---
title: 'Print from a tablet or phone'
description: 'Connect a tablet or phone to the QZ Tray on your computer so you can print receipts, labels and documents from it.'
url: 'https://repender.nl/docs/integrations/print-from-tablet'
last_updated: '2026-11-10'
---

> Docs index: https://repender.nl/docs/llms.txt · MCP: https://repender.nl/docs/mcp · Skill: https://repender.nl/docs/skill.md

# Print from a tablet or phone

Some shops run their POS on a tablet or phone. QZ Tray itself always runs on a computer, a Mac or a PC that your printer is connected to. The tablet or phone connects to that computer over your Wi-Fi.

This is a technical setup. It works best if you are comfortable with a command line, or if someone who looks after your computers does it. Prefer not to do it yourself? [Contact support](https://repender.nl/docs/support.md), and support can help you.

## What you need

- The tablet or phone and the computer on the same Wi-Fi network.
- [QZ Tray](https://repender.nl/docs/integrations/instant-printing.md) installed on the computer, with the printer set up.
- Printing from that computer already working. Test this first, so you know the printer itself is fine before you add the network.

## 1. Find the computer's IP address

The tablet or phone connects to the computer's local Wi-Fi IP address, for example `10.20.2.88`. This must be the local address of the computer on your Wi-Fi, not a public IP address or a domain. Look it up in the Wi-Fi settings of the computer.

Some routers hand out a new IP address from time to time. If printing from the tablet or phone suddenly stops, a changed IP address is the first thing to check. Repeat the steps below with the new address.

## 2. Create a certificate for that address

QZ Tray's certificate only works for `localhost`. Create a new one that covers the IP address and `localhost` together. Always include both, so printing from the computer itself keeps working.

**macOS**

1. Quit QZ Tray completely: right-click the QZ Tray icon and choose **Quit**. Closing the window is not enough.

2. Open **Terminal**.

3. Run this command, with your own IP address instead of `10.20.2.88`:

   ```bash
   sudo "/Applications/QZ Tray.app/Contents/MacOS/QZ Tray" certgen --hosts "10.20.2.88,localhost"
   ```

4. Enter the computer's password when asked. QZ Tray needs admin rights to update its files.

5. Start QZ Tray again.

**Windows**

1. Quit QZ Tray completely: right-click the QZ Tray icon in the system tray and choose **Exit**.

2. Open **Command Prompt** as administrator.

3. Run this command, with your own IP address instead of `10.20.2.88`:

   ```text
   "C:\Program Files\QZ Tray\qz-tray.exe" certgen --hosts "10.20.2.88,localhost"
   ```

4. Start QZ Tray again.

## 3. Get the certificate to the tablet or phone

The command creates a file called `root-ca.crt` in the QZ Tray folder. It is usually here:

- **macOS**: `/Applications/QZ Tray.app/Contents/Resources/root-ca.crt`
- **Windows**: `C:\Program Files\QZ Tray\root-ca.crt`

The exact path can differ a little per installation. If it is not there, search the QZ Tray folder for `root-ca.crt`. Then get the file onto the tablet or phone, for example by email, a USB cable or a cloud drive.

## 4. Trust the certificate on the tablet or phone

The tablet or phone must trust the certificate. Otherwise its browser refuses the secure connection to QZ Tray.

**Android**

1. Open **Settings**, then **Security**. On some devices it is under **Security**, then **Encryption & credentials**.
2. Choose **Install a certificate**, then **CA certificate**.
3. Confirm the warning about installing a CA certificate.
4. Select `root-ca.crt`.
5. Close the browser you use for the POS completely and open it again.

The menu names differ a little per Android version and brand, but it is always under the security settings.

**iPhone and iPad**

1. Open `root-ca.crt` on the device, for example from the email, from **Files** or from AirDrop. iOS says the profile was downloaded.
2. Open **Settings**. At the top you see **Profile Downloaded**. Tap it, then tap **Install** and enter your passcode.
3. Go to **Settings**, then **General**, then **About**, then **Certificate Trust Settings**.
4. Under **Enable full trust for root certificates**, switch on the certificate you just installed.
5. Close the browser you use for the POS completely and open it again.

Step 4 is easy to miss. Without it, iOS installs the certificate but does not trust it.

## 5. Connect to the computer

On the tablet or phone, open **Settings**, then [Integrations](https://repender.nl/dashboard/integrations), and find the QZ Tray card. Click **Advanced settings**, enter the computer's IP address as the host and click **Connect**.

The **Advanced settings** link only shows while QZ Tray is not connected. If you do not see it, the browser is already connected, probably to `localhost`. Disconnect first and the link appears.

## If it stops working

Print from the computer itself first. That tells you where the problem is.

- **Printing from the computer works, from the tablet or phone it does not**: most likely the IP address changed. Check the computer's current IP address against the host on the tablet or phone. If they differ, repeat step 2 with the new address and update the host in step 5.
- **Printing from the computer does not work either**: the problem is QZ Tray or the printer, not the tablet setup. See [troubleshooting](https://repender.nl/docs/integrations/instant-printing.md#troubleshooting).