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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-04-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001938060</rptOwnerCik>
            <rptOwnerName>Carnifax Richard K</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>S.V.P. Global Operations</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11504</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-04-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>39216</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>39216</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>53217</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-04-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>39216</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>39216</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>92433</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12023</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12023</value>
                    <footnoteId id="F7"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (Rt to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F8"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F9"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18465</value>
                    <footnoteId id="F10"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each performance stock unit represents a contingent right to receive one share of UEI common stock.</footnote>
        <footnote id="F2">The performance stock unit award was approved and granted by the Compensation Committee of the Board of Directors on April 9, 2025. The performance stock unit award will vest in three separate tranches with one stock price market condition and three service conditions. Each tranche will vest only when both the stock price market and service conditions have been achieved. The stock price market condition must be met on or by the third anniversary of the grant (4/9/2028). Any unvested tranche will expire at close of business on 4/9/2028.</footnote>
        <footnote id="F3">This figure represents an aggregate number of performance stock units held by Reporting Person.</footnote>
        <footnote id="F4">The performance stock unit award was approved and granted by the Compensation Committee of the Board of Directors on April 9, 2025. The performance stock unit award will vest in three separate tranches with three separate stock price market and service conditions. Each tranche will vest only when both the market and service conditions have been achieved. The stock price market condition for each tranche must be met on or by the third anniversary of the grant (4/9/2028). Any unvested tranche will expire at close of business on 4/9/2028.</footnote>
        <footnote id="F5">Each restricted stock unit represents a contingent right to receive one share of UEI common stock.</footnote>
        <footnote id="F6">The restricted stock units vest in accordance with the vesting schedule of each RSU Grant.</footnote>
        <footnote id="F7">This figure represents an aggregate number of restricted stock units held by Reporting Person.</footnote>
        <footnote id="F8">Exercise Price Determined in accordance with the terms of the Company's applicable Stock Incentive Plan.</footnote>
        <footnote id="F9">The Exercisable and Expiration Dates were reported at the time the Stock Options were granted.</footnote>
        <footnote id="F10">This figure represents an aggregate number of stock options held by Reporting Person.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Richard K. Carnifax, by Kristin Cazarez, pursuant to Limited Power of Attorney dated May 7, 2024</signatureName>
        <signatureDate>2025-04-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0508
4
2025-04-09
0
0000101984
UNIVERSAL ELECTRONICS INC
UEIC
0001938060
Carnifax Richard K
15147 N SCOTTSDALE RD STE H300
SCOTTSDALE
AZ
85254
0
1
0
0
S.V.P. Global Operations
0
Common Stock
11504
D
Performance Stock Units
2025-04-09
4
A
0
39216
0
A
Common Stock
39216
53217
D
Performance Stock Units
2025-04-09
4
A
0
39216
0
A
Common Stock
39216
92433
D
Restricted Stock Units
Common Stock
12023
12023
D
Employee Stock Option (Rt to Buy)
Common Stock
0
18465
D
Each performance stock unit represents a contingent right to receive one share of UEI common stock.
The performance stock unit award was approved and granted by the Compensation Committee of the Board of Directors on April 9, 2025. The performance stock unit award will vest in three separate tranches with one stock price market condition and three service conditions. Each tranche will vest only when both the stock price market and service conditions have been achieved. The stock price market condition must be met on or by the third anniversary of the grant (4/9/2028). Any unvested tranche will expire at close of business on 4/9/2028.
This figure represents an aggregate number of performance stock units held by Reporting Person.
The performance stock unit award was approved and granted by the Compensation Committee of the Board of Directors on April 9, 2025. The performance stock unit award will vest in three separate tranches with three separate stock price market and service conditions. Each tranche will vest only when both the market and service conditions have been achieved. The stock price market condition for each tranche must be met on or by the third anniversary of the grant (4/9/2028). Any unvested tranche will expire at close of business on 4/9/2028.
Each restricted stock unit represents a contingent right to receive one share of UEI common stock.
The restricted stock units vest in accordance with the vesting schedule of each RSU Grant.
This figure represents an aggregate number of restricted stock units held by Reporting Person.
Exercise Price Determined in accordance with the terms of the Company's applicable Stock Incentive Plan.
The Exercisable and Expiration Dates were reported at the time the Stock Options were granted.
This figure represents an aggregate number of stock options held by Reporting Person.
/s/Richard K. Carnifax, by Kristin Cazarez, pursuant to Limited Power of Attorney dated May 7, 2024
2025-04-11