What file types does this diff checker support?

It works with any plain text format — JavaScript (.js), TypeScript (.ts), TSX/JSX (.tsx/.jsx), CSS/SCSS, JSON, HTML, Markdown, Python, and plain text. If it can be opened in a text editor, this tool can compare it.

Can I use this to compare TypeScript and TSX files?

Yes — paste the contents of any .ts or .tsx file and the tool will compare them line by line. Its ideal for reviewing component changes, catching accidental edits, or comparing before and after a refactor.

How is this different from Git diff?

This tool gives you an instant visual diff without needing Git or a terminal. Its great for quick comparisons — like checking what changed in a config file, comparing two API responses, or reviewing a colleagues changes before committing.

Does it handle large files?

Yes. The diff uses an LCS (Longest Common Subsequence) algorithm that handles large texts efficiently. Files with thousands of lines compare in milliseconds.

Does it ignore whitespace or formatting differences?

All differences including whitespace are shown by default — this is important for languages like Python or YAML where indentation is significant. This also helps catch accidental formatting changes in JS/TS files.

Is my code sent to a server?

No — all comparison happens entirely in your browser using JavaScript. Your code never leaves your device, making this safe to use with proprietary or sensitive code.

⚖️

Free Online Diff Checker

Compare two files or text snippets side by side. Highlights every addition and deletion. Supports JS, CSS, JSON, HTML, TSX and more. Free.

About this tool

Compare any two pieces of text or code side by side and instantly see every difference highlighted. Works with plain text, JavaScript, TypeScript, TSX, CSS, JSON, HTML, Markdown — anything that is text. Added lines appear in green, removed lines in red, making code reviews, config comparisons, and document change tracking effortless.

Original (A)

Modified (B)

How we calculate this

All calculations run entirely in your browser — no data is sent to any server. Here is exactly how this tool works:

Paste your original content in the left panel — plain text, JS, CSS, TSX, JSON, or any text format
Paste the updated or modified version in the right panel
Click Compare to instantly highlight every difference line by line
Green lines are additions, red lines are deletions — copy or share the result

Frequently Asked Questions

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📱Works on mobile & desktop