i'm looking for a program which runs on windows and can read/decode qr-codes.

at this state i'm happy for every suggestion, but the more requirements it hits the better:

• must run on windows
• must decode qr-codes
• should be gratis and even better free (FOSS)
• should read qr-codes from webcam
• should read qr-codes from files (png, jpg, pdf, etc.) - the more formats the better.
• may read qr-codes directly from screen
• may read qr-codes directly from other sources like scanners, etc.
• may decode other 1d- & 2d-codes

as a pendant on linux i use QtQR which fulfills at least the "musts" & "shoulds" beside creating qr-codes (which isn't necessary in this case).

I recommend Sharex. It's free & open source.

It can:

• Run on windows / steam
• Reads qr-codes from image files

And so many features that I find it very useful:

• Screen capture region
• Screen recording (video / gif)
• Easy upload captured image to image sharing (e.g imgur)
• Color Picker
• Ruler
• And many other features that I haven't tried
• although it is a bit of a overshoot for just decoding qr-codes (hence not really user-/noob-friendly), it seems to be the best recommendation so far. – DJCrashdummy Oct 9 '18 at 8:53

there is one program i found CodeTwo QR Code Desktop Reader & Generator:

• runs on Windows XP SP3 and up
• is only gratis but not free (FOSS) - but anyhow seems to be also free for commercial use
• well... i'd say FOSS is preferred, not essential because of lacking alternatives! || i also stumbled across this project, but i don't see any GUI and sadly it also refused to work with my webcam. :-( -- citation from the windows-readme: This version of the package includes *only command line programs*. (The graphical interface is scheduled for a future release) || but thanks for the answer anyway! – DJCrashdummy Jun 8 '18 at 9:17