How to Add a Timer to Notion

If your task list, notes, and meeting agenda already live in Notion, a timer in another window is the first thing you bury. An embed keeps the countdown on the same page as the work. That is the only reason to embed: visual proximity. The timer still runs in the browser, still needs the page open, and still obeys autoplay rules.

onetimer exposes dedicated embed routes — /embed/timer, /embed/alarm, /embed/clock, /embed/countdown — generated from the Share section on the matching module. Notion wants a URL. Other sites can take the iframe HTML from the Embed Code Generator (show buttons, size preset, copy URL or copy HTML). Prefer a dedicated page over an embed? The fullscreen timer runs in its own tab.

1. Open your Notion page and type /embed (or click + and choose Embed).
2. Paste one of the onetimer embed URLs below. Preset timer links are /embed/timer URLs with duration, title, appearance, and autostart query params. The clock preset is /embed/clock.
3. Resize the block so the digits and Start/Pause/Reset controls fit. Tight blocks hide buttons even when the URL has buttons=1.
4. Click Start inside the embed (or rely on autostart if the preset sets it and Notion allowed the iframe to load). Keep the Notion page open while it runs.
5. If there is no sound at zero, click inside the embed once — browsers block autoplay until you interact with that frame. Enable Sound appears when the page still needs a gesture.

Visit the main Timer page. Click Set Timer, choose Duration (or Date/Time), title, sound, repeat, and post-zero behavior (stop, auto-restart, or count up). Start once if you want it in Recently Used.

1. On /timer, use the toolbar control Jump to share section (or scroll to Share).
2. Click Embed. The Embed Code Generator opens with Embed URL and HTML code. The URL path is /embed/timer plus your settings as query parameters.
3. Copy URL for Notion. Copy HTML Code for a generic iframe (include allow="autoplay" as the generator does).
4. Repeat from /alarm for /embed/alarm or from World Clock for /embed/clock. Date-style event pages use /countdown and /embed/countdown — that is days-to-an-event, not a 25-minute focus block.

The generator also sets appearance query params (buttons, font, theme, night mode, font size) so the iframe matches a Notion column. Size presets in the dialog (for example 300×250 or 475×250) are for HTML embeds on other sites; in Notion you resize the block after paste. Leave Show control buttons on unless the block is a tiny clock with no Start affordance.

• The Notion page (and the embed iframe) must stay open. Navigating away, closing the tab, or collapsing the laptop stops the countdown the same way /timer does.
• Sleep pauses timers. A docked Notion wiki on a sleeping display will not ring.
• Autoplay: even with autostart=1 on /embed/timer, many browsers mute the iframe until a click inside it. Plan to tap Start in the block once per session.
• This is not Pomodoro. A timer embed is one duration. For Focus/break cycles, open /pomodoro in a tab, or place a 25-minute embed next to a 5-minute embed and start them yourself.
• Recently Used and Settings on /timer are your browser's local data. The embed URL is the portable copy of that configuration; Notion does not read your localStorage.

Build and copy embeds from Timer (duration countdown) — this is the usual Notion block.

Repeating study or 20-20-20 cycles belong on Pomodoro, not in a single embed URL.

Days until a launch or holiday: date countdown and its /embed/countdown route.

Named segment timers beside slides: countdown timer for PowerPoint (second screen or tab — not a Notion embed).