IMGto3D (https://www.imgto3d.ai/fr) generates 3D objects from an image in png or jpg format up to 1MB.

Generation in 30s at 1 min. Export in obj. format

Free, without an account and unlimited (renewable use quota every 10 generations approximately).

Test from Wikimedia commons images:

• https://commons.wikimedia.org/wiki/File:MG_PA_6_Race.1300_cm%C2%B3,_Bj._1936(2008-06-28_Sp).jpg
• https://commons.wikimedia.org/wiki/File:Malabar_pied_hornbill_(Anthracoceros_coronatus)_male.jpg
• https://commons.wikimedia.org/wiki/File:Portrait_of_Yi_Haeung_(National_Museum_of_Korea).jpg
• https://commons.wikimedia.org/wiki/File:011_The_lion_king_Tryggve_in_the_Serengeti_National_Park_Photo_by_Giles_Laurent.jpg