Code Diff & Compare

What is Code Diff & Compare?

Code review, merge-conflict hunting and config version comparison all need a good diff tool. This tool offers a GitHub-style side-by-side view: changed lines are aligned left and right with character-level highlighting of the exact edits, added/removed lines leave a gap on the opposite side, and line numbers run independently. Input is syntax-highlighted for JS/TS, JSON, CSS, HTML, SQL, Python, XML and YAML, and whitespace or case differences can be ignored with one click — especially handy when comparing code before and after formatting. All computation is local; your code never leaves the browser.

How to Use

1. Paste the two versions of code into the left and right panes
2. Choose the language and compare options (ignore whitespace / case)
3. Review the aligned differences and inline highlights in the dual-pane view

FAQ

How is this different from the Text Compare tool?

Text Compare is a traditional +/- unified view suited to natural language; Code Compare is a side-by-side view with aligned changed lines and character-level highlights, better for code and config files.

How does ignoring whitespace work?

During comparison, leading/trailing whitespace is stripped and runs of inner whitespace are collapsed to a single space before judging differences — the display still shows the original content, matching GitHub's "Hide whitespace" behavior.

Can it compare large files?

Line-level comparison handles thousands of lines; inline character highlighting applies only to changed lines, keeping the cost controlled. Split files of tens of thousands of lines before comparing.

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