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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-02-20</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001496963</issuerCik>
        <issuerName>Squarespace, Inc.</issuerName>
        <issuerTradingSymbol>SQSP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001856601</rptOwnerCik>
            <rptOwnerName>Gubbay Paul</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SQUARESPACE, INC.,</rptOwnerStreet1>
            <rptOwnerStreet2>225 VARICK STREET, 12TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10014</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Chief Product Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

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                </transactionShares>
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    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
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                <equitySwapInvolved>false</equitySwapInvolved>
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                </transactionShares>
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                    <value>0.00</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8056.00</value>
                </underlyingSecurityShares>
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                <equitySwapInvolved>false</equitySwapInvolved>
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                </underlyingSecurityTitle>
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            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
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                <equitySwapInvolved>false</equitySwapInvolved>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <securityTitle>
                <value>Performance Restricted Stock Units</value>
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                <equitySwapInvolved>false</equitySwapInvolved>
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                <transactionShares>
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                </transactionShares>
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                <equitySwapInvolved>false</equitySwapInvolved>
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                <transactionShares>
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                <transactionPricePerShare>
                    <value>0.00</value>
                    <footnoteId id="F5"/>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
                <footnoteId id="F5"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>25399.00</value>
                </sharesOwnedFollowingTransaction>
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    <footnotes>
        <footnote id="F1">Shares withheld by Issuer to satisfy applicable withholding tax upon vesting of restricted stock units.</footnote>
        <footnote id="F2">On January 20, 2021, the reporting person received a grant of 32,224 restricted stock units, which vests as follows: (a) 25% on February 20, 2022, (b) 25% on February 20, 2023, (c) 25% on February 20, 2024 and (d) 25% on February 20, 2025, subject to continued employment through the applicable vesting date, provided, that if such date falls on a weekend or holiday, the vesting date shall be the first business day after such date.</footnote>
        <footnote id="F3">On February 22, 2022, the reporting person received a grant of 65,967 restricted stock units, which vests as follows: (a) 25% on February 20, 2023 and (b) 6.25% quarterly thereafter, subject to continued employment through the applicable vesting date, provided, that if such date falls on a weekend or holiday, the vesting date shall be the first business day after such date.</footnote>
        <footnote id="F4">On March 3, 2023, the reporting person received a grant of 70,133 restricted stock units, which vests as follows: (a) 25% on February 20, 2024 and (b) 6.25% quarterly thereafter, subject to continued employment through the applicable vesting date, provided, that if such date falls on a weekend or holiday, the vesting date shall be the first business day after such date.</footnote>
        <footnote id="F5">On March 3, 2023, the reporting person received a grant of restricted stock units, eligible to vest subject to the achievement of certain performance criteria and the satisfaction of service conditions. On February 21, 2024, the Compensation Committee determined that the performance criteria was met, resulting in the reporting person earning 38,098 restricted stock units that shall vest upon satisfaction of the following service conditions: (a) one-third immediately vested upon certification by the Compensation Committee on February 21, 2024, (b) one-third on February 20, 2025 and (c) one-third on February 20, 2026, subject to continued employment through the applicable vesting date, provided, that if such date falls on a weekend or holiday, the vesting date shall be the first business day after such date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Allyson Wilkinson, as Attorney-in-Fact</signatureName>
        <signatureDate>2024-02-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
