diff --git a/locales/en-US.json b/locales/en-US.json
index 74f43d90..664d99a9 100644
--- a/locales/en-US.json
+++ b/locales/en-US.json
@@ -484,5 +484,15 @@
     "channel_tab_releases_label": "Releases",
     "channel_tab_playlists_label": "Playlists",
     "channel_tab_community_label": "Community",
-    "channel_tab_channels_label": "Channels"
+    "channel_tab_channels_label": "Channels",
+    "setup-totp-form-header": "Setup two factor authenticiation (TOTP)",
+    "setup-totp-instructions-download-auth": "Install an authenticator app (or anything that supports totp) on your device",
+    "setup-totp-instructions-enter-code": "Enter the following <strong>secret</strong> code:",
+    "setup-totp-instructions-validate-code": "Enter the 6 digit number on your screen. Be sure to do it under thirty seconds!",
+    "setup-totp-submit-button": "Setup TOTP",
+    "general-totp-empty-field": "The TOTP code is a required field",
+    "general-totp-invalid-code": "The TOTP code entered is invalid",
+    "general-totp-enter-code-field": "6 digit number",
+    "general-totp-enter-code-header": "Two-factor authentication",
+    "general-totp-verify-button": "Verifiy"
 }
diff --git a/shard.lock b/shard.lock
index 235e4c25..03f89fbb 100644
--- a/shard.lock
+++ b/shard.lock
@@ -1,12 +1,24 @@
 version: 2.0
 shards:
+  ameba:
+    git: https://github.com/crystal-ameba/ameba.git
+    version: 0.14.4
+
   athena-negotiation:
     git: https://github.com/athena-framework/negotiation.git
-    version: 0.1.1
+    version: 0.1.3
 
   backtracer:
     git: https://github.com/sija/backtracer.cr.git
-    version: 1.2.1
+    version: 1.2.2
+
+  base32:
+    git: https://github.com/philnash/base32.git
+    version: 0.1.1+git.commit.0a21c1d90731fdefcb3f0db4913f49d3d25350ac
+
+  crotp:
+    git: https://github.com/philnash/crotp.git
+    version: 1.0.0
 
   db:
     git: https://github.com/crystal-lang/crystal-db.git
@@ -42,12 +54,9 @@ shards:
 
   spectator:
     git: https://github.com/icy-arctic-fox/spectator.git
-    version: 0.10.4
+    version: 0.10.6
 
   sqlite3:
     git: https://github.com/crystal-lang/crystal-sqlite3.git
     version: 0.18.0
 
-  ameba:
-    git: https://github.com/crystal-ameba/ameba.git
-    version: 0.14.3
diff --git a/shard.yml b/shard.yml
index 7ee0bb2a..301f6c3f 100644
--- a/shard.yml
+++ b/shard.yml
@@ -31,6 +31,8 @@ dependencies:
   athena-negotiation:
     github: athena-framework/negotiation
     version: ~> 0.1.1
+  crotp:
+    github: philnash/crotp
 
