Code Compare
Free online tool · runs in your browser
Diff two code blocks instantly.
Quick tutorial
- 1Paste original code in the left panel and modified code in the right.
- 2View differences side-by-side or as a unified diff.
- 3Use Ignore whitespace to compare without leading/trailing spaces.
Free online code compare
Diff two code blocks side-by-side or as a unified patch. Paste original and modified text to highlight added, removed, and unchanged lines. Ignore whitespace when indentation noise hides the real change. This is a line-based online diff checker — it does not detect moved blocks or intra-line character highlights.
How to use Code Compare
- Paste original code in the left panel and modified code in the right.
- View differences side-by-side or as a unified diff.
- Use Ignore whitespace to compare without leading/trailing spaces.
Limitations
- Line-based diff — does not detect moved blocks within the same file.
- Character-level intra-line highlights are not supported.
Example
Input
Original vs modified code
Output
+ added lines - removed lines
FAQ
Frequently Asked Questions
Is this like Git diff?
It produces a unified-style view of added and removed lines. It is not a Git client and will not compare commits.
Can I compare files from disk?
Paste file contents into the two panels. Direct binary file compare is not supported.
Side-by-side vs unified?
Side-by-side shows both versions aligned; unified shows classic +/- diff output.
Can I compare files?
Paste file contents into the panels. Direct file upload is not required.
Is Code Compare free to use?
Yes. Code Compare on ShadowReference is free, with no account, no watermarks, and no server-side processing.
Does this tool send my data to a server?
No. All processing happens locally in your browser. Your input never leaves your device.