It may not happen often, but it’s sometimes necessary to send a fax. But you don’t need a fax machine to do it: You can send a fax right from your smartphone or tablet if you download a fax app. Here are some of the best fax apps available for Android and iOS devices.

eFax

This company is one of the most well-known internet fax services. Its mobile offerings can send faxes as PDF files from your device and integrate with your contacts for easy access. You can attach documents for faxing from Dropbox, Box, iCloud, and other server-side storage repositories. You can also add notes or your electronic signature before submission. The company also allows you to receive faxes at an assigned number and view them in the app.

  • 14-day free trial

  • Send faxes as PDF files from your device

  • Supports cloud services like Dropbox and Box

  • Doesn’t offer as much value as other services

  • Can be pricey

A free 14-day trial lets you sample eFax’s services. After that, you’re billed monthly, depending on the plan you chose. For a flat fee of around $16 a month, eFax Plus allows you to send and receive 170 pages, after which you’re charged 10 cents for each additional page. If you plan to fax more frequently, the eFax Pro plan may be worth looking into.

FaxFile

FaxFile lets you send files or photos from your phone or tablet to fax machines in the U.S., Canada, and some international locations. Your files are transferred to the FaxFile servers. There, the file is converted to the proper format and sent to your destination as a paper fax.

  • Supports PNG, JPG, PDF, and Word files

  • Doesn’t require an account or subscription

  • Efficient and simple to use

  • Works on a credit system

  • Can’t receive faxes

The app supports PDF and Word documents along with PNG and JPG images, such as those taken by your device’s camera.

No account or subscription is required to transmit messages through FaxFile. However, you must purchase credits. The prices vary based on whether you send a fax to a domestic location or internationally.

You cannot receive faxes with the current version of the app.

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PC-FAX.com FreeFax

The PC-FAX.com FreeFax app lets you send faxes without registering or subscribing to anything. You can take a photo of your document and fax it from your phone. The app lets you transmit email and certain email attachments as well. You can compose a new fax message in the app and send it, or transmit documents from Dropbox and Google Drive.

  • No subscription required

  • Send emails and certain attachments

  • Can compose a fax message in the app

  • Cost varies depending on page number and destination

  • Receiving faxes requires buying a host number

FreeFax allows you to send one page per day for free to approximately 50 countries, including the U.S., Canada, Australia, China, Russia, Japan, and several European destinations. If you need to send more, there are in-app purchases, and costs vary depending on the zone and number of pages. You can also receive faxes with FreeFax, but only if you register and purchase a host number.

The app provides an interesting service, aside from faxing: It allows you to send real letters using traditional postal mail for a fee.

Genius Fax

Genius Fax is another app that allows you to send images and PDF files to a fax machine, with support for over 40 destination countries. It also provides real-time delivery confirmation and the ability to purchase your own number to receive fax messages for $3.49 per month.

  • Supports over 40 destination countries

  • Delivery confirmation provided

  • International faxes cost the same as domestic ones

  • Monthly subscription required to receive faxes

  • Can only buy credits in increments of 10

Its pricing structure is based on credits, where one credit equals one page. Each sent page costs $.99, whether it’s domestic or international, and credits can be purchased in increments of one, 10, and up.

iFax

This feature-rich app offers an intuitive, easy-to-navigate interface that can send faxes quickly without creating an account or signing up for anything. iFax supports sending fax messages from PDF attachments. Integrated with Dropbox, Google Drive, and Box, the app allows for customizable cover pages containing your logo and signature.

  • Easy to navigate the interface

  • No account required

  • Numerous reports of users being charged before the free trial ends

The scanner feature lets you crop photos of documents and adjust the brightness and sharpness before sending over a secure transmission using HIPAA-compliant technology. You can pay per fax or through credit packages, which can save some money if you plan to use the app often. There are many purchase options available, and you can earn free credits by referring others to the app.

If you choose to purchase a fax number, you get unlimited inbound faxes sent to your device. U.S. numbers are available free of charge for the first seven days.

iFax also has Apple Watch support for receiving faxes.

Fax Burner

While it’s not the most feature-rich option on the list and it’s known to be unreliable and buggy at times, Fax Burner is here for one key reason. You can send up to five pages for free before spending any money. This is a one-time thing. However, it can be useful when you’re in a bind and want to send a fax immediately without digging out your wallet.

  • Send up to five pages for free

  • Create cover sheets within the app

  • Offers free temporary fax numbers

  • Not the most feature-rich option on this list

  • Buggy app

Fax Burner allows you to type a cover sheet in the app and uses your camera or photo library to attach images of documents you need to fax. You can also sign forms before transmitting the fax.