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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-09-05</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001357525</issuerCik>
        <issuerName>Omniture, Inc.</issuerName>
        <issuerTradingSymbol>OMTR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001366768</rptOwnerCik>
            <rptOwnerName>Pestana John R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OMNITURE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>550 EAST TIMPANOGOS CIRCLE</rptOwnerStreet2>
            <rptOwnerCity>OREM</rptOwnerCity>
            <rptOwnerState>UT</rptOwnerState>
            <rptOwnerZipCode>84097</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <value></value>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>24.01</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
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                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
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                </natureOfOwnership>
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        <nonDerivativeHolding>
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                <value>Common Stock</value>
            </securityTitle>
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                    <footnoteId id="F3"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By SSWRTW Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
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                    <footnoteId id="F4"/>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2007.</footnote>
        <footnote id="F2">Mr. Pestana is the managing member of Erutinmo, LLC and has sole voting and investment power with respect to all shares of common stock held by Erutinmo, LLC.</footnote>
        <footnote id="F3">Mr. Pestana is the trustee of the SSWRTW Trust (the &quot;Trust&quot;) and has sole voting and investment power with respect to all shares of common stock held by the Trust.  Mr. Pestana is also a beneficiary of the Trust.  Mr. Pestana disclaims beneficial ownership of the shares of common stock held by the Trust, except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F4">47,479 shares are subject to a right of repurchase in favor of the Issuer upon Mr. Pestana's cessation of service, which right of repurchase lapses at the rate of 21,559 shares per month.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Shawn Lindquist, attorney-in-fact</signatureName>
        <signatureDate>2007-09-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
