18 Hour Timer - Free Online Countdown Timer

18:00:00

18 Hour Timer

Customize Your Timer Experience

Ring Settings:

Outer Ring Color:

Inner Ring Color:

Progress Ring Color:

Progress Shadow Color:

Time Display Settings:

Time Display Color:

Time Display Size (px):

Time Display Shadow Color:

Background Customization

Choose Your Background

Key Features

Visual Progress Tracking

Watch your progress with animated circular rings that fill as time passes

Customizable Design

Personalize colors, backgrounds, and text size to match your preferences

Fullscreen Mode

Maximize focus with distraction-free fullscreen timer display

How to Use the 18 Hour Timer

Set Your Duration: Enter your desired time in the format HH:MM:SS (default is 18:00:00)
Customize Appearance: Choose from 30 background presets or upload your own image
Adjust Colors: Personalize ring colors, text color, and shadow effects
Start Timer: Click the START button to begin your countdown
Stay Focused: Watch the progress ring fill as time passes
Complete Session: Receive audio and visual alerts when time expires

Perfect For

Extended Study Sessions

Long Work Blocks

Project Deadlines

Time Management

Frequently Asked Questions

Can I change the timer duration?

Yes! Enter any time format from seconds (SS), minutes (MM:SS), to hours (HH:MM:SS) in the input field.

Does the timer work when the tab is inactive?

Yes, the timer continues running in the background and will alert you when complete.

How do I stop the alarm sound?

Click anywhere on the timer display or press the START button to stop the alarm.

Are my customizations saved?

Customizations persist during your session but will reset when you refresh the page.