Set the timer to 12 hours

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How to use the online timer

Keeping track of a 12 hours fasting or eating window is easier with a timer running than trying to remember what time you started. Set it the moment your window opens or closes, check back whenever you like without resetting anything, and let it count down in a browser tab you can leave open on your phone or computer. No app, no account, just the number you need.

There's no setup beyond pressing Start, and the countdown handles the rest on its own from that point. Since it runs inside the browser, keep the tab open for the timer to keep an accurate count; you can switch to other tabs in the meantime, but closing this one out resets things. When the countdown hits zero, a sound plays so you're not stuck staring at the numbers.

Setting an egg timer or fumbling with a phone app both work, but neither is as quick as a browser tab you already have open. There's no app store, no update prompt, and no login screen between you and starting the count. It's free and needs no registration, it works on any device with a browser, and closing other tabs won't affect it as long as this one stays open. If you would rather say put a timer on for 12 hours, that works too — press Start and the page does the rest.

Common questions

Can I set a custom time instead of the preset?

Yes, most pages let you adjust the minutes and seconds directly, so you're not limited to the exact length shown in the page title.

Does the timer work without an internet connection?

The page needs to load once, but the countdown itself runs locally in your browser, so a dropped connection partway through won't stop it.

Will the timer still run if my laptop goes to sleep?

No, if the device sleeps or the browser is suspended, the countdown pauses along with it, so keep your screen awake for an accurate result.

Is there a cost to use the timer?

No, it's free to use, with no registration, sign-up, or hidden limit on how many times you can run it.