<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2013-04-30</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001556739</issuerCik>
        <issuerName>DEX MEDIA, INC.</issuerName>
        <issuerTradingSymbol>DXM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001035674</rptOwnerCik>
            <rptOwnerName>PAULSON &amp; CO INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1251 AVENUE OF THE AMERICAS</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1878927</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Paulson &amp; Co. Inc. (&quot;Paulson&quot;) is an investment advisor registered under the Investment Advisors Act of 1940.  Paulson is the investment manager of Paulson Advantage Master Ltd., Paulson Advantage Plus Master Ltd., Paulson Credit Opportunities Master Ltd. and Paulson Recovery Master Fund Ltd. (collectively, the &quot;Funds&quot;). John Paulson is the controlling person of Paulson.  All securities reported on this Form 3 are owned by the Funds. Each of Paulson and John Paulson may be deemed to indirectly beneficially own the securities directly owned by the Funds.  Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the &quot;Act&quot;), the filing of this Form 3 shall not be deemed an admission by any person reporting on this Form 3 that such person, for purposes of Section 16 of the Act or otherwise, is the beneficial owner of any equity securities covered by this Form.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Stuart L. Merzer, General Counsel and Chief Compliance Officer of Paulson &amp; Co. Inc.</signatureName>
        <signatureDate>2013-05-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
