Remove key file password
You cannot upload a custom certificate with a password-protected key file.
The process for removing the password depends on your operating system. The following examples remove the password from example.com.key.
Linux
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Open a command console. 
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Go to the directory containing the example.com.keyfile.
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Copy the original key. Terminal window cp example.com.key temp.key
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Run the following command (if using an ECDSA certificate, replace rsawithec).Terminal window openssl rsa -in temp.key -out example.com.key
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When prompted in the console window, enter the original key password. 
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Upload the file contents to Cloudflare. 
Windows
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Go to https://indy.fulgan.com/SSL/ ↗ and download the latest version of OpenSSL for your x86 or x86_64 operating system. 
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Open the .zipfile and extract it.
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Select openssl.exe. 
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In the command window that appears, run: Terminal window rsa -in C:\Path\To\example.com.key -out key.pem
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Enter the original key password when prompted by the openssl.exe command window. 
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Upload the contents of the key.pemfile to Cloudflare.
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