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← Communication & Background

Periodic Background Sync

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Periodic Background Sync is a web platform capability in the Communication & Background category. Periodically refresh content in the background. Supported in Chromium 80+; not available in Firefox and Safari. Requires a secure context (HTTPS or localhost) and the site to be installed as an app.

Secure contextInstalled app

Permission periodic-background-sync: unknown

Try it

Loading demo…

Code

const status = await navigator.permissions.query({
  name: 'periodic-background-sync',
})
if (status.state === 'granted') {
  const reg = await navigator.serviceWorker.ready
  await reg.periodicSync.register('demo-periodic', {
    minInterval: 24 * 60 * 60 * 1000,
  })
}

Browser support

Chromium
80
Firefox
No
Safari
No

Frequently asked questions

Which browsers support Periodic Background Sync?

Supported in Chromium 80+; not available in Firefox and Safari.

Does Periodic Background Sync require HTTPS?

Yes. Periodic Background Sync needs a secure context, so it only works over HTTPS (or on localhost during development).

What is Periodic Background Sync used for?

Periodically refresh content in the background.

Can I try Periodic Background Sync in my browser?

Yes. shwcs.net runs a live Periodic Background Sync demo that probes your current browser and lets you try the API. Everything runs locally — nothing is sent anywhere.

MDN reference ↗ Specification ↗