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Learn and practise programming in your browser. Pick a language: write code, run it in a real terminal and follow the lessons step by step.
Why Shiklo Tools?
Simple, private tools that just work — right in your browser.
- Private Everything runs in your browser. Files are never uploaded.
- Secure Encrypted HTTPS connection, and nothing you open is stored on our servers.
- No login required No account, no sign-up, no email. Just open a tool and use it.
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- Free All tools are free to use, with no limits.
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Frequently asked questions
Are my files or text uploaded anywhere?
No. Every tool runs inside your browser on your own device. Nothing you enter or open is sent to a server.
Do I need to create an account or log in?
No login is required. There are no accounts — open any tool and start using it straight away.
Are the tools really free?
Yes. All tools are free, with no limits or watermarks. The site is supported by ads.
Does it work on my phone?
Yes. The tools work in any modern browser on phones, tablets and computers.
Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
Which file types are supported?
PDF, Word, Excel, PowerPoint, OpenDocument and RTF documents, JPG, PNG, WebP, HEIC, AVIF, GIF and BMP images, MP4, MOV, WebM and MKV videos, MP3, WAV, M4A, OGG and FLAC audio, ZIP, 7z, RAR, TAR and GZIP archives, CSV, JSON, XML and plain text. Each tool lists exactly what it opens.
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Countdown Timer
An online timer with alarm, a countdown to any date you can share, and a stopwatch with laps. Keeps exact time in background tabs.
Three clocks in one page. The Timer counts down from any length you choose, with one-tap presets from 1 minute to 1 hour, pause and resume, and an alarm that beeps (and vibrates on phones) when time is up. The Countdown to a date shows the days, hours, minutes and seconds until an event such as a launch, a wedding, an exam or New Year, in any time zone, and gives you a link to share it. The Stopwatch measures elapsed time to the hundredth of a second and records laps.
Times are calculated from your device's clock rather than by counting ticks, so they stay exact even when you switch to another tab, and the remaining time is shown in the tab title. Nothing is installed and nothing is sent anywhere.
How to use Countdown Timer
- Choose Timer, Countdown to a date or Stopwatch.
- Timer: tap a preset or type a time such as 90, 1:30 or 1h 30m, then press Start.
- Countdown: enter the event name, date, time and time zone, then copy the link to share it.
- Stopwatch: press Start, Lap to record splits, and Stop when done.
Features
- Timer presets: 1, 3, 5, 10, 15, 25 and 30 minutes, and 1 hour.
- Type any time up to 100 hours: 90, 1:30, 1:30:00, 1h 30m or 45s.
- Pause, resume and reset; progress bar and time left in the tab title.
- Alarm sound for up to a minute, with vibration on supported phones.
- Countdown to any date and time in any time zone, with an event name.
- Shareable countdown link that shows the right time for every visitor.
- Stopwatch with hundredths of a second and laps, fastest and slowest highlighted.
- Exact in background tabs; works offline once loaded.
Timer, countdown or stopwatch?
Each mode suits a different job.
| Mode | Counts | Good for |
|---|---|---|
| Timer | Down from a length of time | Cooking, workouts, exams, the Pomodoro technique, presentations |
| Countdown to a date | Down to a moment in the calendar | Launches, birthdays, holidays, deadlines, New Year |
| Stopwatch | Up from zero, with laps | Running laps, speeches, experiments, timing tasks |
Typing a time
Besides the presets, you can type the length you need. A plain number means minutes, so 90 is an hour and a half. Clock style works too: 1:30 is one minute thirty seconds, and 1:30:00 is one and a half hours. You can also write units: 1h 30m, 2m30s or 45s. Press Enter to set the timer, then Start.
Why it stays accurate in the background
Browsers slow down pages in background tabs to save battery, so a timer that counts ticks of a second can drift by minutes. This timer remembers the exact moment it should end and compares it with the clock every time the display updates, so the time left is always right when you come back. The alarm has its own timeout for the exact end moment. Keep the tab open (it can be in the background) and the sound on; on phones, the browser may pause pages while the screen is locked.
Sharing a countdown
A countdown link stores the date, the time, the time zone and the event name in the part of the address after the # sign, which is never sent to a server. Anyone who opens the link sees the same moment counted down, converted to their own clock: a New Year countdown set for midnight in New York shows 10:30 in the morning on 1 January for a friend in India. Under the counter, the target is shown in the event's time zone and in yours.
The Pomodoro technique
A popular way to focus is to work for 25 minutes, then take a 5-minute break, and after four rounds take a longer break of 15 to 30 minutes. Use the 25 min preset for each work session and the 5 min preset for breaks. The time left shows in the tab title, so you can keep working in another tab and still see it.
Frequently asked questions
Is this online timer free?
Yes. It is free, needs no sign-up or download, and works offline after the page has loaded.
Will the alarm sound if the tab is in the background?
Yes, as long as the tab stays open and you started the timer with a click, which browsers require before playing sound. The alarm rings for up to a minute or until you press Stop alarm.
How do I set a 5 minute timer?
Tap the 5 min preset and press Start. You can also type 5 into the time box and press Enter.
Can I share a countdown to an event?
Yes. Choose Countdown to a date, enter the event, date, time and time zone, and click Copy link.
Does the countdown work across time zones?
Yes. The target is stored with its time zone, and each visitor's counter shows the time left to that exact moment.
How precise is the stopwatch?
It shows hundredths of a second and uses your device's clock. For laps, the fastest lap is shown in green and the slowest in red once you have three or more.
Why doesn't it ring when my phone is locked?
Phone browsers usually pause web pages while the screen is locked. Keep the screen on, or use your phone's built-in alarm for important reminders.
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