Hi @BorisGodizzi,
While the setting that @MFrankJohnson is referring to requires a domain that hosts your HubSpot content, there is a way to see your email in a webpage format on the free tool. After you send your email, you can click on the preview pane of the email and view it in a new window, which will include a unique url for your email. This url can be shared and will lead to your email.
Thank you,
Jenny