Yes, this service will accept French addresses…
However, all output fields will be standardized to their English versions. This service is primarily for correcting, validating and standardizing Canadian addresses. The current Canadian standard is English, and we convert the addresses to English to provide the most accurately standardized addresses possible. It is likely that we will add more support in the future for outputting addresses in standardized French formats as well in the future, however the rules for doing so are not as clear potentially leading to more inaccuracies in the result.