Compare two code snippets and highlight line-by-line differences
Original (A)
Modified (B)
Compare two code snippets line by line online free. Paste the original version and modified version, click Compare, then review added lines in green, removed lines in red, line numbers for both sides, and a summary of added, removed, and unchanged line counts. Works with any programming language or plain text format. All processing happens in your browser, making it useful for quick code reviews, debugging, comparing configuration files, and understanding small file changes without opening Git tools.
Code diff viewers are essential for software development. During code reviews, you need to see exactly what changed between versions. When debugging, comparing the working version with the broken version reveals the cause. When merging branches, understanding the differences prevents conflicts. When reviewing pull requests without git access, a diff viewer shows the changes clearly. This tool provides a quick, no-setup diff view for any two code snippets.
Lines prefixed with + (green) are new lines added in version B. Lines prefixed with - (red) are lines removed from version A. Unchanged lines have no prefix and are shown in the default color. The line numbers on the left show the position in version A, and on the right show the position in version B. When a line is modified, it appears as a removal (old line) followed by an addition (new line).
This tool is most useful for quick comparisons: checking a config change, comparing two snippets from a pull request, reviewing a small bug fix, comparing copied text, or explaining a change to a teammate. For large repositories, merge conflicts, rename detection, or advanced algorithms, use Git, your IDE, or a dedicated diff tool.
The viewer compares line positions in a straightforward way. It does not detect moved blocks, renamed files, word-level changes, or semantic code changes. When a line changes, it may appear as one removed line and one added line. Use the output as a fast visual aid, then rely on source control tools for final code review and merge decisions.
Code Diff Viewer Online Free is useful when you need to complete a focused task quickly without installing desktop software, creating another account, or switching into a heavy workflow. It works well for quick checks, conversions, previews, cleanups, generation tasks, and everyday operations where speed and consistency matter. Compare two code snippets line by line online free. Paste the original version and modified version, click Compare, then review added lines in green, removed lines in red, line numbers for both sides, and a summary of added, removed, and unchanged line counts. Works with any programming language or plain text format. All processing happens in your browser, making it useful for quick code reviews, debugging, comparing configuration files, and understanding small file changes without opening Git tools.
Start with a small sample so you understand how Code Diff Viewer Online Free handles your input, then apply it to the full task. Review the important fields, copy or export the result, and test it in the place where you plan to use it. This keeps the tool fast while still giving you a practical quality-control step before production use.
Currently the tool shows plain text diffs. Syntax highlighting may be added in a future update.
There is no hard limit. The tool handles large files, though very large diffs may be slow to render.
Green lines (prefixed with +) are lines that exist in the modified version (B) but not in the original (A). They were added.
Red lines (prefixed with -) are lines that exist in the original (A) but not in the modified version (B). They were removed.
Currently the tool requires pasting text. File upload support may be added in a future update.
Yes. Code Diff Viewer Online Free is designed as a free browser-based utility for quick personal, learning, and professional workflows.
No. You can use Code Diff Viewer Online Free directly in a modern browser such as Chrome, Edge, Safari, or Firefox.
Yes. The page is responsive and can be used on phones and tablets, although desktop is usually more comfortable for long input or repeated copy operations.
Use clean input, test with a small sample first, review the output carefully, and adjust any details that depend on your final use case.
In most cases, yes. You can use the generated or processed output in personal and commercial projects, but legal, financial, medical, or security-sensitive work should still be reviewed by a qualified person.
The tool is built for quick browser workflows. You should still avoid entering highly sensitive data unless the specific tool clearly states how the data is handled.
Many tools include copy or download actions. If a dedicated export is not available, you can usually copy the visible result manually.
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Format và phân tích API response.
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