Your data is safe. All comparisons happen 100% in your browser. Nothing is uploaded.
This tool uses the powerful jsdiff library to perform comparisons directly on your device. When you paste your text and click 'Compare', our code runs locally in your browser. Your data never leaves your computer and is never sent to our servers. This makes it the perfect tool for comparing sensitive documents, code, or private notes without any security concerns.
Yes, it's 100% free to use. There are no hidden costs, feature limitations, or usage caps.
Our tool's core principle is "privacy by design". The entire comparison logic runs using JavaScript in your local browser. Your text is never sent over the internet to our servers or any third party. You can confirm this by loading the page, disconnecting from the internet, and seeing that the tool still works perfectly.
No, there is no hard-coded character limit. Since all processing happens on your own computer, the practical limit is determined by your browser's performance and your device's memory. For the vast majority of use cases, including very long articles or code files, it will perform instantly.
This tool is designed to compare plain text. It does not directly support file uploads like .docx or .pdf. To compare such documents, you need to copy the text from the document and paste it into the input fields.
You can absolutely use it to compare code snippets from any programming language. It accurately shows additions and deletions. However, it does not currently offer language-specific syntax highlighting within the results. Its strength lies in its speed, simplicity, and confidentiality for any kind of text, including code.