diff --git a/.gitignore b/.gitignore
index 0bd1163..8eb4757 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@
 /.local
 __pycache__
 /snikket_web/static/css/*.css
+/snikket_web/translations/messages.pot
+/snikket_web/translations/*/LC_MESSAGES/*.mo
diff --git a/Makefile b/Makefile
index ca09a10..2c37075 100644
--- a/Makefile
+++ b/Makefile
@@ -2,9 +2,14 @@ scss_files = $(filter-out snikket_web/scss/_%.scss,$(wildcard snikket_web/scss/*
 scss_includes = $(filter snikket_web/scss/_%.scss,$(wildcard snikket_web/scss/*.scss))
 generated_css_files = $(patsubst snikket_web/scss/%.scss,snikket_web/static/css/%.css,$(scss_files))
 
+translation_basepath = snikket_web/translations
+pot_file = $(translation_basepath)/messages.pot
+
 PYTHON3 ?= python3
 SCSSC ?= $(PYTHON3) -m scss --load-path snikket_web/scss/
 
+all: build_css compile_translations
+
 build_css: $(generated_css_files)
 
 $(generated_css_files): snikket_web/static/css/%.css: snikket_web/scss/%.scss $(scss_includes)
@@ -13,4 +18,12 @@ $(generated_css_files): snikket_web/static/css/%.css: snikket_web/scss/%.scss $(
 clean:
 	rm -f $(generated_css_files)
 
-.PHONY: build_css clean
+update_translations:
+	pybabel extract -F babel.cfg -k _l -o $(pot_file) .
+	pybabel update -i $(pot_file) -d $(translation_basepath)
+
+compile_translations:
+	pybabel compile -d $(translation_basepath)
+
+
+.PHONY: build_css clean update_translations compile_translations
diff --git a/babel.cfg b/babel.cfg
new file mode 100644
index 0000000..9ba026f
--- /dev/null
+++ b/babel.cfg
@@ -0,0 +1,3 @@
+[python: snikket_web/**.py]
+[jinja2: snikket_web/templates/**.html]
+extensions=jinja2.ext.autoescape,jinja2.ext.with_
diff --git a/requirements.txt b/requirements.txt
index 76e75ef..9328045 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ aiohttp~=3.6
 quart~=0.11
 flask-wtf~=0.14
 hsluv~=0.0.2
+flask-babel~=1.0
diff --git a/snikket_web/__init__.py b/snikket_web/__init__.py
index 0102895..958c29c 100644
--- a/snikket_web/__init__.py
+++ b/snikket_web/__init__.py
@@ -10,17 +10,29 @@ from quart import (
     current_app,
 )
 
+from flask_babel import Babel
+
 from . import colour
 from .prosodyclient import client
 
 from ._version import version, version_info
 
 app = Quart(__name__)
+app.config.setdefault("LANGUAGES", ["de", "en"])
 app.config.from_envvar("SNIKKET_WEB_CONFIG")
 
 client.init_app(app)
 client.default_login_redirect = "login"
 
+babel = Babel(app)
+
+
+@babel.localeselector
+def select_locale():
+    return request.accept_languages.best_match(
+        current_app.config['LANGUAGES']
+    )
+
 
