About this tool
Spotting the difference between two versions of a document, config file, or piece of text by eye is slow and unreliable, especially when the changes are small or the text is long. This tool compares two blocks of text side by side and highlights exactly what was added, removed, or changed, line by line, so you can immediately see what's different without manually scanning both versions. It's useful for reviewing edits to a document, comparing two versions of a configuration file, checking whether a copy-paste introduced unwanted changes, or verifying that a generated output matches an expected result. Comparison runs entirely in your browser — neither version of your text is sent anywhere.
Frequently asked questions
Does it compare word-by-word or line-by-line?
The comparison is primarily line-by-line, with highlighting showing which lines were added, removed, or modified between the two inputs.
Can I compare code snippets, not just plain text?
Yes, it works on any plain text input, including code, configuration files, or structured data — anything you can paste as text.
Is whitespace-only differences detected?
Yes, differences purely in whitespace or indentation are shown just like any other change, since they can matter in code and config files.
Is my text uploaded to a server for comparison?
No, the entire diff comparison runs locally in your browser using JavaScript.
Can I use this to check if two files are identical?
Yes — if there are no highlighted differences after comparing, the two texts are identical.