Paste your code, choose tabs or spaces and a tab size, and the tool converts the indentation throughout.
It's a matter of preference and project standards. Spaces ensure consistent appearance across editors. Tabs let developers choose their preferred width.
Common sizes are 2 spaces (JavaScript, JSON), 4 spaces (Python, Java, C#), or 8 spaces (old C code). Follow your project's conventions.
The tool converts all indentation uniformly. If your code has mixed tabs/spaces, run the conversion to standardize it.