Detailed Answer
It depends on the role. For general office jobs, most employers accept a self-reported speed or a quick in-house test during interviews. For data entry, transcription, legal/medical secretary, and government clerical positions, employers often request a verifiable typing certificate or proctored exam. Large staffing agencies (e.g., Robert Half, Adecco) require certificates from approved vendors. Having a certificate from a well-known site (e.g., Typing.com's certification) can differentiate you. However, many remote freelance jobs rely on your portfolio and a live screen-share test rather than a certificate.