About stopwatch-online.com

Our mission

We believe a stopwatch shouldn't ask you to sign up. A timer shouldn't bury its Start button under three banner ads. A simple online tool should open instantly, work exactly the way you expect, and stay out of your way.

stopwatch-online.com is a small project built around that idea. Every tool on this site loads in seconds, runs entirely in your browser, requires no account, and is free for personal and professional use.

What we offer

The site is a growing suite of browser-based time tools. Each one focuses on a single job and tries to do it as well as possible:

• Stopwatch - centisecond-accurate timing with unlimited laps, splits, fastest/slowest highlighting, fullscreen mode, and keyboard shortcuts.
• Timer - a clean countdown timer with custom labels, alarm sounds, and a recent-timers list.
• Alarm Clock - browser-based alarm with a live wall clock, multiple alarms, and quick presets.
• Pomodoro - the classic focus/break technique with configurable sessions.
• World Clock - track time across multiple cities at a glance, with day/night indicators.
• Age Calculator - precise age in years, months, weeks, days, hours, and minutes.
• Holidays - public holidays for many countries, with countdowns to the next holiday.

More tools are added over time. The list above is the current line-up; the menu in the top-left always reflects what's available.

What we believe in

Speed

Every page is a single static HTML document with one CSS file and one JavaScript file. There are no frameworks, no large libraries, no third-party widgets. The result is a tool that opens about as fast as your browser can render text.

Privacy by default

We don't ask for your name, your email, or your account. The tools work entirely in your browser - timing, lap data, theme choices, and recent sessions are stored locally on your device, never on our servers. For the full picture, see our Privacy Policy.

Accuracy

The stopwatch and timer use the browser's performance.now() high-resolution timer, which is sub-millisecond accurate on modern devices. We display centiseconds (1/100 of a second) - the same precision used by most consumer and amateur sports stopwatches.

No clutter

No newsletter pop-ups, no cookie walls demanding agreement before you can use the tool, no countdown to a paywall, no "premium" tier behind a sign-up. The Start button is always the most obvious thing on the screen.

Works everywhere

Every tool is responsive and tested on desktop, tablet, and mobile - Chrome, Safari, Firefox, and Edge. Once a page is loaded, the tools keep working even if your internet connection drops.

How it works under the hood

This is a static website. There is no backend database, no user accounts, and no server-side logic to remember you. When you visit the stopwatch, your browser:

• Downloads the HTML, CSS, and JavaScript for that single page.
• Renders the tool and waits for your input.
• Saves a small amount of state (theme preference, current timer state, recent timers) in your browser's localStorage so the next visit feels seamless.
• Runs the timing logic locally - no requests are sent to us while the stopwatch is counting.

That means your data never leaves your device. It also means the tool keeps running if you go offline mid-session.

Who it's for

People who need a quick, reliable timer in the browser - and nothing more:

• Athletes and coaches timing intervals, sprints, and training sets.
• Students and teachers running timed exams and class activities.
• Cooks and bakers tracking proofing, simmering, and resting times.
• Speedcubers, gamers, and puzzle solvers logging session times.
• Remote workers and freelancers measuring focused work blocks.
• Public speakers rehearsing talks and pacing presentations.
• Anyone who just needs a stopwatch and doesn't want to download an app.

Contact

Found a bug? Have an idea for a new tool, a translation, or a feature improvement? We read every message.

Email us at: contact {@} stopwatch-online {.} com

(The address is written that way to keep automated scrapers from spamming the inbox - to email us, replace {@} with @ and {.} with . in your mail client.)

Please include the name of the tool you're writing about (Stopwatch, Timer, etc.), your browser and device, and a short description of what you saw or what you'd like to see. Screenshots help.