Code Diff Viewer

Online Code Diff Viewer with Syntax Highlighting — Compare Code Files

Compare two code files side by side with beautiful syntax highlighting for 50+ languages. Spot changes at a glance in a professional unified or split diff view.

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Best For

Use Code Diff Viewer when you need to inspect, convert, compare, or package technical material quickly. The page is designed around a focused workflow: bring in the code, data, markup, URL, or technical file, make the adjustment or check, then copy or download the result for your repo, ticket, documentation, or handoff.

Most work happens locally in your browser, which keeps files and text on your device and makes quick repeat checks practical. Review the output, then copy or download the result for your repo, ticket, documentation, or handoff.

Common workflows

  • Review Pull Requests
  • Compare SQL Migrations
  • Compare Configuration Files
  • Compare API Schemas

Features

50+ Languages

Automatic syntax highlighting for JavaScript, TypeScript, Python, Rust, Go, Java, SQL, YAML, and many more.

Side-by-Side View

See the original and modified code in parallel columns so context is never lost.

Private by Default

Your code stays in your browser. Nothing is sent to any server.

How It Works

1
Paste original code

Enter the original version of your code in the left panel.

2
Paste modified code

Enter the new version of your code in the right panel.

3
Select a language

Choose the programming language for accurate syntax highlighting.

4
Review the diff

Changed lines are highlighted. Added lines appear in green, removed lines in red.

Frequently Asked Questions

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Popular Use Cases

Code Diff Viewer for Pull Request ReviewCompare SQL Migration Files with Syntax HighlightingDiff Configuration Files — YAML, JSON, TOML & MoreCompare API Schema Changes — OpenAPI & JSON Schema DiffCompare Terraform Configurations — Infrastructure Diff Viewer