Code Diff Viewer & Comparator
Visually compare two revisions of code or text to spot modifications, additions, and deletions with precision.
Diff Comparison Output
What is the Online Code Diff Viewer?
The NexTools Online Code Diff Viewer is a browser-based utility that computes and renders the line-by-line differences between two code fragments, text documents, or configuration files. Reviewing differences between software revisions is critical during code reviews, debugging regressions, or inspecting changes before committing code to Git.
Unlike desktop diff tools that require installation, this tool runs instantly inside your browser. It highlights additions in soft green and deletions in soft red with line numbers, offering both Side-by-Side split and Unified inline modes while preserving 100% confidentiality of your private source code.
Key Capabilities & Features
Side-by-Side & Unified Views
Switch between dual-column side-by-side inspection and single-column Git-style unified inline diffs.
Ignore Whitespace Option
Filter out trivial indentation and formatting changes to focus exclusively on meaningful code edits.
Line Difference Metrics
Displays precise counts of added (`+`) and removed (`-`) lines for tracking delta impact.
Zero Server Transmission
Compare proprietary source files, API credentials, and internal documentation safely without cloud transmission.
How to Compare Code Online
Paste Original & Modified Code
Enter the original snippet on the left and the updated snippet on the right, or click "Load Sample".
Click Compare
The diff engine matches corresponding lines and computes additions and deletions instantly.
Toggle View Format
Switch between Side-by-Side and Unified views to easily share or inspect structural changes.
Frequently Asked Questions (FAQ)
What algorithm does this diff viewer use?
It implements the standard Myers Longest Common Subsequence (LCS) diff algorithm, the same mathematical approach employed by Git and GNU Diffutils.
Can I compare non-code plain text files or essays?
Yes. The tool compares any textual format including JavaScript, Python, HTML, Markdown, JSON, YAML, and prose manuscripts.
Are my files stored on your servers?
No. All diff computations occur 100% locally in your client's web browser RAM with zero server footprint.