Millisecond display for browser timing
Switch between a millisecond countdown and stopwatch. The display updates at animation-frame speed and keeps elapsed time from a high-resolution browser clock while the page is active.
High-resolution display
Millisecond Timer
A browser-based millisecond timer and stopwatch with high-resolution display, custom presets and fullscreen mode.
00:00:00.000
Quick presets
ⓘ Browser timers are not real-time instruments. Very short intervals can be delayed by the browser or operating system, especially in background tabs.
Know the accuracy limits
Browsers and operating systems can delay callbacks, especially for very small values or background tabs. Use this tool for convenient on-screen timing, not laboratory or safety-critical measurement.
FAQ
Can a browser guarantee an exact 1 millisecond alarm?
No. Browser and operating-system scheduling can delay very short timers. The millisecond display is useful, but it should not be treated as a real-time measurement instrument.
Does the millisecond stopwatch use a high-resolution clock?
While the page is active it uses the browser’s high-resolution timing APIs for smooth elapsed-time display.