I use Emacs to do this. Here's how: https://www.masteringemacs.org/article/securely-generating-totp-tokens-emacs https://www.masteringemacs.org/article/securel

I use Emacs to do this. Here's how: https://www.masteringemacs.org/article/securely-generating-totp-tokens-emacs https://www.masteringemacs.org/article/securely-generating-t... I securely store the master key using Emacs's builtin support for GPG and then decrypt the file on-the-fly to generate a TOTP token, which I select from a dropdown. All-in-all, I can have a key in seconds and paste it anywhere.