Code Diff Checker
Compare two code snippets side by side. Highlights added, removed, and modified lines across any programming language — Python, JavaScript, Go, SQL, shell scripts, and more.
Compare Code Snippets Instantly
Paste two versions of a function, file, or config and see exactly what changed — line by line. No git required. Useful for code reviews, debugging, and comparing LLM output against your original.
- Any language: Works with Python, JavaScript, TypeScript, Go, Rust, SQL, shell, and any text-based format
- Line-level and inline diff: See which lines changed and exactly which characters within them
- Side-by-side or unified view: Switch to match your preference
- Private: Code never leaves your browser — safe for proprietary code
When to Use a Code Diff Tool
- Reviewing LLM suggestions: Paste your original function and the AI-suggested version to see exactly what changed before accepting it
- Manual code review: Compare a colleague's snippet against the original when you don't have git context available
- Debugging regressions: Paste the working and broken version of a function to isolate what changed between the last working state and now
- Config comparison: Compare
nginx.conf,sshd_config, or environment-specific config files between servers - Database migration review: Compare SQL migration scripts before and after edits to verify the exact changes
Related Diff Tools
- JSON Diff Tool — Structured comparison for JSON objects
- YAML Diff Checker — Compare Kubernetes manifests, CI configs, and Helm values
- XML Diff Checker — Compare XML configs and API payloads
- Text Diff Checker — General-purpose text comparison
Frequently Asked Questions
How is this different from git diff?
git diff requires files to be tracked in a git repository and shows changes relative to a previous commit or staged state. This tool lets you diff any two text blocks — code snippets, clipboard contents, or output from different sources — without a repository. It's useful when you have two versions of something that aren't in git, like comparing a snippet from documentation against your implementation, or reviewing a suggested refactor from an AI tool.
Can I compare minified or obfuscated code?
Yes, but the diff will be hard to read — a single changed character in a minified file shows the entire line as modified. For meaningful comparison of minified code, first pretty-print or format both versions (use the JSON formatter for JSON, a code formatter for JS/CSS), then diff the formatted output. The diff tool works on whatever text you paste — formatting quality determines readability.
Does the diff ignore comments and whitespace?
By default, all content is compared exactly. Use the "ignore whitespace" option to skip leading/trailing whitespace differences — useful when code was reformatted but not changed functionally. Comment-only changes will still show as diffs. There's no language-aware mode that strips comments automatically, since "comments" means different things across languages (#, //, /* */, --, etc.).