 @app.route("/login", methods=["GET", "POST"])
 async def login():
diff --git a/snikket_web/templates/app.html b/snikket_web/templates/app.html
index 3015e5c..237a6dc 100644
--- a/snikket_web/templates/app.html
+++ b/snikket_web/templates/app.html
@@ -15,6 +15,6 @@
 </div>
 <main>{% block content %}{% endblock %}</main>
 <footer>
-	<ul><li>A <a href="{{ url_for('about') }}">Snikket</a> server</li></ul>
+	<ul><li>{% trans about_url=url_for('about') %}A <a href="{{ about_url }}">Snikket</a> server{% endtrans %}</li></ul>
 </footer>
 {% endblock %}
diff --git a/snikket_web/templates/login.html b/snikket_web/templates/login.html
index fdff05a..f94878b 100644
--- a/snikket_web/templates/login.html
+++ b/snikket_web/templates/login.html
@@ -1,7 +1,7 @@
 {% extends "base.html" %}
 {% set body_id = "login" %}
 {% block head_lead %}
-<title>Snikket Web Portal</title>
+<title>{{ _("Snikket Login") }}</title>
 {% endblock %}
 {% block style %}
 <link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='css/app.css') }}">
@@ -10,22 +10,22 @@
 {% block body %}
 <main><div class="form layout-expanded">
 	<h1 class="form-title">{{ config["SNIKKET_DOMAIN"] }}</h1>
-	<p class="form-desc">Enter your Snikket address and password to manage your account.</p>
+	<p class="form-desc">{{ _("Enter your Snikket address and password to manage your account.") }}</p>
 	<form method="POST" action="{{ url_for('login') }}" name="login">
 		<div class="f-ebox">
-			<label for="address" class="a11y-only">Address:</label>
-			<input type="text" name="address" id="address" required="required" placeholder="Address">
+			<label for="address" class="a11y-only">{{ _("Address") }}:</label>
+			<input type="text" name="address" id="address" required="required" placeholder="{{ _("Address") }}">
 		</div>
 		<div class="f-ebox">
-			<label for="password" class="a11y-only"`>Password:</label>
-			<input type="password" name="password" required="required" placeholder="Password">
+			<label for="password" class="a11y-only">{{ _("Password") }}:</label>
+			<input type="password" name="password" id="password" required="required" placeholder="{{ _("Password") }}">
 		</div>
 		<div class="f-bbox">
-			<button type="submit" class="primary">Login</button>
+			<button type="submit" class="primary">{{ _("Log in") }}</button>
 		</div>
 	</from>
 </div></main>
 <footer>
-	<ul><li>A <a href="{{ url_for('about') }}">Snikket</a> server</li></ul>
+	<ul><li>{% trans about_url=url_for('about') %}A <a href="{{ about_url }}">Snikket</a> server{% endtrans %}</li></ul>
 </footer>
 {% endblock %}
diff --git a/snikket_web/templates/user_home.html b/snikket_web/templates/user_home.html
index 3c7795b..2723a7a 100644
--- a/snikket_web/templates/user_home.html
+++ b/snikket_web/templates/user_home.html
@@ -1,19 +1,18 @@
 {% extends "app.html" %}
 {% block content %}
-<h1>Welcome!</h1>
-<p>Welcome home, {{ user_info.display_name }}.</p>
+<h1>{% trans %}Welcome!{% endtrans %}</h1>
+<p>{% trans user_name=user_info.display_name %}Welcome home, {{ user_name }}.{% endtrans %}</p>
 <div class="welcome-cards">
 	<a class="card" href="{{ url_for('user.profile') }}">
-		<h2>Update profile</h2>
-		<p>Change display name, set avatar and configure visibility of your
-		personal data to others.</p>
+		<h2>{% trans %}Update profile{% endtrans %}</h2>
+		<p>{% trans %}Change display name, set avatar and configure visibility of your personal data to others.{% endtrans %}</p>
 	</a>
 	<a class="card" href="{{ url_for('user.change_pw') }}">
-		<h2>Change password</h2>
+		<h2>{% trans %}Change password{% endtrans %}</h2>
 	</a>
 	<a class="card" href="{{ url_for('user.logout') }}">
-		<h2>Log out</h2>
-		<p>Exit the Snikket Web Portal, without logging out your other devices.</p>
+		<h2>{% trans %}Log out{% endtrans %}</h2>
+		<p>{% trans %}Exit the Snikket Web Portal, without logging out your other devices.{% endtrans %}</p>
 	</a>
 </div>
 {% endblock %}
diff --git a/snikket_web/templates/user_passwd.html b/snikket_web/templates/user_passwd.html
index d13e472..f36f552 100644
--- a/snikket_web/templates/user_passwd.html
+++ b/snikket_web/templates/user_passwd.html
@@ -4,12 +4,12 @@
 {% endblock %}
 {% block content %}
 <div class="form layout-expanded"><form method="POST">
-	<h2 class="form-title">Change your password</h2>
-	<p class="form-desc weak">To change your password, you need to provide the current password as well as the new one. To reduce the chance of typos, we ask for your new password twice.</p>
+	<h2 class="form-title">{% trans %}Change your password{% endtrans %}</h2>
+	<p class="form-desc weak">{% trans %}To change your password, you need to provide the current password as well as the new one. To reduce the chance of typos, we ask for your new password twice.{% endtrans %}</p>
 	{{ form.csrf_token }}
 	{% if form.errors %}
 	<div class="box alert">
-		<header>Password change failed</header>
+		<header>{% trans %}Password change failed{% endtrans %}</header>
 		<ul>
 		{% for field, errors in form.errors.items() %}
 		{% for error in errors %}
@@ -32,8 +32,8 @@
