# Printing from the browser: permissions and certificates **Symptom:** the POS runs in a browser and can't reach the printer — the scan finds nothing, or the same printer prints from the desktop app but not from the browser tab. ## Allow local network access[​](#allow-local-network-access "Direct link to Allow local network access") Chrome and Edge ask permission before a website may talk to a device on your network. If that prompt was dismissed, every attempt fails silently. Click the icon at the left of the address bar → **Site settings** → set **Local network** to **Allow**, then reload the page and scan again. ## Mixed content[​](#mixed-content "Direct link to Mixed content") A POS served over `https://` cannot open a plain `http://` connection to a printer. Chrome and Edge allow it once you've granted local network access; other browsers block it outright. If your store runs on HTTPS and the printer only speaks HTTP, use the desktop app. ## The printer's certificate[​](#the-printers-certificate "Direct link to The printer's certificate") Printers secure themselves with their own certificate, which no browser trusts by default — the connection fails before it starts. Open `https://printer-ip` in the same browser once, accept the warning, and go back to the POS. You'll need to do this on each computer. The desktop app doesn't have this problem: it accepts the printer's certificate itself, which is why the same printer works there and not in the tab. ## Safari and Firefox[​](#safari-and-firefox "Direct link to Safari and Firefox") Neither has any of these routes. They have no local network permission to grant, and no support for USB or Bluetooth printers from a web page. On those browsers use a Wi-Fi printer that matches your store's HTTP or HTTPS, or use the desktop app. ## Still stuck?[​](#still-stuck "Direct link to Still stuck?") Use **Copy setup report** on the trouble screen and paste it into your message — it records which browser and which lane were tried. [Discord Community](https://wcpos.com/discord)