What is Gravatar Checker?
Gravatar (Globally Recognized Avatar) is a free service by Automattic that allows users to associate a profile image with their email address. Once registered, this avatar automatically appears on any website that supports Gravatar — including WordPress, GitHub, Stack Overflow, and thousands of other platforms — without the user needing to upload a photo on each site. Gravatar works by generating an MD5 hash of the lowercased, trimmed email address and appending it to the Gravatar CDN URL. This means anyone with an email address can check whether a Gravatar profile exists, making it useful for OSINT research, verifying whether an email address is active, and social profile aggregation.