Our free web tagging service offers access to the latest version of the tagger, CLAWS4, which was used to POS tag c.100 million words of the original British National Corpus (BNC1994), the BNC2014, and all the English corpora in Mark Davies' BYU corpus server. You can choose to have output in either the smaller C5 tagset or the larger C7 tagset.
This free service is not intended for extremely large numbers of repeated submissions from the same site. Our tagging service and CLAWS licences are available if you have hundreds of millions of words to tag. Please contact Paul Rayson (email: firstname.lastname@example.org), also use this address if you have technical problems.