 		{{ form.new_password_confirm(class=("has-error" if form.new_password_confirm.name in form.errors else "")) }}
 	</div>
 	<div class="f-bbox">
-		<a href="{{ url_for('user.index') }}" class="button secondary">Back</a>
-		<button type="submit" class="primary">Change password</button>
+		<a href="{{ url_for('user.index') }}" class="button secondary">{% trans %}Back{% endtrans %}</a>
+		<button type="submit" class="primary">{% trans %}Change password{% endtrans %}</button>
 	</div>
 </form></div>
 {% endblock %}
diff --git a/snikket_web/templates/user_profile.html b/snikket_web/templates/user_profile.html
index d790f2e..3c079cf 100644
--- a/snikket_web/templates/user_profile.html
+++ b/snikket_web/templates/user_profile.html
@@ -4,7 +4,7 @@
 {% endblock %}
 {% block content %}
 <div class="form layout-expanded"><form method="POST" enctype="multipart/form-data">
-	<h2 class="form-title">Profile</h2>
+	<h2 class="form-title">{% trans %}Profile{% endtrans %}</h2>
 	{{ form.csrf_token }}
 	<div class="f-ebox">
 		{{ form.nickname.label }}
@@ -15,7 +15,7 @@
 		{{ form.avatar }}
 	</div>
 	<div class="f-bbox">
-		<a href="{{ url_for('user.index') }}" class="button secondary">Back</a><button type="submit" class="primary">Update</button>
+		<a href="{{ url_for('user.index') }}" class="button secondary">{% trans %}Back{% endtrans %}</a><button type="submit" class="primary">{% trans %}Apply{% endtrans %}</button>
 	</div>
 </form></div>
 {% endblock %}
diff --git a/snikket_web/translations/de/LC_MESSAGES/messages.po b/snikket_web/translations/de/LC_MESSAGES/messages.po
new file mode 100644
index 0000000..26721b8
--- /dev/null
+++ b/snikket_web/translations/de/LC_MESSAGES/messages.po
@@ -0,0 +1,140 @@
+# German translations for SnikketWeb.
+# Copyright (C) 2020 ORGANIZATION
+# This file is distributed under the same license as the SnikketWeb project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2020.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: SnikketWeb 0.1.0\n"
+"Report-Msgid-Bugs-To: jonas@zombofant.net\n"
+"POT-Creation-Date: 2020-03-07 16:53+0100\n"
+"PO-Revision-Date: 2020-03-07 16:32+0100\n"
+"Last-Translator: Jonas Schäfer <jonas@zombofant.net>\n"
+"Language: de\n"
+"Language-Team: de <LL@li.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.8.0\n"
+
+#: snikket_web/templates/app.html:18 snikket_web/templates/login.html:29
+#, python-format
+msgid "A <a href=\"%(about_url)s\">Snikket</a> server"
+msgstr "Ein <a href=\"%(about_url)s\">Snikket</a>-Server"
+
+#: snikket_web/templates/login.html:4
+msgid "Snikket Login"
+msgstr "Snikket Anmeldung"
+
+#: snikket_web/templates/login.html:13
+msgid "Enter your Snikket address and password to manage your account."
+msgstr "Gib deine Snikket-Adresse und -Passwort ein um dein Konto zu verwalten."
+
+#: snikket_web/templates/login.html:16 snikket_web/templates/login.html:17
+msgid "Address"
+msgstr "Adresse"
+
+#: snikket_web/templates/login.html:20 snikket_web/templates/login.html:21
+msgid "Password"
+msgstr "Passwort"
+
+#: snikket_web/templates/login.html:24
+msgid "Log in"
+msgstr "Anmelden"
+
+#: snikket_web/templates/user_home.html:3
+msgid "Welcome!"
+msgstr "Willkommen!"
+
+#: snikket_web/templates/user_home.html:4
+#, python-format
+msgid "Welcome home, %(user_name)s."
+msgstr "Willkommen zu Hause, %(user_name)s."
+
+#: snikket_web/templates/user_home.html:7
+msgid "Update profile"
+msgstr "Profil bearbeiten"
+
+#: snikket_web/templates/user_home.html:8
+msgid ""
+"Change display name, set avatar and configure visibility of your personal"
+" data to others."
+msgstr ""
+"Ändere deinen Namen oder dein Bild und wer deine persönlichen Daten "
+"einsehen kann."
+
+#: snikket_web/templates/user_home.html:11
+#: snikket_web/templates/user_passwd.html:36
+msgid "Change password"
+msgstr "Passwort ändern"
+
+#: snikket_web/templates/user_home.html:14
+msgid "Log out"
+msgstr "Abmelden"
+
+#: snikket_web/templates/user_home.html:15
+msgid "Exit the Snikket Web Portal, without logging out your other devices."
+msgstr ""
+"Verlasse das Snikket Web-Portal, ohne dass deine anderen Geräte "
+"beeinträchtigt werden."
+
+#: snikket_web/templates/user_passwd.html:7
+msgid "Change your password"
+msgstr "Ändere dein Passwort"
+
+#: snikket_web/templates/user_passwd.html:8
+msgid ""
+"To change your password, you need to provide the current password as well"
+" as the new one. To reduce the chance of typos, we ask for your new "
+"password twice."
+msgstr ""
+"Um dein Passwort zu ändern musst du sowohl dein aktuelles Passwort "
+"alsauch dein neues Passwort angeben. Damit Tippfehler dich nicht "
+"aussperren bitten wir dich, dein neues Passwort zweimal einzutippen."
+
+#: snikket_web/templates/user_passwd.html:12
+msgid "Password change failed"
+msgstr "Passwortänderung fehlgeschlagen"
+
+#: snikket_web/templates/user_passwd.html:35
+#: snikket_web/templates/user_profile.html:18
+msgid "Back"
+msgstr "Zurück"
+
+#: snikket_web/templates/user_profile.html:7
+msgid "Profile"
+msgstr "Profil"
+
+#: snikket_web/templates/user_profile.html:18
+msgid "Apply"
+msgstr "Übernehmen"
+
+#: snikket_web/user/__init__.py:21
+msgid "Current password"
