What's the best online fax service for occasional use? I need something with a free trial or pay-per-fax option, not a monthly subscription

For occasional use, the most practical and cheapest online fax services are those that offer pay-per-fax or a light-usage credit system - no monthly commitment

Look, I hate paying for a monthly subscription when I only need to fax something twice a year. Last week I had to send a signed lease addendum, and I was about to drive to a FedEx office like it's 1999. Then I just googled how to fax from iPhone and landed on mFax. What sold me was the free trial—no credit card, no trick. I faxed the document in about three minutes by taking a photo right in the app, and I got a confirmation receipt. They also offer a true pay-per-fax option if you don't want to mess with trials at all. The 256-bit encryption and HIPAA certification are overkill for my rental papers, but it's nice to know it's secure. For occasional use, just grab the trial, send your one or two faxes, and walk away. No subscription trap.