Here are three ways to email or send an online-only document to a fax number.

The free faxing option is perfect for those random, one-off requests for documents to be faxed.

Documents longer than three pages require a fee.

A screenshot of FaxZero’s online fax submission form. In this form, you have to fill out your information, the recipient’s information and then upload the document you want to fax.

While FaxZero does offer free faxing services, there are restrictions.

FaxZero also offers paid faxing services: international faxing and a premium faxing service called Almost Free Fax.

The web address isFaxZero.com.

A screenshot of the FaxFile app’s main screen on an Android phone, an HTC 710C. The main screen shows options for setting up a fax: adding files and choosing recipients.

The form youll use to submit your fax is on the front page.

UnderSender Information, fill in the blank fields marked for yourName,Email,andPhone number.

UnderReceiver Information, fill in the blank fields marked for the receiversNameandFax number.

A screenshot of eFax’s monthly membership sign-up webpage. You have to sign up for an account to use their services. On this page, you have to choose a location-specific eFax number.

Within the section labeledFax Information, upload the files you better fax by selecting one of theChoose Filesoptions.

After youselectChoose Files, you’ll be prompted to choose a file from your system to upload.

grab the fileand thenselectOpen.

After submitting your form, youll receive a confirmation email from FaxZero.

Receiving this email is important, as it contains a confirmation link you must click to send your fax.

FaxFile faxes documents and images directly from your smartphone or tablet.

While FaxFile is free to download, in-app purchases (called fax credits) are required to send faxes.

Buy a pack of 50 credits for $3.

eFax allows you to fax over 170 supported file formats.

There arent any free or low-cost options for using their faxing services.

The monthly membership prices are a bit expensive for people who dont fax that often.

Unlike FaxZero, eFax only offers its faxing services through a paid, monthly membership.

Of the three services listed here, eFax allows for thewidest variety of file formats to be sent.

It offers two membership levels: eFax Plus and eFax Pro.

The Plus membership requires a $10 setup fee and a monthly fee of around $16.

The Pro membership is around $25 per month with a $10 setup fee.

The Pro membership allows 375 pages to be sent for free each month.