Text Diff Checker
Paste two versions of your text below to see exactly what changed between them.
How to Use
- Paste the original text in the left panel.
- Paste the modified text in the right panel.
- Click "Compare" to see the differences highlighted.
- Removed lines appear in red, added lines in green.
Features
- Line-by-line text comparison
- Color-coded additions (green) and removals (red)
- Side-by-side input for easy pasting
- Works entirely in your browser - no data sent to servers
- Perfect for comparing code, essays, or document versions
Why Use a Text Diff Checker
Comparing two versions of a document by reading them line by line is slow and unreliable, especially when the changes are subtle. A misplaced comma, a reworded sentence, or a deleted paragraph can easily slip past even the most careful human eye. A text diff checker automates this process by scanning both versions and highlighting every addition, removal, and modification so you can see exactly what changed at a glance.
Developers rely on diff tools every day to review code changes before committing them to version control. Editors use them to compare drafts of articles, contracts, or legal documents to ensure no unauthorized changes were made. Students can compare their essay revisions to track their editing progress. If you have ever received feedback on a document and wondered what the reviewer actually changed, a diff tool gives you the answer in seconds.
This tool runs entirely in your browser, so your text is never uploaded to a server. That makes it safe for comparing sensitive content such as contracts, proprietary code, or personal writing. The color-coded output, with red for removed lines and green for added lines, follows the same convention used by Git and other professional diff tools, making it instantly familiar to developers and technical writers.
Frequently Asked Questions
Does the diff checker compare by words or by lines?
The comparison is performed line by line. Each line in the original text is compared against the corresponding line in the modified text. Lines that have been added, removed, or changed are highlighted with distinct colors so you can quickly spot the differences.
Can I compare code with this tool?
Yes. The diff checker works with any plain text, including source code in any programming language. It is especially helpful for reviewing small code changes when you do not have access to a full Git client or IDE with built-in diff support.
Is there a size limit on the text I can compare?
The tool compares texts up to about 2,000 lines each. This limit keeps the comparison fast and prevents very large documents from freezing your browser, since all processing happens locally on your device. For typical documents, articles, and code files, the comparison is nearly instant.
Is the comparison case-sensitive?
Yes, the diff checker is case-sensitive by default. A line reading "Hello" and a line reading "hello" will be flagged as different. This is important for code comparison where casing often affects functionality.