What is trustd on Mac?
By Junaid, maker of Taskglass · Last reviewed
Checks that security certificates are valid, for websites, apps and secure connections.
trustd evaluates trust in certificates for every process on the Mac. When an app makes a secure (HTTPS) connection or checks a signature, trustd verifies the certificate chain and may check online whether a certificate has been revoked. It's busier when lots of secure connections are being made.
- Category
- Security
- Made by
- Apple
- Safe to quit:
- With care
Shown in Activity Monitor as trustd
Why is trustd using so much CPU or memory?
- Lots of new secure connections (browsers, sync apps, updates)
- Slow or blocked access to certificate-checking servers
- VPNs, proxies or security software that inspect HTTPS traffic
What to do
- 1Wait; spikes during heavy browsing or updates are normal
- 2Temporarily disable VPN or HTTPS-inspecting tools to compare
- 3Restart your Mac
Safe to quit? With care.
macOS relaunches it; secure connections may fail for a moment.
Related processes
Part of the Taskglass Process Library