The bottom line. The most important principle to keep in mind is this: It's okay to change a job title on your resume if it helps recruiters understand what you actually did. On the other hand, if you're just trying to make your job sound relevant or impressive than it actually was, don't do it.
Can I change my job title on resume?
If your official job title does not align with the work you are doing you can change it. There is no standardized list of job titles. Some job titles are company specific and do not match the titles that the industry uses so when you are applying for jobs you may need to change some of your job titles in your resume.
Does title matter on resume?
Your job titles on your resume are important. They help relay to employers your roles and responsibilities. Listing your job titles can also help to show professional progression!