I’ve been in the same situation and found SignOnlinePDF
https://signonlinepdf.com/sign/mac/ to be the perfect solution. It lets you sign PDF documents right from your Mac without installing anything — you just upload the file, drag and drop your signature, and download the signed version. The interface is super intuitive, supports trackpad or camera signatures, and even integrates with Google Drive if you need to pull files from the cloud. I’ve used it for work contracts and school forms, and it’s always quick, secure, and stress-free.