1. a person or tool that removes or conceals the identity of someone or something
Usage: chiefly British spelling; American English typically uses 'anonymizer'; commonly used in computing and data protection contexts
2. software or a service that masks a user's IP address or personal information online
Usage: technical term

Examples

• The company uses an anonymiser to protect patient data in medical research.
• An anonymiser can help safeguard your privacy when browsing the internet.
• The survey employed an anonymiser to ensure respondents could not be identified.
• Data anonymisers are essential tools for compliance with privacy regulations.
• She installed an anonymiser on her computer to hide her browsing activity.