What's the safest and easiest online fax app to send PDF forms right now?

[bonnynamer31]

Hello all! I rarely ever have to fax anything, but a government office is requiring me to submit a signed form via fax tomorrow. Since I don't want to buy extra hardware or sign up for an expensive monthly plan, I'm looking for a trustworthy online platform or mobile app. Has anyone here used a good digital fax service lately that keeps documents secure and gets the job done quickly?