PKPASS Viewer opens Apple Wallet .pkpass and .pkpasses files in any browser, so you can see a boarding pass, ticket or store card on Android, Windows, Linux or Mac. It shows the pass fields, images and a scannable barcode (QR, PDF417, Aztec, Code 128) and can save the pass as a PNG.
The site states the file is read on your device and not uploaded. Viewing and PNG saving are free with no account. PDF export for printing is paid: a $4.90 one-time Trip Pass for 30 days, or Pro at $6.90 a month or $39 a year.
Boarding passes and tickets often arrive as .pkpass files, which only open in Apple Wallet. On Android or Windows there was no simple way to see the barcode or print the pass without installing an app, so I built a viewer that works in any browser and keeps the file on your device.