 development_dependencies:
   spectator:
diff --git a/src/invidious/helpers/utils.cr b/src/invidious/helpers/utils.cr
index a006d602..e54aa0a7 100644
--- a/src/invidious/helpers/utils.cr
+++ b/src/invidious/helpers/utils.cr
@@ -445,3 +445,78 @@ def parse_link_endpoint(endpoint : JSON::Any, text : String, video_id : String)
   end
   return text
 end
+
+def totp_validator(env)
+  locale = LOCALES[env.get("preferences").as(Preferences).locale]?
+  referer = get_referer(env)
+
+  email = env.params.body["email"]?.try &.downcase.byte_slice(0, 254)
+  password = env.params.body["password"]?
+  totp_code = env.params.body["totp_code"]?
+  user = PG_DB.query_one?("SELECT * FROM users WHERE email = $1", email, as: User)
+
+  if !totp_code
+    return error_template(401, translate(locale, "general-totp-empty-field"))
+  end
+
+  # Verify if possible
+  if token = env.params.body["csrf_token"]?
+    begin
+      validate_request(token, sid, env.request, HMAC_KEY, PG_DB, locale)
+    rescue ex
+      return error_template(400, ex)
+    end
+  end
+
+  totp_instance = CrOTP::TOTP.new(user.totp_secret)
+  if !totp_instance.verify(totp_code)
+    return error_template(401, translate(locale, "general-totp-invalid-code"))
+  end
+
+  if Kemal.config.ssl || CONFIG.https_only
+    secure = true
+  else
+    secure = false
+  end
+
+  # There are two routes we can go here.
+  # 1. Where the user is already logged in and is
+  # confirming an dangerous task.
+  # 2. The user is logging in.
+  #
+  # This can be detected by the hidden email and password parameter
+
+  # https://stackoverflow.com/a/574698
+  if email && password
+    # The rest of the login code.
+    if Crypto::Bcrypt::Password.new(user.password.not_nil!).verify(password.byte_slice(0, 55))
+      sid = Base64.urlsafe_encode(Random::Secure.random_bytes(32))
+      PG_DB.exec("INSERT INTO session_ids VALUES ($1, $2, $3)", sid, email, Time.utc)
+
+      if CONFIG.domain
+        env.response.cookies["SID"] = HTTP::Cookie.new(name: "SID", domain: "#{CONFIG.domain}", value: sid, expires: Time.utc + 2.years,
+          secure: secure, http_only: true)
+      else
+        env.response.cookies["SID"] = HTTP::Cookie.new(name: "SID", value: sid, expires: Time.utc + 2.years,
+          secure: secure, http_only: true)
+      end
+    else
+      return error_template(401, "Wrong username or password")
+    end
+
+    # Since this user has already registered, we don't want to overwrite their preferences
+    if env.request.cookies["PREFS"]?
+      cookie = env.request.cookies["PREFS"]
+      cookie.expires = Time.utc(1990, 1, 1)
+      env.response.cookies << cookie
+    end
+
+    env.redirect referer
+  else
+    if CONFIG.domain
+      env.response.cookies["2faVerified"] = HTTP::Cookie.new(name: "2faVerified", domain: "#{CONFIG.domain}", value: true, expires: Time.utc + 1.hours, secure: secure, http_only: true)
+    else
+      env.response.cookies["2faVerified"] = HTTP::Cookie.new(name: "2faVerified", value: true, expires: Time.utc + 1.hours, secure: secure, http_only: true)
+    end
+  end
+end
diff --git a/src/invidious/routes/account.cr b/src/invidious/routes/account.cr
index 9d930841..f3241057 100644
--- a/src/invidious/routes/account.cr
+++ b/src/invidious/routes/account.cr
@@ -1,5 +1,7 @@
 {% skip_file if flag?(:api_only) %}
 
