diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 8d8b4d02..54b6132e 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -216,7 +216,11 @@ set(MINECRAFT_SOURCES
     minecraft/auth/flows/Mojang.h
     minecraft/auth/flows/MSA.cpp
     minecraft/auth/flows/MSA.h
+    minecraft/auth/flows/Offline.cpp
+    minecraft/auth/flows/Offline.h
 
+    minecraft/auth/steps/OfflineStep.cpp
+    minecraft/auth/steps/OfflineStep.h
     minecraft/auth/steps/EntitlementsStep.cpp
     minecraft/auth/steps/EntitlementsStep.h
     minecraft/auth/steps/GetSkinStep.cpp
@@ -781,6 +785,8 @@ SET(LAUNCHER_SOURCES
     ui/dialogs/LoginDialog.h
     ui/dialogs/MSALoginDialog.cpp
     ui/dialogs/MSALoginDialog.h
+    ui/dialogs/OfflineLoginDialog.cpp
+    ui/dialogs/OfflineLoginDialog.h
     ui/dialogs/NewComponentDialog.cpp
     ui/dialogs/NewComponentDialog.h
     ui/dialogs/NewInstanceDialog.cpp
@@ -896,6 +902,7 @@ qt5_wrap_ui(LAUNCHER_UI
     ui/dialogs/ExportInstanceDialog.ui
     ui/dialogs/IconPickerDialog.ui
     ui/dialogs/MSALoginDialog.ui
+    ui/dialogs/OfflineLoginDialog.ui
     ui/dialogs/AboutDialog.ui
     ui/dialogs/LoginDialog.ui
     ui/dialogs/EditAccountDialog.ui
diff --git a/launcher/LaunchController.cpp b/launcher/LaunchController.cpp
index 7750be1a..32fc99cb 100644
--- a/launcher/LaunchController.cpp
+++ b/launcher/LaunchController.cpp
@@ -116,6 +116,12 @@ void LaunchController::login() {
         m_session->wants_online = m_online;
         m_accountToUse->fillSession(m_session);
 
+        // Launch immediately in true offline mode
+        if(m_accountToUse->isOffline()) {
+            launchInstance();
+            return;
+        }
+
         switch(m_accountToUse->accountState()) {
             case AccountState::Offline: {
                 m_session->wants_online = false;
diff --git a/launcher/minecraft/auth/AccountData.cpp b/launcher/minecraft/auth/AccountData.cpp
index 7526c951..9b84fe1a 100644
--- a/launcher/minecraft/auth/AccountData.cpp
+++ b/launcher/minecraft/auth/AccountData.cpp
@@ -314,6 +314,8 @@ bool AccountData::resumeStateFromV3(QJsonObject data) {
         type = AccountType::MSA;
     } else if (typeS == "Mojang") {
         type = AccountType::Mojang;
+    } else if (typeS == "Offline") {
+        type = AccountType::Offline;
     } else {
         qWarning() << "Failed to parse account data: type is not recognized.";
         return false;
@@ -363,6 +365,9 @@ QJsonObject AccountData::saveState() const {
         tokenToJSONV3(output, xboxApiToken, "xrp-main");
         tokenToJSONV3(output, mojangservicesToken, "xrp-mc");
     }
+    else if (type == AccountType::Offline) {
+        output["type"] = "Offline";
+    }
 
     tokenToJSONV3(output, yggdrasilToken, "ygg");
     profileToJSONV3(output, minecraftProfile, "profile");
@@ -371,7 +376,7 @@ QJsonObject AccountData::saveState() const {
 }
 
 QString AccountData::userName() const {
-    if(type != AccountType::Mojang) {
+    if(type == AccountType::MSA) {
         return QString();
     }
     return yggdrasilToken.extra["userName"].toString();
@@ -427,6 +432,9 @@ QString AccountData::accountDisplayString() const {
         case AccountType::Mojang: {
             return userName();
         }
+        case AccountType::Offline: {
+            return userName();
+        }
         case AccountType::MSA: {
             if(xboxApiToken.extra.contains("gtg")) {
                 return xboxApiToken.extra["gtg"].toString();
diff --git a/launcher/minecraft/auth/AccountData.h b/launcher/minecraft/auth/AccountData.h
index abf84e43..606c1ad1 100644
--- a/launcher/minecraft/auth/AccountData.h
+++ b/launcher/minecraft/auth/AccountData.h
@@ -38,7 +38,8 @@ struct MinecraftProfile {
 
