How to Copy a QR Code
To "copy" a QR code usually means either re-downloading the same image file again, or recreating an equivalent code that points to the same destination — scan the original to read its content, then generate a fresh code with that same data.
If you generated the original yourself and just need another copy of the file, most generators (including this one) support re-downloading with automatic filename numbering, so you don't overwrite the original. If you're starting from someone else's printed code with no access to the source file, scan it first with any phone camera to reveal the encoded content, then paste that same content into a generator to produce your own copy.
There's an important distinction between copying the image file and copying the code's function. Simply screenshotting or saving the image copies the file, but if you need it in a different format (say, converting a PNG into a scalable SVG for print), you'll need the original content re-encoded from scratch, since a raster image can't be losslessly converted back into a true vector file.
This is one more reason it's worth keeping a record of what a QR code actually encodes, the URL, vCard details, or WiFi credentials, separate from just the image file itself. With the underlying content saved somewhere, generating a fresh copy in any format or style takes seconds; without it, you're stuck scanning the physical code just to recover what it says before you can recreate it.
For a styled or branded QR code (custom colors, dot shapes, a logo), copying just the plain content isn't quite enough to get an identical result, the styling choices themselves also need to be reapplied in the generator. Noting down both the encoded content and the style settings used avoids having to reconstruct the exact look from scratch later.