| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 671697 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | See Schedule OElectronic Frontier Foundation, Inc. ("EFF") was formed for the purpose of understanding and fostering the opportunities of digital communication in a free and open society. |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 426 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 426 |
| IRS990/AllOtherContributionsAmt | 0 | 6309495 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 2707 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 4991 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 6936 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 14634 |
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| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Kelly Esguerra |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 4154369333 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 815 Eddy Street |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | San Francisco |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 94109 |
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| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/AddressLine1Txt | 0 | c/o trust7 Consulting Am Borsigturm |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/CityNm | 0 | Berlin |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/CountryCd | 0 | GM |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/ForeignPostalCd | 0 | 13507 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | Jillian C York |
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| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 42175 |
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| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 197554 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 283218 |
| IRS990/Desc | 0 | Educated the public regarding new forms of technology, fostered discussion as well as public policy analysis regarding the legal and social issues raised by technology, and conducted litigation in the public interest to preserve human and civil rights. |
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| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
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| IRS990/ExpenseAmt | 0 | 10598533 |
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| IRS990/FederatedCampaignsAmt | 0 | 56484 |
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| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 33046 |
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| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 643493 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 687244 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 54393 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 40.00 |
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| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
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| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 38536 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 40255 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 18474 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 23530 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Pamela Samuelson |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Anil Dash |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Sarah Deutsch |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | David Farber |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | John Gilmore |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Brewster Kahle |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Bruce Schneier |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Gigi Sohn |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Shari Steele |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | James Vasile |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Jonathan Zittrain |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | Cindy Cohn |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | Kurt Opsahl |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | Kelly Esguerra |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | Corynne McSherry |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | Loraine Reitman |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | David Greene |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | Lee Tien |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | Adam Schwartz |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | Jennifer Lynch |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | Andres Arrieta |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 289738 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 224820 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 169406 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 209623 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 200480 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 217065 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 210223 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 172169 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 167075 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 162079 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Member (term start 5/20) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Member (term start 5/20) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Executive Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | Secretary/Deputy Exec. Dir. |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | Treasurer/Finance Dir. |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | Legal Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | Chief Program Officer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | Civil Liberties Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | Senior Staff Attorney |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | Senior Staff Attorney |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | Surveillance Litigation Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | Dir. of Consumer Privacy Engineering |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1990 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 7272 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 22128 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 22128 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 13 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 12268259 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 103053 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
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| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 45 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
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| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 5172 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 19154 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 27460 |
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| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 8908 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 102823 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 117128 |
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| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 25127068 |
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| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 12537925 |
| IRS990/LegalDomicileStateCd | 0 | MA |
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| IRS990/MembershipDuesAmt | 0 | 4405304 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | See Schedule O |
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| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 69743 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 69743 |
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| IRS990/NoncashContributionsAmt | 0 | 1378097 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
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| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 49015 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 181525 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 260238 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 20333 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 33605 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 124284 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 178222 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 182540 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 104309 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 781819 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 1068668 |
| IRS990/OtherExpensesGrp/Desc | 0 | Membership expenses |
| IRS990/OtherExpensesGrp/Desc | 1 | Litigation |
| IRS990/OtherExpensesGrp/Desc | 2 | Planning & development |
| IRS990/OtherExpensesGrp/Desc | 3 | Event expenses |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 460523 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 10740 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 17014 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 17726 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 13252 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 125129 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 65645 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 6635 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 473775 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 125129 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 94111 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 23649 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 1 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | CY Pres Awards |
| IRS990/OtherRevenueMiscGrp/Desc | 1 | Other income |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 112948 |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 1 | 2775 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 112948 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 1 | 2775 |
| IRS990/OtherRevenueTotalAmt | 0 | 115723 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 856647 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 1695489 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 6847844 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 9399980 |
| IRS990/OthNotesLoansReceivableNetGrp/BOYAmt | 0 | 397068 |
| IRS990/OthNotesLoansReceivableNetGrp/EOYAmt | 0 | 180636 |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 129309 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 71420 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 510234 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 710963 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 733 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 8711 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 61268 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 70712 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 1165887 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 601278 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 59134 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 58448 |
| IRS990/PrincipalOfficerNm | 0 | Cindy Cohn |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |