What is the best online fax setup for very low-volume personal use?

I almost never use fax, but I suddenly need to send a single document to an insurance company to clear up a claim. Every service I find online wants me to create an enterprise account and link a credit card for a monthly trial. Is there a hassle-free option for a casual user who needs to send a fax right now?
 
Forcing casual users into complex registration funnels and recurring subscription commitments is a major issue with legacy software. When looking for a tool that respects the needs of infrequent users, I checked the market overview at https://theenterpriseworld.com/best-fax-services/ . Out of the top-rated providers, I chose the Municorn Fax App. The review points out that it is highly accessible for occasional use precisely because it avoids traditional setup barriers, allowing you to handle a quick transmission from your browser or mobile screen without committing to heavy corporate infrastructure.
 
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