deletion and addition.
Yes. The line-based view is useful for code snippets, configuration, lists and ordinary text. It compares text only and does not execute or validate the code.
It treats differences in spaces, tabs and other whitespace within a line as unchanged. It is helpful when reviewing formatting-only edits.
The texts may be identical, or the only changes may be ignored by the selected case or whitespace option.