YouTube Milliseconds Timer

Millisecond timestamps, interval timer A→B, one-click copy, and detailed watch time stats with weekly chart and calendar

YouTube Milliseconds Timer adds millisecond precision to YouTube's video player and a full set of tools for anyone who needs to work with video time precisely — editors, researchers, educators, content creators, and sport analysts. FEATURES Millisecond-accurate timestamps Displays time in M:SS.mmm format (e.g. 1:23.456) directly in the YouTube player. No overlays, no clutter — replaces the native timestamp seamlessly. Toggle milliseconds on/off from the popup at any time. One-click timestamp copy A small copy button appears next to the time display. Click it to instantly copy the exact timestamp to your clipboard — great for notes, subtitles, video editing, or sharing precise moments. Interval Timer (A → B) Mark two points on any video and instantly see the exact time difference between them, down to the millisecond. Press [ to set point A, ] to set point B — or use the A/B buttons in the player controls. The result appears in a floating badge above the controls. Copy the interval delta with one click. Visual markers on the progress bar show your selected range. Watch time statistics Track your YouTube viewing habits with a full stats dashboard in the popup: • Total watch time across all sessions • Today's watch time • Daily average — calculated over 7 days, 30 days, or all time • 7-day bar chart showing your recent activity • Monthly calendar heatmap with color-coded intensity per day Navigate back through previous months to see historical data. PRIVACY No accounts. No tracking. No data leaves your device. All stats are stored locally in your browser using Chrome's built-in storage. The extension never accesses the clipboard without an explicit user action.