Code Difference Tool — Compare Two Code Files Side by Side

Code Difference Comparison Tool

Compare two texts or code snippets side by side. Differences are highlighted line by line — deleted lines in red, added lines in green.

Side-by-side & inline views Color-coded diff Instant client-side
Paste two versions to compare
Original / Old Version
Revised / New Version
Paste TextPaste two versions of text, code, or documents
CompareClick Compare for an instant side-by-side diff
See DiffsRemoved lines in red, added lines in green
ReviewSwitch between side-by-side and inline views

About Code Difference Comparison Tool

The Code Difference Comparison Tool is a free online diff checker that highlights the differences between two pieces of code or text side by side. It is an essential tool for developers reviewing changes, writers comparing document versions, and anyone who needs to spot what has changed between two text blocks quickly.

Paste the original text on the left and the revised version on the right. The tool highlights added lines in green, removed lines in red and unchanged lines in white — giving you a clear visual diff in seconds without needing to install any software like Git or a code editor.

How to Use the Diff Tool

  • Paste the original content in the left panel
  • Paste the revised content in the right panel
  • Click Compare — differences are highlighted instantly
  • Added lines appear in green, deleted lines in red

Use Cases

  • Reviewing code changes before committing to version control
  • Comparing configuration files to find what changed
  • Checking plagiarism by comparing two documents
  • Proofreading edited articles against the original draft
  • Debugging by comparing working and broken code versions

Works with any text — code, prose, JSON, HTML, config files. No login or download required. Results are completely client-side for privacy.

Frequently Asked Questions

What types of text can I compare?
Any plain text content: code (HTML, CSS, JS, PHP, Python, etc.), articles, contracts, logs, JSON, XML, and more. Copy-paste any text from any source into the two panels and click Compare.
What is the difference between Side by Side and Inline view?
Side by Side shows the original and revised versions in two parallel columns, making it easy to scan both simultaneously. Inline view shows all changes in a single column with insertions and deletions interleaved — useful for seeing sequential changes.
Is my text sent to the server?
No — the comparison runs entirely in your browser using JavaScript. Your text never leaves your computer, making this tool completely safe for sensitive code, contracts, or confidential documents.
How can I compare two code files?
Open both files in a text editor, select all (Ctrl+A), copy, and paste into the appropriate panel. For Git users, the diff checker is a quick way to visualize changes without running terminal commands.

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