 enum class AccountType {
     MSA,
-    Mojang
+    Mojang,
+    Offline
 };
 
 enum class AccountState {
diff --git a/launcher/minecraft/auth/AccountList.cpp b/launcher/minecraft/auth/AccountList.cpp
index ef8b435d..04470e1c 100644
--- a/launcher/minecraft/auth/AccountList.cpp
+++ b/launcher/minecraft/auth/AccountList.cpp
@@ -302,7 +302,7 @@ QVariant AccountList::data(const QModelIndex &index, int role) const
             }
 
             case MigrationColumn: {
-                if(account->isMSA()) {
+                if(account->isMSA() || account->isOffline()) {
                     return tr("N/A", "Can Migrate?");
                 }
                 if (account->canMigrate()) {
diff --git a/launcher/minecraft/auth/MinecraftAccount.cpp b/launcher/minecraft/auth/MinecraftAccount.cpp
index ed9e945e..ffc81ed8 100644
--- a/launcher/minecraft/auth/MinecraftAccount.cpp
+++ b/launcher/minecraft/auth/MinecraftAccount.cpp
@@ -30,6 +30,7 @@
 
 #include "flows/MSA.h"
 #include "flows/Mojang.h"
+#include "flows/Offline.h"
 
 MinecraftAccount::MinecraftAccount(QObject* parent) : QObject(parent) {
     data.internalId = QUuid::createUuid().toString().remove(QRegExp("[{}-]"));
@@ -68,6 +69,23 @@ MinecraftAccountPtr MinecraftAccount::createBlankMSA()
     return account;
 }
 
+MinecraftAccountPtr MinecraftAccount::createOffline(const QString &username)
+{
+    MinecraftAccountPtr account = new MinecraftAccount();
+    account->data.type = AccountType::Offline;
+    account->data.yggdrasilToken.token = "offline";
+    account->data.yggdrasilToken.validity = Katabasis::Validity::Certain;
+    account->data.yggdrasilToken.issueInstant = QDateTime::currentDateTimeUtc();
+    account->data.yggdrasilToken.extra["userName"] = username;
+    account->data.yggdrasilToken.extra["clientToken"] = QUuid::createUuid().toString().remove(QRegExp("[{}-]"));
+    account->data.minecraftEntitlement.ownsMinecraft = true;
+    account->data.minecraftEntitlement.canPlayMinecraft = true;
+    account->data.minecraftProfile.id = QUuid::createUuid().toString().remove(QRegExp("[{}-]"));
+    account->data.minecraftProfile.name = username;
+    account->data.minecraftProfile.validity = Katabasis::Validity::Certain;
+    return account;
+}
+
 
 QJsonObject MinecraftAccount::saveToJson() const
 {
@@ -111,6 +129,16 @@ shared_qobject_ptr<AccountTask> MinecraftAccount::loginMSA() {
     return m_currentTask;
 }
 
+shared_qobject_ptr<AccountTask> MinecraftAccount::loginOffline() {
+    Q_ASSERT(m_currentTask.get() == nullptr);
+
+    m_currentTask.reset(new OfflineLogin(&data));
+    connect(m_currentTask.get(), SIGNAL(succeeded()), SLOT(authSucceeded()));
+    connect(m_currentTask.get(), SIGNAL(failed(QString)), SLOT(authFailed(QString)));
+    emit activityChanged(true);
+    return m_currentTask;
+}
+
 shared_qobject_ptr<AccountTask> MinecraftAccount::refresh() {
     if(m_currentTask) {
         return m_currentTask;
@@ -119,6 +147,9 @@ shared_qobject_ptr<AccountTask> MinecraftAccount::refresh() {
     if(data.type == AccountType::MSA) {
         m_currentTask.reset(new MSASilent(&data));
     }
+    else if(data.type == AccountType::Offline) {
+        m_currentTask.reset(new OfflineRefresh(&data));
+    }
     else {
         m_currentTask.reset(new MojangRefresh(&data));
     }
diff --git a/launcher/minecraft/auth/MinecraftAccount.h b/launcher/minecraft/auth/MinecraftAccount.h
index 7ab3c746..6592f9c0 100644
--- a/launcher/minecraft/auth/MinecraftAccount.h
+++ b/launcher/minecraft/auth/MinecraftAccount.h
@@ -73,6 +73,8 @@ public: /* construction */
 
     static MinecraftAccountPtr createBlankMSA();
 
