Comment by dspillett

> What is the benefit of using a QR code over just printing and storing the document itself in a human-readable format?

Easier reading back. You don't want to be typing your private key in, and while scanning + OCR might be pretty reliable unless you are daft about font and text size choices getting text direct from the QR code on your phone (or direct into a PC/laptop if you have a scanner that perhaps types the content by pretending to be a USB keyboard), feels to me like it would be more convenient.

You can store a 2048-bit RSA private key in standard text form in a QR code, so after scanning to clipboard all you have to do is paste the text into an appropriate file, or again using the scan->HID option that is slightly more direct.

For longer keys you will need multiple QR codes, of course, and a very slightly more convoluted method. I have a couple of keys, SSH private keys and the master key for a keepass store (which is also on a USB token I carry), printed as QR codes stored in a secure place in this manner.

It looks like this tool does not allow for direct input from scanning the QR code(s) in the manner I've just described, as the description says it includes metadata for reassembly of larger data removing the simplest case for small data in favour of making larger data more convenient/robust.