Timer, Stopwatch & Alarm
Three precise time tools, free and 100% browser-based.
Start a countdown, measure time to the hundredth of a second, or set an alarm. No sign-up, no installation, no blocking ads.
All tools
A selection of 12 time tools across Timer, Stopwatch and Alarm.
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Countdown
Countdown before the start (10, 9, 8… GO), then the stopwatch launches automatically.
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Online alarm clock
Use your browser as a morning alarm clock.
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How it works
Three steps, no installation.
Configure
Choose the duration, the time, or launch the stopwatch directly from your browser.
Launch
Start the tool with one click. Everything runs locally, no data sent.
Get the alert
Automatic end-of-countdown sound for the timer and alarm, continuous run for the stopwatch.
Why Convertly CHRONO
Simple, fast tools that respect your privacy.
Ultra-fast
Instant start, no loading, no blocking ads.
100% private
No account, no third-party cookies, no data sent to a server.
Free
All tools are free, with no sign-up and no usage limits.
Works offline
Once the page is loaded, the tool keeps working without a connection.
Guaranteed precision
Based on the system clock and the Web Audio API for maximum accuracy.
Mobile-first
Interface optimized for smartphone, tablet and desktop.
Frequently asked questions
Everything you need to know.