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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-01-01</periodOfReport>

    <issuer>
        <issuerCik>0000932372</issuerCik>
        <issuerName>Orange 21 Inc.</issuerName>
        <issuerTradingSymbol>ORNG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001071036</rptOwnerCik>
            <rptOwnerName>HAMOT SETH W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RRH CAPITAL MANAGEMENT INC.</rptOwnerStreet1>
            <rptOwnerStreet2>420 BOYLSTON STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-01-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4276</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21928</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The Reporting Person also indirectly beneficially owns (i) an aggregate 6,000 shares of Common Stock held in two trusts for the benefit of his children and (ii) 3,366,313 shares of Common Stock directly beneficially owned by Costa Brava Partnership III L.P., which may also be deemed to be indirectly beneficially owned by Roark, Reardon &amp; Hamot, LLC. Seth W. Hamot is the President and sole member of Roark, Rearden &amp; Hamot, LLC, which is the sole general partner of Costa Brava Partnership III L.P.  Pursuant to Instruction 4(b)(iv) of Form 4, Roark, Rearden &amp; Hamot, LLC and Seth W. Hamot have elected to report as indirectly beneficially owned the entire number of securities owned by such limited partnership, however each of them disclaims beneficial ownership of any securities, and any proceeds thereof, that exceed its or his pecuniary interest therein and/or that are not actually distributed to it or him.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Seth W. Hamot</signatureName>
        <signatureDate>2010-01-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
