Temporizador is a web based countdown timer tool accessible at temporizador.cc. Its primary function is to allow users to set a countdown timer by specifying hours, minutes, and seconds, and to receive both a visual alert and an audible notification when the time reaches zero. The timer calculates the remaining time from a fixed end time rather than accumulating delays, which helps maintain accuracy even when the browser tab is in the background. The tool offers several features for configuring and managing timers. Users can choose from preset quick durations, edit a custom duration up to 99 hours, or select from recently used timers. The interface includes options to display the timer in full screen, copy a direct link to the current timer settings, and adjust the sound toggle. The timer continues to count down when switching tabs, though mobile devices may suspend the browser when the screen is locked. No registration or account is required, and all configuration data is stored locally on the user’s device. Typical use cases include studying, cooking, exercising, and taking breaks. The workflow involves selecting or entering a duration, pressing the start button, and then waiting for the timer to reach zero. The page must remain open for the sound to play, and the device volume must be unmuted. Browsers require an initial user interaction, such as clicking the start button, before audio can be played. The tool is designed to be straightforward and functional, operating entirely within the browser without external dependencies.