The file format of the QR Code image will depend on the type of design of the QR Code and your own requirements. Please see the following cases:
Case 1: QR Code has no design, standard design, or custom with logo
In this case, you can export the QR Code image in both raster (PNG, JPG) and vector image formats (EPS, PS, SVG, PDF).
If the target destination of the QR Code is web (email, website, mobile app, etc.), then you can export the QR Code in raster format i.e. PNG or JPG. Note that raster can also work with small-size print jobs such as business cards. In raster formats, you can provide the image size in pixels or physical dimensions (inches, mm, cm) assuming 300 DPI.
If the target destination is print (especially prints larger than A4), then export the image in vector format (EPS, PS, SVG, and PDF). Popular image editors such as Adobe Illustrator, Adobe Photoshop, Corel Draw, and Sketch 3 (Mac) can import these vector image formats.
The size of the vector image can be increased or decreased infinitely without compromising on resolution.
Case 2: QR Code has custom background design
In this case, you can export the image with QR Code in raster format only (PNG, JPG). The image size will be the size of the background image imported.
If you still have questions related to this topic, feel free to reach out to our customer relations team at firstname.lastname@example.org.