+    static MinecraftAccountPtr createOffline(const QString &username);
+
     static MinecraftAccountPtr loadFromJsonV2(const QJsonObject &json);
     static MinecraftAccountPtr loadFromJsonV3(const QJsonObject &json);
 
@@ -89,6 +91,8 @@ public: /* manipulation */
 
     shared_qobject_ptr<AccountTask> loginMSA();
 
+    shared_qobject_ptr<AccountTask> loginOffline();
+
     shared_qobject_ptr<AccountTask> refresh();
 
     shared_qobject_ptr<AccountTask> currentTask();
@@ -128,6 +132,10 @@ public: /* queries */
         return data.type == AccountType::MSA;
     }
 
+    bool isOffline() const {
+        return data.type == AccountType::Offline;
+    }
+
     bool ownsMinecraft() const {
         return data.minecraftEntitlement.ownsMinecraft;
     }
@@ -149,6 +157,10 @@ public: /* queries */
                 return "msa";
             }
             break;
+            case AccountType::Offline: {
+                return "offline";
+            }
+            break;
             default: {
                 return "unknown";
             }
diff --git a/launcher/minecraft/auth/flows/Offline.cpp b/launcher/minecraft/auth/flows/Offline.cpp
new file mode 100644
index 00000000..fc614a8c
--- /dev/null
+++ b/launcher/minecraft/auth/flows/Offline.cpp
@@ -0,0 +1,17 @@
+#include "Offline.h"
+
+#include "minecraft/auth/steps/OfflineStep.h"
+
+OfflineRefresh::OfflineRefresh(
+    AccountData *data,
+    QObject *parent
+) : AuthFlow(data, parent) {
+    m_steps.append(new OfflineStep(m_data));
+}
+
+OfflineLogin::OfflineLogin(
+    AccountData *data,
+    QObject *parent
+) : AuthFlow(data, parent) {
+    m_steps.append(new OfflineStep(m_data));
+}
diff --git a/launcher/minecraft/auth/flows/Offline.h b/launcher/minecraft/auth/flows/Offline.h
new file mode 100644
index 00000000..5d1f83a4
--- /dev/null
+++ b/launcher/minecraft/auth/flows/Offline.h
@@ -0,0 +1,22 @@
+#pragma once
+#include "AuthFlow.h"
+
+class OfflineRefresh : public AuthFlow
+{
+    Q_OBJECT
+public:
+    explicit OfflineRefresh(
+        AccountData *data,
+        QObject *parent = 0
+    );
+};
+
+class OfflineLogin : public AuthFlow
+{
+    Q_OBJECT
+public:
+    explicit OfflineLogin(
+        AccountData *data,
+        QObject *parent = 0
+    );
+};
diff --git a/launcher/minecraft/auth/steps/OfflineStep.cpp b/launcher/minecraft/auth/steps/OfflineStep.cpp
new file mode 100644
index 00000000..dc092bfd
--- /dev/null
+++ b/launcher/minecraft/auth/steps/OfflineStep.cpp
@@ -0,0 +1,18 @@
+#include "OfflineStep.h"
+
+#include "Application.h"
+
+OfflineStep::OfflineStep(AccountData* data) : AuthStep(data) {}
+OfflineStep::~OfflineStep() noexcept = default;
+
+QString OfflineStep::describe() {
+    return tr("Creating offline account.");
+}
+
+void OfflineStep::rehydrate() {
+    // NOOP
+}
+
+void OfflineStep::perform() {
+    emit finished(AccountTaskState::STATE_WORKING, tr("Created offline account."));
+}
diff --git a/launcher/minecraft/auth/steps/OfflineStep.h b/launcher/minecraft/auth/steps/OfflineStep.h
new file mode 100644
index 00000000..436597cd
--- /dev/null
+++ b/launcher/minecraft/auth/steps/OfflineStep.h
@@ -0,0 +1,19 @@
+#pragma once
+#include <QObject>
+
+#include "QObjectPtr.h"
+#include "minecraft/auth/AuthStep.h"
+
+#include <katabasis/DeviceFlow.h>
+
+class OfflineStep : public AuthStep {
+    Q_OBJECT
+public:
+    explicit OfflineStep(AccountData *data);
+    virtual ~OfflineStep() noexcept;
+
+    void perform() override;
+    void rehydrate() override;
+
+    QString describe() override;
+};
diff --git a/launcher/ui/dialogs/OfflineLoginDialog.cpp b/launcher/ui/dialogs/OfflineLoginDialog.cpp
new file mode 100644
index 00000000..345ed40a
--- /dev/null
+++ b/launcher/ui/dialogs/OfflineLoginDialog.cpp
@@ -0,0 +1,98 @@
+#include "OfflineLoginDialog.h"
+#include "ui_OfflineLoginDialog.h"
+
+#include "minecraft/auth/AccountTask.h"
+
+#include <QtWidgets/QPushButton>
+
+OfflineLoginDialog::OfflineLoginDialog(QWidget *parent) : QDialog(parent), ui(new Ui::OfflineLoginDialog)
+{
+    ui->setupUi(this);
+    ui->progressBar->setVisible(false);
+    ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
+
+    connect(ui->buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
+    connect(ui->buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
+}
+
+OfflineLoginDialog::~OfflineLoginDialog()
+{
+    delete ui;
+}
+
+// Stage 1: User interaction
+void OfflineLoginDialog::accept()
+{
+    setUserInputsEnabled(false);
+    ui->progressBar->setVisible(true);
+
