Unless specifically stated otherwise, you should always send your CV as a PDF file. The PDF format ensures that your CV’s layout and formatting stay consistent, so if the hiring manager opens it on a different device or software, all your design efforts will be intact. PDF files also pass most applicant tracking systems out there, so you won’t have a reason to worry about the ATS. However, if a company requests that you send your CV as a Word document, it’s probably because their ATS is older and can’t read PDFs. In that case, always stick to the instructions in the job ad and save your CV appropriately.