Since there are no "Green Pass apps" available in Austria, the only option is to show the relevant certificate on paper or in PDF format on your smartphone. Due to the fact that these are issued in the impractical DIN A4 format, the documents are a bit bulky "on the go". With a few small but legal tricks, the certificate even fits into the driver's license compartment that is in many wallets. In addition to a computer, all you need is Acrobat Reader, a printer, scissors and, if desired, a laminator with suitable foil. To print out the recovery and vaccination certificate in the appropriate format, all you have to do is set the scaling in the print menu before clicking on "Print". How to get the EU certificate for vaccinated, recovered and tested people (Green Pass) and where to get the mobile signature if you don't have one yet is explained in detail in this Aviation Direct travel tips article. The scaling values ​​that result in easily readable output sizes that are more suitable for everyday use without distortion are given below: Output format Scaling to be set DIN A5 71 percent DIN A6 50 percent "Driver's license compartment" 40 percent Since this is only a reduced printout and not a manipulation of the certificate, this is completely legal. The QR codes are also easy to read in the "small sizes" if laser printers are used. With inkjet printers, which can be vulnerable when outputting QR and barcodes, you should check whether the code is readable after printing using a smartphone using a QR/barcode app. With laser printers, the output is exact and therefore this intermediate step is unnecessary. After you have the reduced printout in your hands, simply