diff --git a/app/models/profile.rb b/app/models/profile.rb
index 7801fe838..c42a1cfb9 100644
--- a/app/models/profile.rb
+++ b/app/models/profile.rb
@@ -3,6 +3,7 @@ class Profile < ApplicationRecord
 
   validates :user_id, uniqueness: true
   validates :location, :website_url, length: { maximum: 100 }
+  validates :website_url, url: { allow_blank: true, no_local: true, schemes: %w[https http] }
   validates_with ProfileValidator
 
   # Static fields are columns on the profiles table; they have no relationship
diff --git a/app/views/users/_profile.html.erb b/app/views/users/_profile.html.erb
index dc1a690ac..03f538860 100644
--- a/app/views/users/_profile.html.erb
+++ b/app/views/users/_profile.html.erb
@@ -50,7 +50,7 @@
       <label class="crayons-field__label" for="profile[website_url]">
         Website URL
       </label>
-      <%= f.text_field "profile[website_url]",
+      <%= f.url_field "profile[website_url]",
                        value: profile.website_url,
                        placeholder: "https://yoursite.com",
                        class: "crayons-textfield js-color-field" %>
diff --git a/lib/data_update_scripts/20210722135549_profile_website_url_format.rb b/lib/data_update_scripts/20210722135549_profile_website_url_format.rb
new file mode 100644
index 000000000..a6d9e5c9f
--- /dev/null
+++ b/lib/data_update_scripts/20210722135549_profile_website_url_format.rb
@@ -0,0 +1,29 @@
+module DataUpdateScripts
+  class ProfileWebsiteUrlFormat
+    def run
+      profiles_to_fix.each do |profile|
+        fix_or_clear_website_url(profile)
+        profile.save || log_failure(profile)
+      end
+    end
+
+    def fix_or_clear_website_url(profile)
+      profile.website_url =
+        begin
+          new_url = "https://#{profile.website_url}"
+          uri = URI.parse(new_url)
+          uri.scheme.present? && uri.host.present? && new_url || ""
+        end
+    end
+
+    def log_failure(profile)
+      Rails.logger.warn("Attempted to update website_url for profile #{profile.id} but failed with #{profile.errors}")
+    end
+
+    def profiles_to_fix
+      Profile
+        .where.not("website_url like 'http__/%'")
+        .where.not(website_url: [nil, ""])
+    end
+  end
+end
diff --git a/spec/lib/data_update_scripts/profile_website_url_format_spec.rb b/spec/lib/data_update_scripts/profile_website_url_format_spec.rb
new file mode 100644
index 000000000..1238de366
--- /dev/null
+++ b/spec/lib/data_update_scripts/profile_website_url_format_spec.rb
@@ -0,0 +1,48 @@
+require "rails_helper"
+require Rails.root.join(
+  "lib/data_update_scripts/20210722135549_profile_website_url_format.rb",
+)
+
+describe DataUpdateScripts::ProfileWebsiteUrlFormat do
+  let(:nil_profile) { create(:profile, website_url: nil) }
+  let(:empty_profile) { create(:profile, website_url: "") }
+  let(:valid_profile) { create(:profile, website_url: "https://www.example.com") }
+
+  let(:invalid_profile) do
+    build(:profile, website_url: "www.example.com").tap do |profile|
+      profile.save(validate: false)
+    end
+  end
+
+  let(:unfixable_profile) do
+    build(:profile, website_url: "/local.html").tap do |profile|
+      profile.save(validate: false)
+    end
+  end
+
+  it "does not modify profiles where website url is null" do
+    expect { described_class.new.run }.not_to change(nil_profile, :website_url)
+  end
+
+  it "does not modify profiles where website url is empty" do
+    expect { described_class.new.run }.not_to change(empty_profile, :website_url)
+  end
+
+  it "does not modify profiles where website url is valid" do
+    expect { described_class.new.run }.not_to change(valid_profile, :website_url)
+  end
+
+  it "prepends https:// to invalid urls to make a valid url from hostnames" do
+    expect { described_class.new.run }
+      .to change { invalid_profile.reload.website_url }
+      .from("www.example.com")
+      .to("https://www.example.com")
+  end
+
+  it "clears websites that don't form valid urls by prepending" do
+    expect { described_class.new.run }
+      .to change { unfixable_profile.reload.website_url }
+      .from("/local.html")
+      .to("")
+  end
+end
diff --git a/spec/models/profile_spec.rb b/spec/models/profile_spec.rb
index d05a1a215..503509b98 100644
--- a/spec/models/profile_spec.rb
+++ b/spec/models/profile_spec.rb
@@ -57,6 +57,23 @@ RSpec.describe Profile, type: :model do
         expect(profile.errors_as_sentence).to eq "Location is too long (maximum is 100 characters)"
       end
     end
+
+    describe "validating website_url" do
+      it "is valid if blank" do
+        profile.website_url = nil
+        expect(profile).to be_valid
+      end
+      it "is valid with a complete url" do
+        profile.website_url = "https://dev.to"
+        expect(profile).to be_valid
+      end
+
+      it "is invalid with an incomplete url" do
+        profile.website_url = "dev.to"
+        expect(profile).not_to be_valid
+        expect(profile.errors_as_sentence).to eq "Website url is not a valid URL"
+      end
+    end
   end
 
   context "when accessing profile fields" do