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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2022-03-16</periodOfReport>

    <dateOfOriginalSubmission>2022-03-17</dateOfOriginalSubmission>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001626450</issuerCik>
        <issuerName>BigCommerce Holdings, Inc.</issuerName>
        <issuerTradingSymbol>BIGC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001766508</rptOwnerCik>
            <rptOwnerName>Richards Jeffrey Gordon</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BIGCOMMERCE HOLDINGS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>11305 FOUR POINTS DR, BLDG II, 3RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>AUSTIN</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78726</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Series 1 Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-03-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3760.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.119</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2256708.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By GGV Capital V L.P.</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On March 17, 2021, the Reporting Person filed a Form 4 that inadvertently reported code &quot;P&quot; but should have reported code &quot;S&quot;. This Amendment to Form 4 is being filed solely to correct the code that was inadvertently reported as code &quot;P,&quot; but should have been reported as code &quot;S.&quot; All other information set forth in the original Form 4 remains correct.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.0869 to $21.0868, inclusive. The reporting person undertakes to provide to BigCommerce Holdings, Inc., any security holder of BigCommerce Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the ranges set forth in Footnote 2 to this Form 4.</footnote>
        <footnote id="F3">The reported securities are held directly by GGV Capital V L.P. GGV Capital V L.L.C. is the general partner of GGV Capital V L.P. The Reporting Person is the managing director of GGV Capital V L.L.C., and, as a result, may be deemed to have voting and dispositive power over the shares held by by GGV Capital V L.P. The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest in such securities.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jeffrey Richards</signatureName>
        <signatureDate>2022-03-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
