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Countdown Timer

Free countdown timer with hours, minutes, seconds, and presets. Runs locally in your browser. Free online tool — no sign-up. Simple and accurate.

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How to use

1

Set the duration

Enter hours, minutes, and seconds, or tap a preset (1 / 5 / 10 / 25 min).

2

Start

Start the countdown; a soft alert plays when time reaches zero.

3

Pause or reset

Pause to hold remaining time, or Reset to reload your inputs.

Countdown timer specification

Version 2.0.0 · Runtime tested · Local-first

App status
  • Runtime tested Passed
  • Local-only Verified
  • Server data transfer None
  • App version 2.0.0

Local-first runtime specification · Review policy

Definition
A countdown timer subtracts elapsed time from a chosen duration until remaining time reaches zero.
What it does
Remaining milliseconds until a target end time, from hours/minutes/seconds or presets.
Inputs
  • Hours, minutes, seconds
  • Presets: 1 / 5 / 10 / 25 minutes
  • Start / Pause / Reset
Outputs
  • Remaining time as MM:SS.cc (or longer when hours are set)
  • Done state with optional local beep
Rules
remaining = max(0, endAt − now)
Assumptions
  • Duration is converted to milliseconds before Start.
  • Pause freezes remaining; Start resumes from that value.
  • Alert uses the Web Audio API when available.
Units
  • Duration: hours, minutes, seconds
Limitations
  • Zero or empty inputs yield zero remaining.
  • Presets are ignored while running.
  • Negative typed values are treated as zero.
Example
5 min preset → Start → remaining ticks to 00:00.00 → Done
Validation cases
  • 1 min preset → Remaining starts near 01:00.00
  • Pause mid-run → Remaining holds until Start
  • Reset → Reloads from hour/minute/second fields
Sources
  • Browser Date.now() end-time countdown
App version
2.0.0

About this tool

Details and tips for this tool.

The Countdown Timer counts down from a duration you choose. Use hour, minute, and second fields or one-tap presets, then Start—when time is up, the tool marks Done and can play a soft local alert.

Built for quick sessions on phone or desktop: set duration on the first screen, watch remaining time in the result panel, and pause or reset without leaving the page.

→ Alarm Clock › → Stopwatch › → Current Time › → To-do List ›

Frequently asked questions

Key distinctions behind the tool.

Is the countdown timer free?

Yes. Set a duration, start, pause, and reset with no account.

Can I use hour, minute, and second fields?

Yes. Enter hours, minutes, and seconds, or tap presets for 1, 5, 10, or 25 minutes.

What happens when time reaches zero?

The display shows Done and a short local sound plays when the browser allows audio.

Does the timer work if I switch tabs?

The end time is based on the clock, so remaining time still counts down; keep the tab open if you need the alert.

Is my timer data uploaded?

No. Countdown state stays on your device.