[{"data":1,"prerenderedAt":86},["ShallowReactive",2],{"page:type=timer&slug=30-seconds&locale=en":3},{"locale":4,"alternates":5,"title":8,"description":9,"h1":10,"lead":11,"breadcrumbs":12,"sections":21,"faq":36,"related":49,"updated":80,"tool":81,"schema":83},"en",{"es":6,"en":7},"\u002Ftemporizador\u002F30-segundos","\u002Fen\u002Ftimer\u002F30-seconds","30 seconds timer ⏱ online with alarm","Free 30 seconds timer: press Start and an alarm rings when it ends. Full screen, several sounds and works offline.","30 seconds timer","30 seconds countdown with alarm.",[13,16,19],{"name":14,"path":15},"Home","\u002Fen",{"name":17,"path":18},"Timer","\u002Fen\u002Ftimer",{"name":20,"path":7},"30 seconds",[22,26,32],{"paragraphs":23},[24,25],"This timer is set to 30 seconds. That is 30,000 milliseconds. 120 timers like this fit in one hour and 2,880 in a day.","During 30 seconds a resting heart beats about 35 times and a person walks roughly 40 metres at an easy pace.",{"heading":27,"list":28},"What is a 30 seconds timer good for?",[29,30,31],"short exercise sets and rest between reps","games and quizzes with a time limit","quick breathing exercises and stretches",{"heading":33,"paragraphs":34},"How to use it",[35],"Press the space bar or the Start button. When it reaches zero your chosen sound plays; on the main timer page you can add and chain several timers for intervals. Sound and volume settings are saved in your browser.",[37,40,43,46],{"q":38,"a":39},"How many seconds is 30 seconds?","30 seconds equals 30 seconds.",{"q":41,"a":42},"How do I set a 30 seconds timer?","Press Start: the time is already set. You can pause it, reset it, change the sound or go full screen.",{"q":44,"a":45},"Will it ring if I switch tabs?","Yes. The timer keeps running in the background and rings when it ends as long as the page stays open; the tab title shows the time left.",{"q":47,"a":48},"Will my screen turn off?","In supported browsers the \"Keep the screen on\" option uses the Wake Lock API to prevent it.",[50,53,56,59,62,65,68,71,74,77],{"label":51,"path":52},"10 seconds timer","\u002Fen\u002Ftimer\u002F10-seconds",{"label":54,"path":55},"15 seconds timer","\u002Fen\u002Ftimer\u002F15-seconds",{"label":57,"path":58},"20 seconds timer","\u002Fen\u002Ftimer\u002F20-seconds",{"label":60,"path":61},"25 seconds timer","\u002Fen\u002Ftimer\u002F25-seconds",{"label":63,"path":64},"35 seconds timer","\u002Fen\u002Ftimer\u002F35-seconds",{"label":66,"path":67},"40 seconds timer","\u002Fen\u002Ftimer\u002F40-seconds",{"label":69,"path":70},"45 seconds timer","\u002Fen\u002Ftimer\u002F45-seconds",{"label":72,"path":73},"50 seconds timer","\u002Fen\u002Ftimer\u002F50-seconds",{"label":75,"path":76},"All timers","\u002Fen\u002Ftimer\u002Flist",{"label":78,"path":79},"Stopwatch","\u002Fen\u002Fstopwatch","2026-10-23T13:43:20.735Z",{"seconds":82},30,{"app":84},{"name":10,"category":85},"UtilitiesApplication",1792763000723]