Envelopes print misaligned or blank in PitneyShip or PitneyShip Pro on a Mac

There are several possible solutions if envelopes are printing misaligned or blank on a Mac.
Products affected: PitneyShip™, PitneyShip™ Pro


When printing envelopes in PitneyShip or PitneyShip Pro on a Mac, the envelopes print misaligned or blank.


Solution 1: Verify that the correct envelope settings are selected

  1. In PitneyShip or PitneyShip Pro, select Settings > Stamp Options.
  2. Change the Envelope Size to the type of envelope you are using.
  3. Change Printer to the printer you are using.
  4. Change the Printer Tray to the tray being used for envelopes.
  5. Select Advanced Printer Settings for Envelopes and choose the correct options for your printer.
  6. Go back to the Print Envelopes screen and select Test Print.
  7. Select the printer in question.
  8. Select Print Stamps.

Solution 2: Try changing the envelope size to #9, even if you are using a #10 envelope

  1. From the Print Envelopes screen, select #9 under Envelope Size.
  2. (Optional) If this resolves the issue, you can change the default envelope size to #9:
    1. Go to Settings > Stamp Options.
    2. Select Envelope #9 under Envelope Size.

Solution 3: Verify that the correct paper size is selected on your printer

  1. Select the Apple icon.
  2. Select System Preferences.
  3. Open Printers & Scanners.
  4. Select the envelope printer.
  5. From the Default paper size menu, select Envelope #10.
  6. Return to PitneyShip or PitneyShip Pro and try again.

Before you continue

Some of these troubleshooting steps require you to make changes to your printer’s default settings, which may affect other programs. If you wish to avoid changing settings back and forth between PitneyShip or PitneyShip Pro and other programs, we recommend you first install a duplicate instance of your printer by creating custom printer settings dedicated to PitneyShip or PitneyShip Pro.

Solution 4: Change the paper size in CUPS printer manager

  1. Open Safari.
  2. Type http://localhost:631 in the address bar and press Enter.
    • If Web Interface is Disabled appears:
      1. Click the magnifying glass in the upper right.
      2. Type Terminal in the search box, then click the Terminal icon.
      3. Type cupsctl WebInterface=yes and press Enter.
      4. Close the Terminal.
      5. Go back to Safari and try http://localhost:631 again.
  3. If you are asked to enter your Mac user credentials, do so.
  4. Click the Administration tab at the top.
  5. Click Manage Printers.
  6. Click the Administration menu above the printer description and choose Set Printer Defaults.
  7. Change the Media Size to Envelope #10 (it may be named COM-10 depending on your printer model).
  8. Change the Paper Source to the correct printer tray for envelopes
  9. Click Set Default Options.
  10. Return to PitneyShip or PitneyShip Pro and try again.

Solution 5: Update the printer driver

Download and install the latest printer driver for your printer from the printer manufacturer's website.

If the issue is not resolved, please refer to Compatible printers and scales for PitneyShip and PitneyShip Pro.


UPDATED: August 18, 2023