Code Diff Viewer Online Free

Compare two code snippets and highlight line-by-line differences

Original (A)

Modified (B)

Code Diff Viewer Online Free - Compare Code Side by Side

Compare two code snippets line by line online free. Highlights added lines in green and removed lines in red with line numbers. Shows a summary of added, removed, and unchanged line counts. Works with any programming language or text format. All processing happens in your browser — your code never leaves your device. Perfect for code reviews, debugging, comparing file versions, and understanding what changed.

Key Features

Line-by-line diff comparison

Added lines highlighted in green (+)

Removed lines highlighted in red (-)

Line numbers for both versions

Added/removed/unchanged line count summary

Works with any programming language

Pre-filled example for quick start

100% browser-based

Free, no registration required

When to Use a Code Diff Viewer?

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.

Benefits

•Review code changes quickly and clearly
•Debug by comparing working vs broken versions
•Understand what changed between file versions
•Review pull requests without git access
•Compare configuration files for differences
•Teach code changes to team members visually

How to Compare Code

1Paste the original code in the left panel (A - Original)
2Paste the modified code in the right panel (B - Modified)
3Click 'Compare' to run the diff
4View added lines in green and removed lines in red
5Check the summary for total added/removed/unchanged counts
6Use line numbers to locate specific changes

Reading a Code Diff

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).

Frequently Asked Questions

Does it support syntax highlighting?

Currently the tool shows plain text diffs. Syntax highlighting may be added in a future update.

What is the line limit?

There is no hard limit. The tool handles large files, though very large diffs may be slow to render.

What does a green line mean?

Green lines (prefixed with +) are lines that exist in the modified version (B) but not in the original (A). They were added.

What does a red line mean?

Red lines (prefixed with -) are lines that exist in the original (A) but not in the modified version (B). They were removed.

Can I compare files instead of pasting text?

Currently the tool requires pasting text. File upload support may be added in a future update.

Related Keywords

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