Edit 4/3/19: I have found a workaround. This is tested on Chrome for Mac 73.0.3686.86 64-bit, platform: macOS 10.14.4:
- Open a new TextEdit document.
- In TextEdit, click Format | Make Plain Text.
- Arrange windows so that the TextEdit window and the Chrome window are both visible.
- In Chrome, click the icon to the left of the URL in the address bar.
- In the dropdown list, click Certificate.
- Hold down Option and drag from the large certificate icon to the body of the TextEdit document. Note: If you did not follow the steps above in exactly the order stated, you may need to first single-click within the Chrome window so that TextEdit doesn't become hidden when you Option-click.
- Save the TextEdit document with a .pem extension.
If you don't hold down Option when you drag, then you will instead get the certificate contents in human-readable form, which can also be handy.
(Edited 2/24/19: @RichardTopchiy is correct, this no longer works. Testing on Chrome 72.0.3626.119 64-bit. I don't know of any workaround at the present.)
(Edited 2/10/17: I have added a more up-to-date answer in a comment: How to Export Certificate from Chrome on a Mac?)
- Click the icon to the left of the URL.
- In the box that pops up, click the Connection tab.
- Click the Certificate Information link.
- A box pops up showing information about the certificate. Drag the large certificate icon to a Finder window. A .cer file will be created in the location you drag it to.
This is based on Chrome 42.0.2311.135 (64-bit) for Mac.
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