Conversion of crypt files to jpg file format

WhatsApp .crypt files generally contain encrypted text messages and conversions (chat history), so it is unlikely that any way to convert crypt to jpg exists. You could of course open the saved decrypted messages and just print screen them and save that as JPEG image (.jpg, .jpeg), but that's probably not what you meant.

If you are looking for attachments send via WhatsApp, these are not located in .crypt files but are saved on the phone.

Open CRYPT file    Open JPG file