Save the parcel label where you can find it again
Open the order or postage confirmation and download the label for that order. Where the service offers a choice, choose the full A4 version for your household printer or the thermal label version for the label stock you have. A file with a small postage area and instructions elsewhere on the page will retain that page layout when you print it.
In Safari, open the PDF, tap the share action and choose Save to Files. If your iPhone shows the page menu first, open it to find Share. Pick a folder and name the file with the order reference or another identifier you can check at the packing desk. From an email attachment, open the attached PDF and look for Save to Files in its share menu. A button labelled View label may open a browser page first, so wait until you can see the actual PDF before saving.
Open the saved file in Files and check the recipient, the page with the postage label and whether the page also contains instructions or a receipt. Keep the original PDF for any reprint. The download retains its layout and avoids the resolution and cropping changes that a screenshot can introduce.
| What you have | Where to start | What to check in the preview |
|---|---|---|
| AirPrint household printer with A4 paper | PDF’s Print action | A4 selected, correct page and complete label |
| AirPrint parcel printer | PDF’s Print action | Supported paper size for the loaded label roll |
| MUNBYN RW403B | File import inside Munbyn Print | RW403B selected, correct size and complete barcode |
| Carrier code for shop printing | The carrier’s drop-off instructions | Code is accessible for the shop or locker to scan |
Use the iPhone’s Print action for AirPrint
- Connect the iPhone and AirPrint printer to the same network. Wake the printer and load the stock it supports.
- Open the PDF and find Print in the share or action menu. If the source app does not offer a print action, open the saved PDF in Files and try from there.
- Tap Printer, select the correct device, then choose one copy and the page containing the label. Check the paper size where the print dialogue offers a choice.
- Compare the print preview with the original. Confirm the whole label fits and the preview has no unwanted second page. Tap Print when ready.
AirPrint can serve both an A4 printer and some dedicated label models. Brother lists AirPrint for its wide QL-1110NWBc, for example, and specifies compatible DK stock for the printer. Choose the paper option for the roll you actually loaded. A printer name appearing on the phone confirms discovery. The preview and loaded media still determine what fits.
If you sent the wrong page, open the iPhone’s app switcher while the job is active and check Print Centre. Cancel the job if it is still pending, then reopen the PDF and choose the correct page. Some printers may have already begun printing by the time you see the queue.
Import the PDF into a Bluetooth printer app
For the MUNBYN RW403B, install Munbyn Print from the App Store. Turn on the printer and Bluetooth, then allow Bluetooth access when the app requests it. In the app, select the four-inch printer category and choose RW403B. A Bluetooth app connection keeps the file selection and paper settings within that app.
Open File & Import, select File, then choose the saved PDF. MUNBYN says the shortcut can be added through More Shortcuts when it is absent from the home screen. Preview the correct page, select the matching label dimensions and send one copy. This file picker route is also useful when a carrier app’s share sheet has no MUNBYN shortcut.
Open-format labels with app printing
MUNBYN RealWriter RW403B label printer, white
A practical starting point for a dedicated parcel-label position using compatible open-format direct thermal stock. Choose USB for the supported desktop route or follow MUNBYN’s current phone-app instructions for Bluetooth printing.
Keep in mind. Bluetooth needs the supported application and file workflow. It does not establish Wi-Fi or AirPrint support. Leave room for the fanfold stack or an appropriate external roll holder.
- 4 × 6 inch label workflows
- USB / Bluetooth app printing
- Open-format direct thermal media
Match the PDF page, the loaded label and the paper setting
A 4×6-inch label measures 101.6 × 152.4 mm. Some postage systems use 100 × 150 mm, and dedicated printers may list their own sizes. Pick the option that matches the loaded stock and the carrier’s output. If the barcode is already close to an edge, check the entire preview carefully before assuming a similar size will work.
When a full A4 page is fitted onto a four-inch label, any small postage region on the original page shrinks along with it. Return to the carrier or marketplace to generate the thermal format where available. If your carrier supports the layout you have and your print app offers a crop tool, preview the complete postage region with its margins before printing. Use the carrier’s A4 workflow if the app cannot produce an intact label.
Find the cause of a missing printer or bad preview
The AirPrint printer is missing. Confirm the exact model supports AirPrint and that the printer is awake and on the same network as your phone. If you joined a guest network, check whether it allows devices to see each other. Reopen the PDF after confirming the connection and search for the printer again.
Munbyn Print cannot find the RW403B. Confirm it has power and check Settings → Privacy & Security → Bluetooth for the app’s access. Return to the app and search in the correct printer category. If a previous print is still pending, check the device status before submitting another.
The printer is available but the preview is wrong. Start with the original PDF. Compare its page layout with your paper setting, check orientation and confirm the label and barcode are fully within the printable area. Where the stock moves by an incorrect length or skips labels, use the printer’s media setup instructions. Changing the file layout cannot correct the way stock advances.
Check one label against its order before sticking it on
Make sure the recipient and order reference match the parcel, and inspect the whole barcode and the clear space around it. If you opened several files on your phone, close each one after you have matched its label to its parcel. This makes it easier to resume without repeating the last print.
A label for a different order needs to be replaced with the correct one. Reopen the original file when you need a fresh copy for the same parcel. Once the print is correct, follow the carrier’s placement instructions and keep the barcode flat.
Apple and printer manufacturer instructions
Checked in November 2026.
Common questions
How do I print an emailed postage PDF from my iPhone?
Open the attachment and use its share or action menu to find Print for AirPrint. If your printer uses a vendor app, save the PDF to Files and use that app’s file import. Check the order and page number before printing.
Can I print to a Bluetooth thermal printer through AirPrint?
AirPrint uses a compatible printer and a network connection. For the MUNBYN RW403B, pair and print inside Munbyn Print. Look for AirPrint in the specification of the exact model if you want the iPhone’s built-in Print action.
Where do my downloaded postage labels go on iPhone?
Open Files and look in Downloads or the folder you chose when saving. If Safari is still open, its downloads control can also take you to the file. When saving several labels, use filenames that help you match them to orders.
Why can I select my printer but only see A4 paper?
The available sizes depend on the printer, its connection and the media it reports. Confirm that the model accepts the label stock and that the correct media is loaded. If a suitable label size is unavailable, use a supported app or print the carrier’s A4 version on A4.
Can I print a drop-off QR code and stick it on the parcel?
Follow the instructions for that code. If the service says the shop or locker will scan it to produce the postage label, keep the code available to show at drop-off. A code for that workflow and a completed address label serve different purposes.