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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-04-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000730708</issuerCik>
        <issuerName>SEACOAST BANKING CORP OF FLORIDA</issuerName>
        <issuerTradingSymbol>SBCF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001830519</rptOwnerCik>
            <rptOwnerName>FORLENZA JOSEPH M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P.O. BOX 9012</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>STUART</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>34995</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP &amp; CRO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-04-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>112</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-04-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>298</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1529</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-04-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1040</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9498</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-04-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4166</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4166</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>35427</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Right to Buy</value>
                <footnoteId id="F5"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>31.15</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2028-04-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12635</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12635</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents an unvested time-based restricted stock award granted on April 1, 2022, which shall vest over 3 years in on-third increments, beginning April 1, 2023, and on each anniversary thereafter, subject to continued employment</footnote>
        <footnote id="F2">Represents an unvested time-based restricted stock award granted on April 1, 2023, which shall vest over 3 years in one-third increments, beginning April 2, 2024, and on each anniversary thereafter, subject to continued employment</footnote>
        <footnote id="F3">Represents an unvested time-based restricted stock award granted on April 1, 2024, which shall vest over 3 years in one-third increments, beginning April 1, 2025, and on each anniversary thereafter, subject to continued employment</footnote>
        <footnote id="F4">Represents an unvested time- based restricted stock award grated on April 1, 2025, which shall vest over 3 years in one-third increments, beginning April 1, 2026, and on each anniversary thereafter subject to continued employment</footnote>
        <footnote id="F5">Granted pursuant to the Company's Amended and Restated 2013 Incentive Plan</footnote>
        <footnote id="F6">Represents stock option granted on April 2, 2018 (&quot;grant date&quot;) that vests over 3 years in one-third increments each anniversary of the date of the grant beginning on the first anniversary of the date of grant, subject to continued employment</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Kathy L. Hsu as Power of Attorney for Joseph M. Forlenza</signatureName>
        <signatureDate>2025-04-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0508
4
2025-04-01
0
0000730708
SEACOAST BANKING CORP OF FLORIDA
SBCF
0001830519
FORLENZA JOSEPH M
P.O. BOX 9012
STUART
FL
34995
0
1
0
0
EVP & CRO
0
Common Stock
2025-04-01
4
F
0
112
25.50
D
0
D
Common Stock
2025-04-01
4
F
0
298
25.50
D
1529
D
Common Stock
2025-04-01
4
F
0
1040
25.50
D
9498
D
Common Stock
2025-04-01
4
A
0
4166
25.50
A
4166
D
Common Stock
35427
D
Common Stock Right to Buy
31.15
2028-04-02
Common Stock
12635
12635
D
Represents an unvested time-based restricted stock award granted on April 1, 2022, which shall vest over 3 years in on-third increments, beginning April 1, 2023, and on each anniversary thereafter, subject to continued employment
Represents an unvested time-based restricted stock award granted on April 1, 2023, which shall vest over 3 years in one-third increments, beginning April 2, 2024, and on each anniversary thereafter, subject to continued employment
Represents an unvested time-based restricted stock award granted on April 1, 2024, which shall vest over 3 years in one-third increments, beginning April 1, 2025, and on each anniversary thereafter, subject to continued employment
Represents an unvested time- based restricted stock award grated on April 1, 2025, which shall vest over 3 years in one-third increments, beginning April 1, 2026, and on each anniversary thereafter subject to continued employment
Granted pursuant to the Company's Amended and Restated 2013 Incentive Plan
Represents stock option granted on April 2, 2018 ("grant date") that vests over 3 years in one-third increments each anniversary of the date of the grant beginning on the first anniversary of the date of grant, subject to continued employment
/s/ Kathy L. Hsu as Power of Attorney for Joseph M. Forlenza
2025-04-03