Diff Checker
Compare text differences
Frequently Asked Questions
How does the Diff Checker compare text?
Paste two texts side by side and the tool highlights differences line by line. Added lines show in green, removed lines in red, and modified lines show character-level changes. It uses the same diff algorithm as Git.
Can I compare code files?
Yes. The diff checker supports syntax highlighting for JavaScript, Python, HTML, CSS, JSON, and many other languages. Code-aware diffing makes it easy to spot changes in source files during code review.
What is the difference between inline and side-by-side diff?
Side-by-side shows the original and modified text in parallel columns. Inline (unified) shows changes in a single column with +/- markers. Side-by-side is better for reviewing; inline is more compact for sharing.
Can I ignore whitespace differences?
Yes. Toggle "ignore whitespace" to skip differences in spaces, tabs, and line endings. This is useful when comparing code that has been reformatted but not functionally changed. You can also ignore case differences.
Can I upload files to compare?
Yes. Upload two files directly instead of pasting text. The tool supports text files, code files, CSV, JSON, XML, and other text-based formats. Binary files are not supported — use specialized tools for those.