Hey all! I wanted to share my ImageShare web app, which allows you to transfer images from a Nintendo 3DS (or nearly any other device) to a modern device with QR codes or shortlinks. It works in the regular 3DS web browser, no modding or homebrew required.
You can use it to transfer photos and videos from the 3DS, and it doesn't strip out any of the stereoscopic data. Photos copied through ImageShare work in 3DS Wigglegram, you just have to turn off the file filter in the upload form (if your browser supports that), or rename the JPEG file to MPO.
I'm currently working on the next update, so let me know if something is broken or could be improved!