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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-02-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001112920</issuerCik>
        <issuerName>GLOBALSCAPE INC</issuerName>
        <issuerTradingSymbol>GSB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001694574</rptOwnerCik>
            <rptOwnerName>Alpert Robert H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8214 WESTCHESTER DRIVE, SUITE 950</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75225</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001694781</rptOwnerCik>
            <rptOwnerName>RHA Investments, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8214 WESTCHESTER DRIVE, SUITE 950</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75225</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-02-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>26000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.8817</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>158700</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Atlas Capital Management, L.P.</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3200000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By 210/GSB Acquisition Partners, LLC</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Form 4 is being filed by (i) Robert H. Alpert, in his capacity as President and sole shareholder of RHA Investments, Inc. (&quot;RHA Investments&quot;), and (ii) RHA Investments, in its capacity as general partner of Atlas Capital Management, L.P. (&quot;ACM&quot;).</footnote>
        <footnote id="F2">These shares of common stock of GlobalSCAPE, Inc. (the &quot;Issuer&quot;) are held directly by ACM. As general partner of ACM, RHA Investments has the power to direct ACM's affairs, and as President and sole shareholder of RHA Investments, Mr. Alpert has the power to direct RHA Investments' affairs. Mr. Alpert and RHA Investments disclaim beneficial ownership of these shares of the Issuer's common stock and the filing of this Form 4 shall not be construed as an admission that such persons are beneficial owners of these shares of the Issuer's common stock.</footnote>
        <footnote id="F3">These shares of the Issuer's common stock are held directly by 210/GSB Acquisition Partners, LLC (&quot;GSB Acquisition&quot;). GSB Acquisition is managed by 210 Capital, LLC (&quot;210 Capital&quot;), its sole member, and Covenant RHA Partners, L.P. (&quot;RHA Partners&quot;) and CCW/LAW Holdings, LLC are the members of 210 Capital. RHA Investments is the general partner of RHA Partners and Mr. Alpert is the President and sole shareholder of RHA Investments. Mr. Alpert and RHA Investments disclaim beneficial ownership of these shares of the Issuer's common stock and the filing of this Form 4 shall not be construed as an admission that such persons are beneficial owners of these shares of the Issuer's common stock.</footnote>
        <footnote id="F4">The principal business address of each of the reporting persons is 8214 Westchester Drive, Suite 950, Dallas, Texas 75225.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>ROBERT H. ALPERT, By: /s/ Robert H. Alpert</signatureName>
        <signatureDate>2017-02-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>RHA INVESTMENTS, INC., By: /s/ Robert H. Alpert, Title: President</signatureName>
        <signatureDate>2017-02-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
