<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-10-31</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001045280</issuerCik><issuerName>ON2 TECHNOLOGIES INC</issuerName>        <issuerTradingSymbol>ont</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001129746</rptOwnerCik><rptOwnerName>MEAGHER MARK J</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>21 CORPORATE DR.</rptOwnerStreet1><rptOwnerStreet2>STE. 103</rptOwnerStreet2><rptOwnerCity>CLIFTON PARK</rptOwnerCity><rptOwnerState>NY</rptOwnerState><rptOwnerZipCode>12065</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>1</isOther><otherText>Former Director</otherText></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-10-31</value></transactionDate><deemedExecutionDate></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>200000</value></transactionShares><transactionPricePerShare><value>1.36</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>600000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes></footnotes><remarks></remarks><ownerSignature><signatureName>/s/ Mark J. Meagher</signatureName><signatureDate>2003-11-04</signatureDate></ownerSignature></ownershipDocument>

