Features that give customers control over their data, such as the ability to set how long a fax is stored and the ability to delete old faxes, provide added peace of mind. We examined the privacy and security policies for all the services we tested, and we asked the companies how they secured faxes during transmission and in storage. A strong security policy: In many cases, people need to fax sensitive information, such as phone numbers and even Social Security numbers.

We preferred those that could fax more formats, so you don’t have to convert files before sending them. A variety of supported file formats: Some fax services support only one or two file types, such as PDF and TIFF.We appreciated services that made uploading a file as simple as dragging and dropping or connecting a cloud storage account, as well as those that provided cover-page templates and the option to save fax numbers in an address book. User-friendly interface and convenient fax features: Sending a fax should be as easy as sending an email.To test fax receiving, we faxed our top contenders using HP’s fax testing service and faxed twice from a laptop with a fax modem connected to a VoIP line. Fax reliability and quality: For each service we considered, we sent three test faxes to a virtual Kall8 phone number: a one-page PDF, a one-page DOC, and a 25-page PDF.

For professional and HIPAA-compliant use, we focused on options that had straightforward subscription pricing.

Free faxing or low fees: For occasional faxing, we looked for services that let you fax for free or charge no more than a one-time $1 to $2 fee to send a long document.

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