diff --git a/Documentation/OneLocBuild.md b/Documentation/OneLocBuild.md
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+# Localization with OneLocBuild in Arcade
+
+As of April 1, 2021, all .NET repositories will be using OneLocBuild for localization. Documentation on this system can
+be found [here](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task).
+This system is **not a replacement for Xliff-Tasks**; rather, it is replacing the localization team's old system called
+Simple Loc. Xliff-Tasks will continue to be used in addition to OneLocBuild.
+
+To make OneLocBuild easier to use, we have integrated the task into Arcade. This integration is a job template
+([here](/eng/common/templates/job/onelocbuild.yml)) that is described in this document.
+
+## LocProject.json Index File
+
+The core component of OneLocBuild is the LocProject.json file. This file is an index file containing references to
+all of the files to localize in your repository. In order to reduce overhead for repo owners, we are auto-generating
+the LocProject.json file (PowerShell script [here](/eng/common/generate-locproject.ps1)). This script and the
+OneLocBuild Azure DevOps task are both wrapped in the onelocbuild.yml job template.
+
+The script searches your checked-in code for all localized XLF files and template JSON files. Files can be excluded
+using a checked in file (/Localize/LocExclusions.json). The LocExclusions file excludes files based on simple matching.
+For example, the LocExclusions.json file below will exclude everything in a directory called `tests` and any file
+which include `test.xlf` in its name.
+
+```json
+{
+    "Exclusions": [
+        "\\tests\\",
+        "test.xlf"
+    ]
+}
+```
+
+The selected files are then added to a generated LocProject.json file. At this point, template currently provides two options
+for how to proceed.
+
+### Build-Time Generation
+
+**The recommended path** is to have the script pass the generated LocProject.json directly to the OneLocBuild task.
+This is the simpler of the two methods and removes the overhead of needing to maintain a checked in
+LocProject.json file. The LocProject.json file is emitted in build logs and as a build artifact for examination.
+
+### Build-Time Validation
+
+While it is **not the recommended path**, repos can instead opt to check in a static LocProject.json and have the
+script compare it against the generated one. If they differ, the script will break the build so that a dev can
+update either the LocProject.json or the LocExclusions.json file accordingly.
+
+Because the script can be run locally, devs can also do this validation prior to pushing their changes.
+
+### Custom LocProject.json Files
+
+Currently, the LocProject.json generation script only creates fairly uniform LocProject.json files. If your repository
+requires the use of any of the more complex LocProject.json features as described in the OneLocBuild docs linked above,
+the OneLocBuild template in this doc will not work and you will need to check in and maintain the LocProject.json file
+manually.
+
+## OneLocBuild Template Parameters
+
+The most basic structure for calling the OneLocBuild template is:
+
+```yaml
+jobs:
+- template: /eng/common/templates/job/onelocbuild.yml
+  parameters:
+    LclSource: lclFilesfromPackage
+    LclPackageId: 'LCL-PACKAGE-ID'
+```
+
+The parameters that can be passed to the template are as follows:
+
+| **Parameter** | **Default Value** | **Notes** |
+|:-:|:-:|-|
+| `RepoType` | `'gitHub'` | Should be set to `'gitHub'` for GitHub-based repositories and `'azureDevOps'` for Azure DevOps-based ones. |
+| `SourcesDirectory` | `$(Build.SourcesDirectory)` | This is the root directory for your repository source code. |
+| `CreatePr` | `true` | When set to `true`, instructs the OneLocBuild task to make a PR back to the source repository containing the localized files. |
+| `AutoCompletePr` | `false` | When set to `true`, instructs the OneLocBuild task to autocomplete the created PR. Requires permissions to bypass any checks on the main branch. |
+| `UseCheckedInLocProjectJson` | `false` | When set to `true`, instructs the LocProject.json generation script to use build-time validation rather than build-time generation, as described above. |
+| `LanguageSet` | `VS_Main_Languages` | This defines the `LanguageSet` of the LocProject.json as described in the [OneLocBuild task documentation](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task?anchor=languageset%2C-languages-(required)). |
+| `LclSource` | `LclFilesInRepo` | This passes the `LclSource` input to the OneLocBuild task as described in [its documentation](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task?anchor=languageset%2C-languages-(required)). For most repos, this should be set to `LclFilesfromPackage`. |
+| `LclPackageId` | `''` | When `LclSource` is set to `LclFilesfromPackage`, this passes in the package ID as described in the [OneLocBuild task documentation](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task?anchor=scenario-2%3A-lcl-files-from-a-package). |
+| `condition` | `''` | Allows for conditionalizing the template's steps on build-time variables. |
+
+It is recommended that you set `LclSource` and `LclPackageId` as shown in the example above.
