Originally published on cert-depot.com . Free, open-source self-signed certificate generator — no signup, keys never stored. How to Trust a Self-Signed Certificate on macOS Add your certificate to the macOS System keychain so Safari, Chrome, curl, and most other tools trust it. macOS uses a unified keychain system that's shared across most applications — Safari, Chrome, curl, git, and many others. Adding your self-signed certificate once usually makes it trusted everywhere (Firefox is an exception; see our Firefox guide ). GUI: Keychain Access Open Keychain Access (Spotlight: Cmd+Space, type "Keychain"). From the menu: File › Import Items . Select your .pem or .crt file. When asked which keychain, choose System (requires admin password). Choose login to trust it only for your user. Find the imported certificate, double-click it. Expand the Trust section. Change "When using this certificate" to Always Trust . Close the dialog — you'll be prompted for your password to save.…