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This PR adds a new To Fullwidth operation to CyberChef.
It converts ASCII halfwidth characters into their Unicode fullwidth equivalents, while preserving non-ASCII characters unchanged. Spaces are converted to U+3000, and printable ASCII characters are mapped to the corresponding fullwidth code points.
Halfwidth and Fullwidth Forms - wikipedia
This operation is useful for security testing and Unicode normalization analysis, especially when validating how different components such as frontend filters, proxies, WAFs, and backend frameworks process non-ASCII input. It also helps generate reproducible test cases for character handling, normalization behavior, and parsing consistency.
Unit tests are included for basic ASCII conversion, space handling, mixed-content input, and preservation of non-ASCII characters.
This is my first contribution to CyberChef, so thank you for reviewing it. If there is anything I should revise to better match the project’s conventions or expectations, I would greatly appreciate the guidance. Please excuse anything I may have overlooked.