aceclock Open the clock

Online Clock

A big, accurate digital clock showing the current time and date — free, full-screen ready, no download.

  • Free
  • No signup
  • Works offline
  • Instant

More on aceclock

Analog Clock Analog A clean analog clock with hour, minute and second hands. Stopwatch Stopwatch Start, stop and lap a precise stopwatch right in your browser. Countdown Timer Timer Set a countdown timer with an alarm — perfect for cooking, workouts and study.

aceclock.com is a tidy set of everyday time tools: a big online clock showing the current time, a classic analog clock, a precise stopwatch, and a countdown timer with an alarm. Everything runs in your browser — no app, no signup.

Time, at a glance

Keep the clock open as a desk or presentation clock, lap a workout on the stopwatch, or set the timer for cooking and focus sessions. Below, our guides cover time zones, telling time, and getting the most from each tool.

From our guides

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Telling time 24-Hour vs 12-Hour Clock Format: A Clear Guide A clear comparison of 24-hour and 12-hour clock formats, explaining how each works, how to convert between them, and when to choose AM/PM or military time. 6 min read Clocks explained How to Read an Analog Clock: A Simple Guide A beginner-friendly guide to reading an analog clock, explaining the hour, minute, and second hands step by step with practice tips for children and adults. 5 min read Stopwatch & timer tips How to Time With a Stopwatch and Record Laps A hands-on guide to timing with an online stopwatch and recording laps, covering precision to a hundredth of a second, capturing splits, and reading your results. 5 min read Telling time How to Use a Full-Screen Online Clock (Free, No Install) A complete walkthrough of how to use a free full-screen online clock in your browser, covering setup, going full screen, accuracy, formats, and everyday uses. 6 min read Stopwatch & timer tips How to Use an Interval Timer for Workouts A practical guide to using an online interval timer for workouts, covering work and rest periods, HIIT and Tabata setups, and how to train hands-free with clear beeps. 6 min read Productivity & focus How to Keep a Clock on Your Second Monitor A practical guide to keeping a live clock on a second monitor or spare screen, covering setup, full-screen mode, stopping the display from dimming, and useful layouts. 6 min read Productivity & focus Using an Online Clock for Better Time Management A practical guide to using a free online clock for better time management, covering time awareness, planning your day in blocks, beating distraction, and staying on schedule. 5 min read Productivity & focus The Pomodoro Technique With a Free Online Timer A practical guide to the Pomodoro technique using a free online timer, covering the 25-minute method, work and break cycles, setup steps, and tips to stay focused. 6 min read

Frequently asked questions

Is aceclock.com free?
Yes — every tool is free, with no signup and no download.
Does it work on my phone?
Yes — it works in any modern browser on phones, tablets and computers.
Is the time accurate?
It shows your device's time, which is normally network-synced, so it's as accurate as your device's clock.