Random Timer
Set a shortest and longest time, and the timer secretly picks one duration in between and counts it down — nobody knows when it will ring.
Most timers count down a length you chose. This one counts down a length nobody chose: you set the shortest and longest the round may last, the timer draws one duration at random inside that range, and the countdown begins with the length kept secret. The screen shows that the timer is running, not how long is left — that is the whole game. When it rings can be 20 seconds away or four minutes away, and everyone in the room has to keep going until it does.
Set the shortest and longest a round may last. One duration is drawn at random — and stays secret until the beep.
The drawn duration is never shown while the timer runs.
Need a length you choose and can watch? Use the Countdown Timer. Need repeating work and rest rounds? Use the Interval Timer.
Quick answers
What is a random timer?
A timer that chooses its own duration. You give it a shortest and a longest possible length, it secretly draws one duration inside that range, and counts down to a beep without showing how long it picked.
Because the length is hidden, nobody can pace themselves against the clock or stall for the finish. The duration is fixed at the moment you press Start and is revealed on screen when the timer rings, so the result is checkable afterwards.
How is a random timer different from a countdown or an interval timer?
A countdown timer runs a fixed length you set and displays it. An interval timer repeats fixed work and rest periods. A random timer draws the length at random, hides it, and runs once.
The three tools answer three different needs: a known deadline (Countdown Timer), a repeating training pattern (Interval Timer), and an unpredictable finish (this tool). If players can watch the seconds and time their last move, the random timer is the one that removes that advantage.
Is every duration in the range equally likely?
Yes. The duration is drawn uniformly from every whole second between your minimum and maximum, using crypto.getRandomValues with rejection sampling, so no part of the range is favoured.
Uniform matters in games: if durations clustered in the middle, experienced players would learn to expect the ring around the same point every round. Here a 31-second draw and a 3-minute draw from the same 30-second to 3-minute range are drawn by exactly the same rule, each second with the same chance.
How to use
- Set the shortest length a round may last and the longest it may last — in seconds, or switch a field to minutes. The range can run from 5 seconds up to 60 minutes.
- Press Start random timer. One duration inside your range is drawn and the countdown starts; the screen shows Running, never the length.
- Keep playing, discussing or working until the beep. The screen then shows Time up and reveals the duration that was drawn.
- Use Pause if the round is interrupted, Cancel to abandon it, and Start again for a fresh draw — every press draws a new duration.
About this tool
That makes it a different tool from the two timers already on this site, and the difference is worth stating plainly. The Countdown Timer counts to a fixed moment or a fixed length that you set and can see — a deadline, a launch, a known three minutes. The Interval Timer repeats a fixed pattern — 40 seconds of work, 20 seconds of rest, round after round — for training. This Random Timer does neither: the duration itself is the random part, drawn fresh on every press, and it runs exactly once. If you can see the number, it is not this tool; if the pattern repeats, it is not this tool either.
The draw is a single uniform pick from every whole second in your range, made with the browser cryptographic random source and rejection sampling, so a duration near the minimum is exactly as likely as one near the maximum — there is no clustering in the middle and no favouring of round numbers. Ranges run from 5 seconds to 60 minutes. When the time is up the timer beeps and shows you the duration it had picked, so a disputed round can be settled honestly: the length was fixed the moment you pressed Start, never adjusted mid-count.
Everything runs in this page, on your device — the draw, the countdown and the beep. Nothing is uploaded, sent anywhere or saved, and closing the tab stops and clears the timer. Teachers use it for timed discussions that cannot be gamed by watching the clock, party hosts for pass-the-parcel and statue games, and coaches for drills where reacting, not anticipating, is the skill being trained.
Random timer vs countdown vs interval timer
| Tool | Who chooses the length? | Can you see it? | Repeats? | Best for |
|---|---|---|---|---|
| Random Timer (this page) | The tool, at random inside your range | No — revealed when it rings | No, one round | Games, timed discussions, reaction drills |
| Countdown Timer | You, exactly | Yes | No | Deadlines, launches, known lengths |
| Interval Timer | You, as a work/rest pattern | Yes | Yes, round after round | HIIT, Tabata, circuit training |
| Pomodoro Timer | You, as a focus/break pattern | Yes | Yes, in cycles | Focused work and study sessions |
Frequently asked questions
Why does the screen not show the remaining time?
Because hiding it is the function. A visible countdown lets people pace, stall or time a final move; a hidden one keeps everyone honest until the beep. You will see that the timer is running, a pause control, and — only after it rings — the duration it had drawn.
Can I peek at the drawn duration while it runs?
No — there is no peek button, by design, so the person running the game is playing fair by construction rather than by promise. Pause and Cancel never reveal the length either. When the timer finishes, the duration is shown, so the draw can be checked after the round is over.
What range can I set?
The minimum can be as low as 5 seconds and the maximum as high as 3,600 seconds (60 minutes). The two fields accept seconds or minutes — choosing minutes just multiplies what you type by 60. If the minimum ends up above the maximum, the tool says so and does not start.
Does the timer keep running if I switch tabs?
The countdown is based on the device clock rather than on counting screen updates, so switching tabs does not stretch or shrink the round — when you come back, the remaining time is the true remaining time. Browsers can mute or delay the sound in a background tab, so keep the tab audible if the beep matters. Keep the device awake for long rounds; a sleeping screen can suspend the page.
How is this different from the Pomodoro or stopwatch tools?
A stopwatch counts up, openly, until you stop it. A Pomodoro timer runs a known focus length. This timer counts down a hidden, randomly drawn length exactly once. Each tool is linked under this one, so you can pick the behaviour the activity actually needs.
Is anything stored or sent anywhere?
No. The draw and countdown run in your browser tab, the beep is generated on the device, and nothing is uploaded, logged or kept. Closing the tab stops the timer and wipes it.
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