+    // Setup the login task and start it
+    m_account = MinecraftAccount::createOffline(ui->userTextBox->text());
+    m_loginTask = m_account->loginOffline();
+    connect(m_loginTask.get(), &Task::failed, this, &OfflineLoginDialog::onTaskFailed);
+    connect(m_loginTask.get(), &Task::succeeded, this, &OfflineLoginDialog::onTaskSucceeded);
+    connect(m_loginTask.get(), &Task::status, this, &OfflineLoginDialog::onTaskStatus);
+    connect(m_loginTask.get(), &Task::progress, this, &OfflineLoginDialog::onTaskProgress);
+    m_loginTask->start();
+}
+
+void OfflineLoginDialog::setUserInputsEnabled(bool enable)
+{
+    ui->userTextBox->setEnabled(enable);
+    ui->buttonBox->setEnabled(enable);
+}
+
+// Enable the OK button only when the textbox contains something.
+void OfflineLoginDialog::on_userTextBox_textEdited(const QString &newText)
+{
+    ui->buttonBox->button(QDialogButtonBox::Ok)
+        ->setEnabled(!newText.isEmpty());
+}
+
+void OfflineLoginDialog::onTaskFailed(const QString &reason)
+{
+    // Set message
+    auto lines = reason.split('\n');
+    QString processed;
+    for(auto line: lines) {
+        if(line.size()) {
+            processed += "<font color='red'>" + line + "</font><br />";
+        }
+        else {
+            processed += "<br />";
+        }
+    }
+    ui->label->setText(processed);
+
+    // Re-enable user-interaction
+    setUserInputsEnabled(true);
+    ui->progressBar->setVisible(false);
+}
+
+void OfflineLoginDialog::onTaskSucceeded()
+{
+    QDialog::accept();
+}
+
+void OfflineLoginDialog::onTaskStatus(const QString &status)
+{
+    ui->label->setText(status);
+}
+
+void OfflineLoginDialog::onTaskProgress(qint64 current, qint64 total)
+{
+    ui->progressBar->setMaximum(total);
+    ui->progressBar->setValue(current);
+}
+
+// Public interface
+MinecraftAccountPtr OfflineLoginDialog::newAccount(QWidget *parent, QString msg)
+{
+    OfflineLoginDialog dlg(parent);
+    dlg.ui->label->setText(msg);
+    if (dlg.exec() == QDialog::Accepted)
+    {
+        return dlg.m_account;
+    }
+    return 0;
+}
diff --git a/launcher/ui/dialogs/OfflineLoginDialog.h b/launcher/ui/dialogs/OfflineLoginDialog.h
new file mode 100644
index 00000000..5e608379
--- /dev/null
+++ b/launcher/ui/dialogs/OfflineLoginDialog.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include <QtWidgets/QDialog>
+#include <QtCore/QEventLoop>
+
+#include "minecraft/auth/MinecraftAccount.h"
+#include "tasks/Task.h"
+
+namespace Ui
+{
+class OfflineLoginDialog;
+}
+
+class OfflineLoginDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    ~OfflineLoginDialog();
+
+    static MinecraftAccountPtr newAccount(QWidget *parent, QString message);
+
+private:
+    explicit OfflineLoginDialog(QWidget *parent = 0);
+
+    void setUserInputsEnabled(bool enable);
+
+protected
+slots:
+    void accept();
+
+    void onTaskFailed(const QString &reason);
+    void onTaskSucceeded();
+    void onTaskStatus(const QString &status);
+    void onTaskProgress(qint64 current, qint64 total);
+
+    void on_userTextBox_textEdited(const QString &newText);
+
+private:
+    Ui::OfflineLoginDialog *ui;
+    MinecraftAccountPtr m_account;
+    Task::Ptr m_loginTask;
+};
diff --git a/launcher/ui/dialogs/OfflineLoginDialog.ui b/launcher/ui/dialogs/OfflineLoginDialog.ui
new file mode 100644
index 00000000..d8964a2e
--- /dev/null
+++ b/launcher/ui/dialogs/OfflineLoginDialog.ui
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>OfflineLoginDialog</class>
+ <widget class="QDialog" name="OfflineLoginDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>150</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Add Account</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string notr="true">Message label placeholder.</string>
+     </property>
+     <property name="textFormat">
+      <enum>Qt::RichText</enum>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLineEdit" name="userTextBox">
+     <property name="placeholderText">
+      <string>Username</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QProgressBar" name="progressBar">
+     <property name="value">
+      <number>69</number>
+     </property>
+     <property name="textVisible">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/launcher/ui/pages/global/AccountListPage.cpp b/launcher/ui/pages/global/AccountListPage.cpp
index b8da6c75..396d320f 100644
--- a/launcher/ui/pages/global/AccountListPage.cpp
+++ b/launcher/ui/pages/global/AccountListPage.cpp
@@ -24,6 +24,7 @@
 #include "net/NetJob.h"
 
