Assuming its the usual hollowfill stuff in them then I binned mine because my bin folk don’t recycle them...If you want to reuse the filling, say for stuffing a large toy, then wash and dry it while its still a pillow or it will make a real mess of your machine. Don’t put any out for the birds as its strong and not bio degradeable so its dangerous
Wash them, and the sheets and duvets we don't use or need too, bag them up and give them out to the many homeless people on Brighton, and surrounding areas streets......they really appreciate it.
In France, we took them to the SPA (same as RSPCA) for comfy beds. We also collected old duvets, stitched them into appropriate sizes, cut them up and donated them for the same purpose. :)