+msgstr "Aktuelles Passwort"
+
+#: snikket_web/user/__init__.py:26
+msgid "New password"
+msgstr "Neues Passwort"
+
+#: snikket_web/user/__init__.py:31
+msgid "Confirm new password"
+msgstr "Neues Passwort (Bestätigung)"
+
+#: snikket_web/user/__init__.py:35
+msgid "The new passwords must match."
+msgstr "Die neuen Passwörter müssen übereinstimmen."
+
+#: snikket_web/user/__init__.py:46
+msgid "Display name"
+msgstr "Anzeigename"
+
+#: snikket_web/user/__init__.py:50
+msgid "Avatar"
+msgstr "Bild"
+
+#: snikket_web/user/__init__.py:74
+msgid "Incorrect password"
+msgstr "Ungültiges Passwort"
+
diff --git a/snikket_web/translations/en/LC_MESSAGES/messages.po b/snikket_web/translations/en/LC_MESSAGES/messages.po
new file mode 100644
index 0000000..c6a9556
--- /dev/null
+++ b/snikket_web/translations/en/LC_MESSAGES/messages.po
@@ -0,0 +1,138 @@
+# English translations for PROJECT.
+# Copyright (C) 2020 ORGANIZATION
+# This file is distributed under the same license as the PROJECT project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2020.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PROJECT VERSION\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2020-03-07 16:53+0100\n"
+"PO-Revision-Date: 2020-03-07 16:50+0100\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en\n"
+"Language-Team: en <LL@li.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.8.0\n"
+
+#: snikket_web/templates/app.html:18 snikket_web/templates/login.html:29
+#, python-format
+msgid "A <a href=\"%(about_url)s\">Snikket</a> server"
+msgstr "A <a href=\"%(about_url)s\">Snikket</a> server"
+
+#: snikket_web/templates/login.html:4
+msgid "Snikket Login"
+msgstr "Snikket Login"
+
+#: snikket_web/templates/login.html:13
+msgid "Enter your Snikket address and password to manage your account."
+msgstr "Enter your Snikket address and password to manage your account."
+
+#: snikket_web/templates/login.html:16 snikket_web/templates/login.html:17
+msgid "Address"
+msgstr "Address"
+
+#: snikket_web/templates/login.html:20 snikket_web/templates/login.html:21
+msgid "Password"
+msgstr "Password"
+
+#: snikket_web/templates/login.html:24
+msgid "Log in"
+msgstr "Log in"
+
+#: snikket_web/templates/user_home.html:3
+msgid "Welcome!"
+msgstr "Welcome!"
+
+#: snikket_web/templates/user_home.html:4
+#, python-format
+msgid "Welcome home, %(user_name)s."
+msgstr "Welcome home, %(user_name)s."
+
+#: snikket_web/templates/user_home.html:7
+msgid "Update profile"
+msgstr "Update profile"
+
+#: snikket_web/templates/user_home.html:8
+msgid ""
+"Change display name, set avatar and configure visibility of your personal"
+" data to others."
+msgstr ""
+"Change display name, set avatar and configure visibility of your personal"
+" data to others."
+
+#: snikket_web/templates/user_home.html:11
+#: snikket_web/templates/user_passwd.html:36
+msgid "Change password"
+msgstr "Change password"
+
+#: snikket_web/templates/user_home.html:14
+msgid "Log out"
+msgstr "Log out"
+
+#: snikket_web/templates/user_home.html:15
+msgid "Exit the Snikket Web Portal, without logging out your other devices."
+msgstr "Exit the Snikket Web Portal, without logging out your other devices."
+
+#: snikket_web/templates/user_passwd.html:7
+msgid "Change your password"
+msgstr "Change your password"
+
+#: snikket_web/templates/user_passwd.html:8
+msgid ""
+"To change your password, you need to provide the current password as well"
+" as the new one. To reduce the chance of typos, we ask for your new "
+"password twice."
+msgstr ""
+"To change your password, you need to provide the current password as well"
+" as the new one. To reduce the chance of typos, we ask for your new "
+"password twice."
+
+#: snikket_web/templates/user_passwd.html:12
+msgid "Password change failed"
+msgstr "Password change failed"
+
+#: snikket_web/templates/user_passwd.html:35
+#: snikket_web/templates/user_profile.html:18
+msgid "Back"
+msgstr "Back"
+
+#: snikket_web/templates/user_profile.html:7
+msgid "Profile"
+msgstr "Profile"
+
+#: snikket_web/templates/user_profile.html:18
+msgid "Apply"
+msgstr "Apply"
+
+#: snikket_web/user/__init__.py:21
+msgid "Current password"
+msgstr "Current password"
+
+#: snikket_web/user/__init__.py:26
+msgid "New password"
+msgstr "New password"
+
+#: snikket_web/user/__init__.py:31
+msgid "Confirm new password"
+msgstr "Confirm new password"
+
+#: snikket_web/user/__init__.py:35
+msgid "The new passwords must match."
+msgstr "The new passwords must match."
+
+#: snikket_web/user/__init__.py:46
+msgid "Display name"
+msgstr "Display name"
+
+#: snikket_web/user/__init__.py:50
+msgid "Avatar"
+msgstr "Avatar"
+
+#: snikket_web/user/__init__.py:74
+msgid "Incorrect password"
+msgstr "Incorrect password"
+
diff --git a/snikket_web/user/__init__.py b/snikket_web/user/__init__.py
index 88d80aa..a575ba0 100644
--- a/snikket_web/user/__init__.py
+++ b/snikket_web/user/__init__.py
@@ -3,6 +3,7 @@ import quart.flask_patch
 from quart import Blueprint, render_template, request, redirect, url_for
 import quart.exceptions
 from flask_wtf import FlaskForm
+from flask_babel import lazy_gettext as _l, _
 import wtforms
 