 #include "ui/dialogs/ProgressDialog.h"
+#include "ui/dialogs/OfflineLoginDialog.h"
 #include "ui/dialogs/LoginDialog.h"
 #include "ui/dialogs/MSALoginDialog.h"
 #include "ui/dialogs/CustomMessageBox.h"
@@ -153,6 +154,35 @@ void AccountListPage::on_actionAddMicrosoft_triggered()
     }
 }
 
+void AccountListPage::on_actionAddOffline_triggered()
+{
+    if (!m_accounts->anyAccountIsValid()) {
+        QMessageBox::warning(
+            this,
+            tr("Error"),
+            tr(
+                "You must add a Microsoft or Mojang account that owns Minecraft before you can add an offline account."
+                "<br><br>"
+                "If you have lost your account you can contact Microsoft for support."
+            )
+        );
+        return;
+    }
+
+    MinecraftAccountPtr account = OfflineLoginDialog::newAccount(
+        this,
+        tr("Please enter your desired username to add your offline account.")
+    );
+
+    if (account)
+    {
+        m_accounts->addAccount(account);
+        if (m_accounts->count() == 1) {
+            m_accounts->setDefaultAccount(account);
+        }
+    }
+}
+
 void AccountListPage::on_actionRemove_triggered()
 {
     QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
diff --git a/launcher/ui/pages/global/AccountListPage.h b/launcher/ui/pages/global/AccountListPage.h
index 1c65e708..841c3fd2 100644
--- a/launcher/ui/pages/global/AccountListPage.h
+++ b/launcher/ui/pages/global/AccountListPage.h
@@ -62,6 +62,7 @@ public:
 public slots:
     void on_actionAddMojang_triggered();
     void on_actionAddMicrosoft_triggered();
+    void on_actionAddOffline_triggered();
     void on_actionRemove_triggered();
     void on_actionRefresh_triggered();
     void on_actionSetDefault_triggered();
diff --git a/launcher/ui/pages/global/AccountListPage.ui b/launcher/ui/pages/global/AccountListPage.ui
index 29738c02..d21a92e2 100644
--- a/launcher/ui/pages/global/AccountListPage.ui
+++ b/launcher/ui/pages/global/AccountListPage.ui
@@ -54,6 +54,7 @@
    </attribute>
    <addaction name="actionAddMicrosoft"/>
    <addaction name="actionAddMojang"/>
+   <addaction name="actionAddOffline"/>
    <addaction name="actionRefresh"/>
    <addaction name="actionRemove"/>
    <addaction name="actionSetDefault"/>
@@ -103,6 +104,11 @@
     <string>Add Microsoft</string>
    </property>
   </action>
+  <action name="actionAddOffline">
+   <property name="text">
+    <string>Add Offline</string>
+   </property>
+  </action>
   <action name="actionRefresh">
    <property name="text">
     <string>Refresh</string>