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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-07-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001454742</issuerCik>
        <issuerName>HDS INTERNATIONAL CORP.</issuerName>
        <issuerTradingSymbol>hdsi</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>Recachinas Tassos D.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>FAIRFIELD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06825</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
                    <value>186225000</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value></value>
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                <transactionShares>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">All transferees were non-affiliates.</footnote>
        <footnote id="F2">Indirect ownership by hillwinds Ocean Energy, LLC which is controlled by Tassos Recachinas.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>TASSOS RECACHINAS</signatureName>
        <signatureDate>2012-07-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
