Python Diff Checker
Paste two versions of Python code to compare additions, removals and edited lines with Python syntax highlighting. The diff runs locally in your browser.
元のテキスト
変更後のテキスト
Python syntax locked
This page automatically highlights Python tokens, so you do not need to pick a language before comparing files.
Private local compare
The diff runs in your browser. Source code, API payloads and configuration files are not uploaded to a server.
Split or unified review
Use split view for side-by-side review, unified view for compact patches, and hide unchanged lines for large files.
Compare Python files online
This Python diff checker is built for developers who need a fast, private way to compare code and configuration changes. Paste two versions, run the comparison, and review additions, removals and inline edits with Python syntax highlighting already enabled.
Paste or upload the original Python file on the left.
Paste or upload the changed Python file on the right.
Compare the result in split or unified view, then hide unchanged lines when you only need the edited regions.
Private browser-based Python comparison
The diff runs locally in your browser, which keeps source code, API responses, secrets and configuration files on your device. One recent session may be stored in your browser storage for restore, and you can clear it from the tool at any time.
Common Python diff workflows
Review function, class and import changes.
Check indentation-sensitive edits with line numbers.
Python syntax highlighting
Highlighting is locked to Python on this page, so the language selector stays out of the way. The parser focuses on tokens such as imports, functions, classes, decorators while the diff engine highlights the actual text changes.
.py, .pyw
Reference: Python documentation
Python diff checker FAQ
What is a Python diff checker?
A Python diff checker compares two versions of Python content and highlights added, removed and edited lines. This page locks syntax highlighting to Python, so language tokens are easier to scan while reviewing changes.
Does this Python diff tool upload my code?
No. The comparison runs in your browser. Your Python files are not uploaded to a server when you click Compare.
Which Python file types can I compare?
You can paste or upload plain-text files such as .py, .pyw. Any text file can be compared, but this page highlights Python syntax automatically.
Can I compare large Python files?
Yes. Large comparisons run in a background worker so the browser stays responsive. Very large files may still take a few seconds on your device.