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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-05-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000101984</issuerCik>
        <issuerName>UNIVERSAL ELECTRONICS INC</issuerName>
        <issuerTradingSymbol>UEIC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001216547</rptOwnerCik>
            <rptOwnerName>FIREHAMMER RICHARD A JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>15147 N SCOTTSDALE RD STE H300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SCOTTSDALE</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85254</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-05-14</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>865</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>6.91</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-05-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5334</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each restricted stock unit represents a contingent right to receive one share of UEI common stock.</footnote>
        <footnote id="F2">Restricted stock grant was issued out of the discretionary pool authorized and approved by the Compensation Committee of the Board of Directors on April 9, 2025 and finalized and awarded on May 13, 2025. The shares will vest over 3 years on a ratable annual basis.</footnote>
        <footnote id="F3">This figure represents an aggregate number of restricted stock units held by Reporting Person.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Richard A. Firehammer, Jr., by Bryan Allison, pursuant to Limited Power of Attorney dated May 20, 2024</signatureName>
        <signatureDate>2025-05-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0508
4
2025-05-13
0
0000101984
UNIVERSAL ELECTRONICS INC
UEIC
0001216547
FIREHAMMER RICHARD A JR
15147 N SCOTTSDALE RD STE H300
SCOTTSDALE
AZ
85254
0
1
0
0
Senior Vice President
0
Common Stock
2025-05-14
4
S
0
865
6.91
D
0
D
Restricted Stock Units
2025-05-13
4
A
0
2000
0
A
Common Stock
2000
5334
D
Each restricted stock unit represents a contingent right to receive one share of UEI common stock.
Restricted stock grant was issued out of the discretionary pool authorized and approved by the Compensation Committee of the Board of Directors on April 9, 2025 and finalized and awarded on May 13, 2025. The shares will vest over 3 years on a ratable annual basis.
This figure represents an aggregate number of restricted stock units held by Reporting Person.
/s/Richard A. Firehammer, Jr., by Bryan Allison, pursuant to Limited Power of Attorney dated May 20, 2024
2025-05-14