\ No newline at end of file
diff --git a/eng/common/generate-locproject.ps1 b/eng/common/generate-locproject.ps1
new file mode 100644
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+Param(
+    [Parameter(Mandatory=$true)][string] $SourcesDirectory,     # Directory where source files live; if using a Localize directory it should live in here
+    [string] $LanguageSet = 'VS_Main_Languages',                # Language set to be used in the LocProject.json
+    [switch] $UseCheckedInLocProjectJson,                       # When set, generates a LocProject.json and compares it to one that already exists in the repo; otherwise just generates one
+    [switch] $CreateNeutralXlfs                                 # Creates neutral xlf files. Only set to false when running locally
+)
+
+# Generates LocProject.json files for the OneLocBuild task. OneLocBuildTask is described here:
+# https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task
+
+Set-StrictMode -Version 2.0
+$ErrorActionPreference = "Stop"
+. $PSScriptRoot\tools.ps1
+
+Import-Module -Name (Join-Path $PSScriptRoot 'native\CommonLibrary.psm1')
+
+$exclusionsFilePath = "$SourcesDirectory\Localize\LocExclusions.json"
+$exclusions = @{ Exclusions = @() }
+if (Test-Path -Path $exclusionsFilePath)
+{
+    $exclusions = Get-Content "$exclusionsFilePath" | ConvertFrom-Json
+}
+
+Push-Location "$SourcesDirectory" # push location for Resolve-Path -Relative to work
+
+# Template files
+$jsonFiles = @()
+$jsonFiles += Get-ChildItem -Recurse -Path "$SourcesDirectory" | Where-Object { $_.FullName -Match "\.template\.config\\localize\\en\..+\.json" } # .NET templating pattern
+$jsonFiles += Get-ChildItem -Recurse -Path "$SourcesDirectory" | Where-Object { $_.FullName -Match "en\\strings\.json" } # current winforms pattern
+
+$xlfFiles = @()
+
+$allXlfFiles = Get-ChildItem -Recurse -Path "$SourcesDirectory\*\*.xlf"
+$langXlfFiles = @()
+if ($allXlfFiles) {
+    $null = $allXlfFiles[0].FullName -Match "\.([\w-]+)\.xlf" # matches '[langcode].xlf'
+    $firstLangCode = $Matches.1
+    $langXlfFiles = Get-ChildItem -Recurse -Path "$SourcesDirectory\*\*.$firstLangCode.xlf"
+}
+$langXlfFiles | ForEach-Object {
+    $null = $_.Name -Match "(.+)\.[\w-]+\.xlf" # matches '[filename].[langcode].xlf'
+    
+    $destinationFile = "$($_.Directory.FullName)\$($Matches.1).xlf"
+    $xlfFiles += Copy-Item "$($_.FullName)" -Destination $destinationFile -PassThru
+}
+
+$locFiles = $jsonFiles + $xlfFiles
+
+$locJson = @{
+    Projects = @(
+        @{
+            LanguageSet = $LanguageSet
+            LocItems = @(
+                $locFiles | ForEach-Object {
+                    $outputPath = "$(($_.DirectoryName | Resolve-Path -Relative) + "\")" 
+                    $continue = $true
+                    foreach ($exclusion in $exclusions.Exclusions) {
+                        if ($outputPath.Contains($exclusion))
+                        {
+                            $continue = $false
+                        }
+                    }
+                    $sourceFile = ($_.FullName | Resolve-Path -Relative)
+                    if (!$CreateNeutralXlfs -and $_.Extension -eq '.xlf') {
+                        Remove-Item -Path $sourceFile
+                    }
+                    if ($continue)
+                    {
+                        if ($_.Directory.Name -eq 'en' -and $_.Extension -eq '.json') {
+                            return @{
+                                SourceFile = $sourceFile
+                                CopyOption = "LangIDOnPath"
+                                OutputPath = "$($_.Directory.Parent.FullName | Resolve-Path -Relative)\"
+                            }
+                        }
+                        else {
+                            return @{
+                                SourceFile = $sourceFile
+                                CopyOption = "LangIDOnName"
+                                OutputPath = $outputPath
+                            }
+                        }
+                    }
+                }
+            )
+        }
+    )
+}
+
+$json = ConvertTo-Json $locJson -Depth 5
+Write-Host "LocProject.json generated:`n`n$json`n`n"
+Pop-Location
+
+if (!$UseCheckedInLocProjectJson) {
+    New-Item "$SourcesDirectory\Localize\LocProject.json" -Force # Need this to make sure the Localize directory is created
+    Set-Content "$SourcesDirectory\Localize\LocProject.json" $json
+}
+else {
+    New-Item "$SourcesDirectory\Localize\LocProject-generated.json" -Force # Need this to make sure the Localize directory is created
+    Set-Content "$SourcesDirectory\Localize\LocProject-generated.json" $json
+
+    if ((Get-FileHash "$SourcesDirectory\Localize\LocProject-generated.json").Hash -ne (Get-FileHash "$SourcesDirectory\Localize\LocProject.json").Hash) {
+        Write-PipelineTelemetryError -Category "OneLocBuild" -Message "Existing LocProject.json differs from generated LocProject.json. Download LocProject-generated.json and compare them."
