Code diff checker
Compare Source Code Online
Review code changes for PHP, Python, JavaScript, TypeScript, Java, HTML, CSS, TOML, YAML, SQL, shell scripts, and many other text-based code files. FileDiffChecker.com helps you compare source code online without installing software.
Compare code nowFast online code comparison without an account
Use the source code comparison page for quick reviews before commits, small patch checks, template edits, config changes, and copied snippets. The file diff checker highlights added, removed, and modified lines in a focused side-by-side view.
Code comparison works best when both files are formatted with the same style. If one file has been auto-formatted and the other has not, run your formatter on both versions first so the diff focuses on meaningful code changes instead of whitespace noise.
- Supported code extensions include .php, .py, .js, .ts, .java, .html, .css, .toml, .yaml, .sql, .sh, .go, .rs, .rb, .cs, .cpp, .swift, .kt, .vue, and more.
- Local browser processing keeps source code on your device.
- Compare related formats such as JSON, XML, and plain text.
Code review use cases
FileDiffChecker.com can help with quick checks for PHP template edits, JavaScript changes, TypeScript refactors, CSS updates, SQL query revisions, shell script edits, and configuration updates. It is especially useful when you need a quick visual comparison outside a full Git workflow.
The original side shows removed or changed baseline content, while the changed side highlights additions in the updated file. Use the next and previous controls to move through each change in order.