Free Online Diff Checker - Compare & Merge HTML Code or Text
Paste or upload your HTML code or text to instantly see differences highlighted. Merge changes with one click and copy the final version to your clipboard.
All comparisons and merges happen directly in your browser. No text or code is uploaded to any server, ensuring your work remains secure and completely private.
Compare and Merge Differences
When working with text, HTML, or code, it’s common to lose track of changes. Our diff checker makes it simple to see what’s new, what’s been removed, and where conflicts exist. Differences are highlighted side by side so you can quickly spot edits without scanning line by line.
What sets this tool apart is the ability to merge changes directly in the editor. Instead of manually copying and pasting between files, you can accept or reject individual changes, build a clean final version, and copy it straight to your clipboard. This saves time and reduces the risk of missing important edits.
Security and privacy are also built in. Everything runs locally in your web browser — no text, code, or documents ever leave your computer. That means you can safely compare sensitive information, private notes, or business code without worrying about data being stored or shared. It’s a simple but important difference compared to online tools that send your files to a server.
Whether you’re a developer reviewing source code, a writer comparing drafts, or just someone double-checking a document, this diff checker gives you a reliable and private way to review and merge changes. Fast, accurate, and completely browser-based — it’s a tool you can trust for everyday work.