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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-03-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001676238</issuerCik>
        <issuerName>Braze, Inc.</issuerName>
        <issuerTradingSymbol>BRZE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001783518</rptOwnerCik>
            <rptOwnerName>Jacobson Matthew</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ICONIQ CAPITAL</rptOwnerStreet1>
            <rptOwnerStreet2>394 PACIFIC AVENUE, 2ND FLOOR</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94111</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-03-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1995966</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3326610</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners III, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-03-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F4"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2132714</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3554523</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners III-B, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>144576</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners VI, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>180424</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners VI-B, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F12"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2022-03-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1995966</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1995966</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2190680</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners III, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F12"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2022-03-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F4"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2132714</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2132714</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2340769</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners III-B, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F12"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>924889</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>924889</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F8"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners V, L.P.</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F12"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1424796</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1424796</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F9"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ICONIQ Strategic Partners V-B, L.P</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On March 23, 2022, ICONIQ Strategic Partners III, L.P. (&quot;ICONIQ III&quot;) converted in the aggregate 1,995,966 shares of the Issuer's Class B Common Stock into 1,995,966 shares of the Issuer's Class A Common Stock.</footnote>
        <footnote id="F2">These shares of Class A Common Stock remain subject to a lock-up agreement with the underwriters of the Issuer's initial public offering.</footnote>
        <footnote id="F3">The shares are held by ICONIQ III.</footnote>
        <footnote id="F4">On March 23, 2022, ICONIQ Strategic Partners III-B, L.P. (&quot;ICONIQ III-B&quot;) converted in the aggregate 2,132,714 shares of the Issuer's Class B Common Stock into 2,132,714 shares of the Issuer's Class A Common Stock.</footnote>
        <footnote id="F5">The shares are held by ICONIQ III-B.</footnote>
        <footnote id="F6">The shares are held by ICONIQ Strategic Partners VI, L.P. (&quot;ICONIQ VI&quot;).</footnote>
        <footnote id="F7">The shares are held by ICONIQ Strategic Partners VI-B, L.P. (&quot;ICONIQ VI-B&quot;).</footnote>
        <footnote id="F8">The shares are held by ICONIQ Strategic Partners V, L.P. (&quot;ICONIQ V&quot;).</footnote>
        <footnote id="F9">The shares are held by ICONIQ Strategic Partners V-B, L.P. (&quot;ICONIQ V-B&quot;).</footnote>
        <footnote id="F10">ICONIQ Strategic Partners III GP, L.P. (&quot;ICONIQ III GP&quot;) is the sole general partner of each of ICONIQ III and ICONIQ III-B. ICONIQ Strategic Partners III TT GP, Ltd. (&quot;ICONIQ III Parent GP&quot;) is the sole general partner of ICONIQ III GP. ICONIQ Strategic Partners V GP, L.P. (&quot;ICONIQ V GP&quot;) is the sole general partner of each of ICONIQ V and ICONIQ V-B. ICONIQ Strategic Partners V TT GP, Ltd. (&quot;ICONIQ V Parent GP&quot;) is the sole general partner of ICONIQ V GP. ICONIQ Strategic Partners VI GP, L.P. (&quot;ICONIQ VI GP&quot;) is the sole general partner of each of ICONIQ VI and ICONIQ VI-B. ICONIQ Strategic Partners VI TT GP, Ltd. (&quot;ICONIQ VI Parent GP&quot;) is the sole general partner of ICONIQ VI GP. Divesh Makan (&quot;Makan&quot;) and William J.G. Griffith (&quot;Griffith&quot;) are the sole equity holders of ICONIQ III Parent GP. Makan, Griffith and the Reporting Person are the sole equity holders of each of ICONIQ V Parent GP and ICONIQ VI Parent GP.</footnote>
        <footnote id="F11">The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the &quot;Exchange Act&quot;), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.</footnote>
        <footnote id="F12">Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock. Each share of Class B Common Stock will convert automatically into shares of Class A Common Stock, on a one-to-one basis, upon the following: (1) the death of a Class B common stockholder who is a natural person, (2) the last trading day of the fiscal quarter immediately following the fifth anniversary of this offering, (3) the date specified by affirmative vote of the holders of a majority of the outstanding shares of Class B Common Stock and (4) the last trading day of the fiscal quarter during which the then outstanding shares of Class B Common Stock first represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Matthew Jacobson</signatureName>
        <signatureDate>2022-03-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
