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How to send a free fax
Find a service that allows you to send faxes over the internet.
There's a list of services at the bottom of this page, or you can search for others.
Visit the terms of service for the website you select.
Be aware that some websites that send free faxes will send your fax with an ad on the first page, or will require you to consent to receive advertisements over email. If you're concerned about these things happening, check the tos.