ScreenTranslate is a macOS utility designed to provide instant translation of on-screen text without requiring users to copy and paste content into external translation services. The tool was created specifically to solve the problem of translating uncopyable text found in images, videos, and locked PDFs, allowing users to understand content directly within their workflow.

The primary feature is Drag-to-Translate, which provides instant translation results by simply dragging over any area containing text. This eliminates the need to switch between applications or browser tabs, helping users maintain their workflow continuity. The application operates with a privacy-first approach, offering a native macOS experience that collects no user data.

The tool works by capturing text from any on-screen area through a simple drag gesture, then instantly displaying the translation without requiring users to leave their current application window. This approach was inspired by ScreenHint's seamless capture functionality but focused specifically on translation use cases.

The main benefit is eliminating workflow interruptions caused by switching to Google Translate or other translation services. Users can stay focused on their current task while quickly understanding foreign language text encountered during work or browsing. The tool is particularly useful for translating text that cannot be easily copied, such as text embedded in images or protected documents.

ScreenTranslate targets macOS users who frequently encounter foreign language text in their daily workflow, particularly those who need to translate content without disrupting their current tasks. The application is built as a native macOS utility and represents a solo project by developer Changmin Han.