+require "crotp"
+
 module Invidious::Routes::Account
   extend self
 
@@ -351,4 +353,137 @@ module Invidious::Routes::Account
       return "{}"
     end
   end
+
+  # -------------------
+  # 2fa through OTP handling
+  # -------------------
+  def setup_2fa_page(env)
+    locale = env.get("preferences").as(Preferences).locale
+
+    user = env.get? "user"
+    sid = env.get? "sid"
+    referer = get_referer(env)
+
+    user = user.as(User)
+    sid = sid.as(String)
+    csrf_token = generate_response(sid, {":setup_2fa"}, HMAC_KEY)
+
+    db_secret = Random::Secure.random_bytes(16).hexstring
+    totp = CrOTP::TOTP.new(db_secret)
+    user_secret = totp.base32_secret
+
+    return templated "user/setup_2fa"
+  end
+
+  # Setup TOTP (post) request.
+  def setup_2fa(env)
+    locale = env.get("preferences").as(Preferences).locale
+
+    user = env.get? "user"
+    sid = env.get? "sid"
+    referer = get_referer(env)
+
+    if !user
+      return env.redirect referer
+    end
+
+    user = user.as(User)
+    sid = sid.as(String)
+    token = env.params.body["csrf_token"]?
+
+    begin
+      validate_request(token, sid, env.request, HMAC_KEY, locale)
+    rescue ex
+      return error_template(400, ex)
+    end
+
+    totp_code = env.params.body["totp_code"]?
+    db_secret = env.params.body["db_secret"] # Must exist
+    if !totp_code
+      return error_template(401, translate(locale, "general-totp-empty-field"))
+    end
+
+    totp_instance = CrOTP::TOTP.new(db_secret)
+    if !totp_instance.verify(totp_code)
+      return error_template(401, translate(locale, "general-totp-invalid-code"))
+    end
+
+    PG_DB.exec("UPDATE users SET totp_secret = $1 WHERE email = $2", db_secret.to_s, user.email)
+  end
+
+  # Validate 2fa code endpoint
+  def validate_2fa(env)
+    locale = env.get("preferences").as(Preferences).locale
+    referer = get_referer(env)
+
+    email = env.params.body["email"]?.try &.downcase.byte_slice(0, 254)
+    password = env.params.body["password"]?
+    totp_code = env.params.body["totp_code"]?
+    # This endpoint is only called when the user has a totp_secret.
+    user = PG_DB.query_one?("SELECT * FROM users WHERE email = $1", email, as: User).not_nil!
+
+    if !totp_code
+      return error_template(401, translate(locale, "general-totp-empty-field"))
+    end
+
+    totp_instance = CrOTP::TOTP.new(user.totp_secret.not_nil!)
+    if !totp_instance.verify(totp_code)
+      return error_template(401, translate(locale, "general-totp-invalid-code"))
+    end
+
+    if Kemal.config.ssl || CONFIG.https_only
+      secure = true
+    else
+      secure = false
+    end
+
+    # There are two routes we can go here.
+    # 1. Where the user is already logged in and is
+    # confirming an dangerous task.
+    # 2. The user is logging in.
+    #
+    # This can be detected by the hidden email and password parameter
+
+    # https://stackoverflow.com/a/574698
+    if email && password
+      # The rest of the login code.
+      if Crypto::Bcrypt::Password.new(user.password.not_nil!).verify(password.byte_slice(0, 55))
+        sid = Base64.urlsafe_encode(Random::Secure.random_bytes(32))
+        PG_DB.exec("INSERT INTO session_ids VALUES ($1, $2, $3)", sid, email, Time.utc)
+
+        if CONFIG.domain
+          env.response.cookies["SID"] = HTTP::Cookie.new(name: "SID", domain: "#{CONFIG.domain}", value: sid, expires: Time.utc + 2.years,
+            secure: secure, http_only: true)
+        else
+          env.response.cookies["SID"] = HTTP::Cookie.new(name: "SID", value: sid, expires: Time.utc + 2.years,
+            secure: secure, http_only: true)
+        end
+      else
+        return error_template(401, "Wrong username or password")
+      end
+
+      # Since this user has already registered, we don't want to overwrite their preferences
+      if env.request.cookies["PREFS"]?
+        cookie = env.request.cookies["PREFS"]
+        cookie.expires = Time.utc(1990, 1, 1)
+        env.response.cookies << cookie
+      end
+
+      env.redirect referer
+    else
+      token = env.params.body["csrf_token"]
+
+      begin
+        validate_request(token, env.get?("sid").as(String), env.request, HMAC_KEY, locale)
+      rescue ex
+        return error_template(400, ex)
+      end
+
+      if CONFIG.domain
+        env.response.cookies["2faVerified"] = HTTP::Cookie.new(name: "2faVerified", domain: "#{CONFIG.domain}", value: "1", expires: Time.utc + 1.hours, secure: secure, http_only: true)
+      else
+        env.response.cookies["2faVerified"] = HTTP::Cookie.new(name: "2faVerified", value: "1", expires: Time.utc + 1.hours, secure: secure, http_only: true)
+      end
+    end
+  end
 end
diff --git a/src/invidious/routes/login.cr b/src/invidious/routes/login.cr
index d0f7ac22..44aea163 100644
--- a/src/invidious/routes/login.cr
+++ b/src/invidious/routes/login.cr
@@ -56,6 +56,12 @@ module Invidious::Routes::Login
       user = Invidious::Database::Users.select(email: email)
 
       if user
+        # If user has setup TOTP
+        if user.totp_secret
+          csrf_token = nil # setting this to false for compatibility reasons.
+          return templated "user/validate_2fa"
+        end
+
         if Crypto::Bcrypt::Password.new(user.password.not_nil!).verify(password.byte_slice(0, 55))
           sid = Base64.urlsafe_encode(Random::Secure.random_bytes(32))
           Invidious::Database::SessionIDs.insert(sid, email)
diff --git a/src/invidious/routing.cr b/src/invidious/routing.cr
index 9c43171c..fc21f976 100644
--- a/src/invidious/routing.cr
+++ b/src/invidious/routing.cr
@@ -78,6 +78,11 @@ module Invidious::Routing
     post "/token_ajax", Routes::Account, :token_ajax
     post "/subscription_ajax", Routes::Subscriptions, :toggle_subscription
     get "/subscription_manager", Routes::Subscriptions, :subscription_manager
+
+    # 2fa routes
+    Invidious::Routing.get "/setup_2fa", Routes::Account, :setup_2fa_page
+    Invidious::Routing.post "/setup_2fa", Routes::Account, :setup_2fa
+    Invidious::Routing.post "/validate_2fa", Routes::Account, :validate_2fa
   end
 
   def register_iv_playlist_routes
diff --git a/src/invidious/views/user/preferences.ecr b/src/invidious/views/user/preferences.ecr
index dfda1434..a0f77dbf 100644
--- a/src/invidious/views/user/preferences.ecr
+++ b/src/invidious/views/user/preferences.ecr
@@ -345,6 +345,10 @@
                     <a href="/feed/history"><%= translate(locale, "Watch history") %></a>
                 </div>
 
