Manually Installing the Root Certificate on macOS


Product Version 1.0.0 and above
OS macOS


To capture secure traffic (HTTPS), Fiddler Everywhere needs to install a root trust certificate, called DO_NOT_TRUST_FiddlerRoot, in the Keychain Access application. How can I install the trust certificate automatically or manually?


It is recommended that you install the Fiddler Everywhere root certificate on macOS automatically. For the step-by-step guide, refer to the First Steps with Fiddler Everywhere on macOS article.

If the automatic installation and enabling of the trust certificate do not work, you can manually install the trust certificate to your keychain:

  1. Open Fiddler Everywhere and go to Settings > HTTPS_ and expand the Advanced Settings menu.

  2. Use the Export root certificate(DER/Binary format) option from the drop-down menu. As a result, the FiddlerRootCertificate.crt file will be created in the Desktop folder.

  3. Go to the Desktop folder and click FiddlerRootCertificate.crt. The Keychain Access application starts and opens the Certificates section.

  4. Double-click the DO_NOT_TRUST_FiddlerRoot certificate to open it.

  5. Expand the Trust section and choose Always Trust in the When using this certificate drop-down. The Fiddler root certificate is now installed and trusted. notification appears.

    Manually trusting the certificate

  6. Open Fiddler Everywhere and start capturing secure traffic.