Does the Post Office print shipping labels at no cost?
At participating locations, yes. Per usps.com, a retail associate scans your Label Broker QR code and prints the label without charging for it, and self-service kiosks handle the same code while you skip the counter line.
Can I just show the label on my phone screen?
A screen works where QR flows exist, like Label Broker at USPS, because the counter does the printing for you. It does not replace the physical label; a barcode on paper still has to ride on the box.
Can a friend print a label I bought here?
Yes. Use the Email Label button after checkout, or forward the downloaded PDF yourself. The file prints identically anywhere and nothing about it is tied to your device.
Where can I print if no Post Office is nearby?
Anywhere documents print: libraries, office-supply and shipping stores, a workplace machine. Fees vary by location and tend to be modest, but we will not quote a figure we cannot check, so ask the desk first.