+                <div class="pure-control-group">
+                    <a href="/setup_2fa?referer=<%= URI.encode_www_form(referer) %>"><%= translate(locale, "setup-totp-form-header") %></a>
+                </div>
+
                 <div class="pure-control-group">
                     <a href="/delete_account?referer=<%= URI.encode_www_form(referer) %>"><%= translate(locale, "Delete account") %></a>
                 </div>
diff --git a/src/invidious/views/user/setup_2fa.ecr b/src/invidious/views/user/setup_2fa.ecr
new file mode 100644
index 00000000..a22e5f0b
--- /dev/null
+++ b/src/invidious/views/user/setup_2fa.ecr
@@ -0,0 +1,36 @@
+<% content_for "header" do %>
+<title><%= translate(locale, "setup-totp-form-header") %> - Invidious</title>
+<% end %>
+
+<div class="pure-g">
+    <div class="pure-u-1 pure-u-lg-1-5"></div>
+    <div class="pure-u-1 pure-u-lg-3-5">
+        <div class="h-box">
+            <form class="pure-form pure-form-aligned" action="/setup_2fa?referer=<%= URI.encode_www_form(referer) %>" method="post">
+                <legend><%= translate(locale, "setup-totp-form-header") %></legend>
+                <fieldset>
+
+                <input name="db_secret" type="hidden" value="<%= HTML.escape(db_secret) %>">
+
+                <ol style="word-wrap: anywhere; white-space: break-space;">
+                    <li> <%= translate(locale, "setup-totp-instructions-download-auth") %> </li>
+                    <li> <%= translate(locale, "setup-totp-instructions-enter-code") %> 
+                    <code> <%=user_secret%> </code>
+                    </li>
+                    <li> <%= translate(locale, "setup-totp-instructions-validate-code") %> </li>
+                </ol>
+
+                <input required class="pure-input-1" name="totp_code" placeholder="<%= translate(locale, "general-totp-enter-code-field") %>">
+
+                <input type="hidden" name="csrf_token" value="<%= URI.encode_www_form(csrf_token) %>">
+
+                <button type="submit" name="action" value="setup-totp-form-header" class="pure-button pure-button-primary">
+                    <%= translate(locale, "setup-totp-submit-button") %>
+                </button>
+
+                </fieldset>
+            </form>
+        </div>
+    </div>
+    <div class="pure-u-1 pure-u-lg-1-5"></div>
+</div>
diff --git a/src/invidious/views/user/validate_2fa.ecr b/src/invidious/views/user/validate_2fa.ecr
new file mode 100644
index 00000000..3e477689
--- /dev/null
+++ b/src/invidious/views/user/validate_2fa.ecr
@@ -0,0 +1,37 @@
+<% content_for "header" do %>
+<title><%= translate(locale, "setup-totp-form-header") %> - Invidious</title>
+<% end %>
+
+<div class="pure-g">
+    <div class="pure-u-1 pure-u-lg-1-5"></div>
+    <div class="pure-u-1 pure-u-lg-3-5">
+        <div class="h-box">
+            <form class="pure-form pure-form-aligned" action="/validate_2fa?referer=<%= URI.encode_www_form(referer) %>" method="post">
+                <legend><%= translate(locale, "general-totp-enter-code-header") %></legend>
+                <fieldset>
+                
+                <!-- Hidden fields used for sign-in authentication-->
+                <% if email %>
+                    <input name="email" type="hidden" value="<%= email %>">
+                <% end %>
+                <% if password %>
+                    <input name="password" type="hidden" value="<%= HTML.escape(password) %>">
+                <% end %>
+
+                <input required class="pure-input-1" name="totp_code" placeholder="<%= translate(locale, "general-totp-enter-code-field") %>">
+
+                <% if csrf_token %>
+                    <input type="hidden" name="csrf_token" value="<%= URI.encode_www_form(csrf_token) %>">
+                <% end %>
+
+
+                <button type="submit" name="action" class="pure-button pure-button-primary">
+                    <%= translate(locale, "general-totp-verify-button") %>
+                </button>
+
+                </fieldset>
+            </form>
+        </div>
+    </div>
+    <div class="pure-u-1 pure-u-lg-1-5"></div>
+</div>