 from snikket_web.prosodyclient import client
@@ -17,25 +18,21 @@ async def proc():
 
 class ChangePasswordForm(FlaskForm):
     current_password = wtforms.PasswordField(
-        # TODO(i18n)
-        "Current password",
+        _l("Current password"),
         validators=[wtforms.validators.InputRequired()]
     )
 
     new_password = wtforms.PasswordField(
-        # TODO(i18n)
-        "New password",
+        _l("New password"),
         validators=[wtforms.validators.InputRequired()]
     )
 
     new_password_confirm = wtforms.PasswordField(
-        # TODO(i18n)
-        "Confirm new password",
+        _l("Confirm new password"),
         validators=[wtforms.validators.InputRequired(),
                     wtforms.validators.EqualTo(
                         "new_password",
-                        # TODO(i18n)
-                        "The new passwords must match."
+                        _l("The new passwords must match.")
                     )]
     )
 
@@ -46,11 +43,11 @@ class LogoutForm(FlaskForm):
 
 class ProfileForm(FlaskForm):
     nickname = wtforms.TextField(
-        "Display name",
+        _l("Display name"),
     )
 
     avatar = wtforms.FileField(
-        "Avatar"
+        _l("Avatar")
     )
 
 
@@ -74,8 +71,7 @@ async def change_pw():
         except quart.exceptions.Unauthorized:
             # server refused current password, set an appropriate error
             form.errors.setdefault(form.current_password.name, []).append(
-                # TODO(i18n)
-                "Incorrect password",
+                _("Incorrect password"),
             )
         else:
             return redirect(url_for("user.change_pw"))