You can download the certified logo for any CompTIA certifications you hold. Simply log in to your CompTIA certification account, click on the Certifications tab and click the Logo link under Downloads next to the corresponding certification.
You will be prompted to read through and agree to the usage guidelines before you can access your logo(s).
Certification logos for LinkedIn
To add CompTIA certification logos to your LinkedIn profile, go to the Add your CompTIA certifications to your LinkedIn profile page and follow the directions listed.