No. There is no official free version, no online version, and no browser version of The Choicer Voicer. The game is a downloadable Windows and Linux game sold by its developer, YeahMaybe, on itch.io for $5 (or more, if you want to tip). That is the only legitimate way to get it.
A number of low-quality websites rank for searches like "choicer voicer online" or "choicer voicer free" and claim to offer the game in your browser. These are fake. At best they embed an unrelated game or ad wall; at worst they push downloads you should not run. Treat any site with these signs as a scam:
The community content around the game: the official default packs are a free download from YeahMaybe, and the community-made voice packs, dub packs, and other content you will find here on VoicerPacks are free too. You just need the real game to use them. See our install guide once you have it.