+        
+        exit 1
+    }
+    else {
+        Write-Host "Generated LocProject.json and current LocProject.json are identical."
+    }
+}
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diff --git a/eng/common/templates/job/onelocbuild.yml b/eng/common/templates/job/onelocbuild.yml
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+parameters:
+  # Optional: dependencies of the job
+  dependsOn: ''
+
+  # Optional: A defined YAML pool - https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema?view=vsts&tabs=schema#pool
+  pool:
+    vmImage: vs2017-win2016
+
+  CeapexPat: $(dn-bot-ceapex-package-r) # PAT for the loc AzDO instance https://dev.azure.com/ceapex
+  GithubPat: $(BotAccount-dotnet-bot-repo-PAT)
+
+  SourcesDirectory: $(Build.SourcesDirectory)
+  CreatePr: true
+  AutoCompletePr: false
+  UseCheckedInLocProjectJson: false
+  LanguageSet: VS_Main_Languages
+  LclSource: lclFilesInRepo
+  LclPackageId: ''
+  RepoType: gitHub
+  condition: ''
+
+jobs:
+- job: OneLocBuild
+  
+  dependsOn: ${{ parameters.dependsOn }}
+
+  displayName: OneLocBuild
+
+  pool: ${{ parameters.pool }}
+
+  variables:
+    - group: OneLocBuildVariables # Contains the CeapexPat and GithubPat
+    - name: _GenerateLocProjectArguments
+      value: -SourcesDirectory ${{ parameters.SourcesDirectory }}
+        -LanguageSet "${{ parameters.LanguageSet }}"
+        -CreateNeutralXlfs
+    - ${{ if eq(parameters.UseCheckedInLocProjectJson, 'true') }}:
+      - name: _GenerateLocProjectArguments
+        value: ${{ variables._GenerateLocProjectArguments }} -UseCheckedInLocProjectJson
+      
+
+  steps:
+    - task: Powershell@2
+      inputs:
+        filePath: $(Build.SourcesDirectory)/eng/common/generate-locproject.ps1
+        arguments: $(_GenerateLocProjectArguments)
+      displayName: Generate LocProject.json
+      condition: ${{ parameters.condition }}
+
+    - task: OneLocBuild@2
+      displayName: OneLocBuild
+      env:
+        SYSTEM_ACCESSTOKEN: $(System.AccessToken)
+      inputs:
+        locProj: Localize/LocProject.json
+        outDir: $(Build.ArtifactStagingDirectory)
+        lclSource: ${{ parameters.LclSource }}
+        lclPackageId: ${{ parameters.LclPackageId }}
+        isCreatePrSelected: ${{ parameters.CreatePr }}
+        ${{ if eq(parameters.CreatePr, true) }}:
+          isAutoCompletePrSelected: ${{ parameters.AutoCompletePr }}
+        packageSourceAuth: patAuth
+        patVariable: ${{ parameters.CeapexPat }}
+        ${{ if eq(parameters.RepoType, 'gitHub') }}:
+          repoType: ${{ parameters.RepoType }}
+          gitHubPatVariable: "${{ parameters.GithubPat }}"
+      condition: ${{ parameters.condition }}
+
+    - task: PublishBuildArtifacts@1
+      displayName: Publish Localization Files
+      inputs:
+        PathtoPublish: '$(Build.ArtifactStagingDirectory)/loc'
+        PublishLocation: Container
+        ArtifactName: Loc
+      condition: ${{ parameters.condition }}
+
+    - task: PublishBuildArtifacts@1
+      displayName: Publish LocProject.json
+      inputs:
+        PathtoPublish: '$(Build.SourcesDirectory)/Localize/'
+        PublishLocation: Container
+        ArtifactName: Loc
+      condition: ${{ parameters.condition }}
\ No newline at end of file