Compare two texts and see differences highlighted. Perfect for code review, document comparison, and version control.
This free text diff tool compares two blocks of text line by line and highlights every difference between them. Additions are shown in green, deletions in red, and unchanged lines in gray, giving you an instant visual overview of what changed between two versions of any text.
A "diff" (short for difference) is a comparison between two versions of a text that shows exactly what was added, removed, or changed. The concept comes from software development, where diff tools are used to compare versions of source code files. However, text diff is equally useful for comparing documents, configuration files, emails, articles, and any other text content.
A line-by-line diff is the most common format. Each line in the original text is compared to the corresponding line in the modified text. Lines that match are shown as unchanged. Lines that exist only in the original are marked as deleted. Lines that exist only in the modified version are marked as added. Lines that exist in both but with different content are shown as a deletion followed by an addition.
This tool provides a clear, color-coded diff view along with statistics showing the total number of added, removed, changed, and identical lines. This makes it easy to assess the scope of changes at a glance before diving into the details.
Comparing two texts is straightforward with this tool:
For the most useful diff output, make sure both texts are consistently formatted before comparing. If one version uses Windows-style line endings (CRLF) and the other uses Unix-style (LF), you may see false differences. Pasting text directly from the same source type avoids this issue.
Use the "Swap Texts" button when you want to see the diff from the opposite perspective — for example, to see what was removed from the modified version rather than what was added. This is useful when reviewing rollbacks or reversions.
For large documents, focus on the statistics first. If the number of changed lines is small relative to the total, the documents are mostly identical and you only need to review a few sections. If most lines are marked as changed, the documents may be fundamentally different and a full review is needed.
While version control systems like Git have built-in diff tools, they require a repository setup and command-line access. This browser-based diff tool works instantly with any text you can paste — no repository, no terminal, no configuration needed. It's perfect for quick comparisons outside of a development workflow.
The clean, color-coded output is easy to read even for non-technical users. Writers, editors, project managers, and anyone who works with text documents can use this tool without any technical background. It's a universal utility for anyone who needs to compare two versions of anything.
Your privacy is our priority. All processing happens entirely in your browser using JavaScript. No files, data, or inputs are ever uploaded to any server. Everything stays on your device, making this tool completely safe to use with sensitive content.
The tool uses a line-by-line diff algorithm similar to the Unix diff command. It identifies added lines (shown in green), removed lines (shown in red), and unchanged lines. This is the same approach used by Git for showing file changes.
Yes. Paste any text including code, configuration files, JSON, SQL, or prose. The tool compares line by line regardless of content type. For best results with code, make sure both versions use consistent indentation.
If the line endings or whitespace differ between the two versions, the entire line will show as changed. Try using the ignore whitespace option if available, or ensure both texts use the same line ending format (LF vs CRLF).
Yes. Paste the old version in the left panel and the new version in the right panel. The diff will highlight exactly what changed, making it easy to review edits in contracts, articles, or any text document.
A line diff shows entire lines as added or removed. A word diff highlights the specific words that changed within a line, which is more precise for prose. This tool uses line-level diffing, which is standard for code comparison.