diff --git a/src/components/views/settings/tabs/user/GeneralUserSettingsTab.js b/src/components/views/settings/tabs/user/GeneralUserSettingsTab.js
index 801062bff4..4e57203ca2 100644
--- a/src/components/views/settings/tabs/user/GeneralUserSettingsTab.js
+++ b/src/components/views/settings/tabs/user/GeneralUserSettingsTab.js
@@ -19,7 +19,6 @@ limitations under the License.
 import React from 'react';
 import {_t} from "../../../../../languageHandler";
 import ProfileSettings from "../../ProfileSettings";
-import Field from "../../../elements/Field";
 import * as languageHandler from "../../../../../languageHandler";
 import {SettingLevel} from "../../../../../settings/SettingsStore";
 import SettingsStore from "../../../../../settings/SettingsStore";
@@ -27,7 +26,6 @@ import LanguageDropdown from "../../../elements/LanguageDropdown";
 import AccessibleButton from "../../../elements/AccessibleButton";
 import DeactivateAccountDialog from "../../../dialogs/DeactivateAccountDialog";
 import PropTypes from "prop-types";
-import {enumerateThemes, ThemeWatcher} from "../../../../../theme";
 import PlatformPeg from "../../../../../PlatformPeg";
 import {MatrixClientPeg} from "../../../../../MatrixClientPeg";
 import * as sdk from "../../../../..";
@@ -60,9 +58,6 @@ export default class GeneralUserSettingsTab extends React.Component {
             },
             emails: [],
             msisdns: [],
-            ...this._calculateThemeState(),
-            customThemeUrl: "",
-            customThemeMessage: {isError: false, text: ""},
         };
 
         this.dispatcherRef = dis.register(this._onAction);
@@ -91,39 +86,6 @@ export default class GeneralUserSettingsTab extends React.Component {
         dis.unregister(this.dispatcherRef);
     }
 
-    _calculateThemeState() {
-        // We have to mirror the logic from ThemeWatcher.getEffectiveTheme so we
-        // show the right values for things.
-
-        const themeChoice = SettingsStore.getValueAt(SettingLevel.ACCOUNT, "theme");
-        const systemThemeExplicit = SettingsStore.getValueAt(
-            SettingLevel.DEVICE, "use_system_theme", null, false, true);
-        const themeExplicit = SettingsStore.getValueAt(
-            SettingLevel.DEVICE, "theme", null, false, true);
-
-        // If the user has enabled system theme matching, use that.
-        if (systemThemeExplicit) {
-            return {
-                theme: themeChoice,
-                useSystemTheme: true,
-            };
-        }
-
-        // If the user has set a theme explicitly, use that (no system theme matching)
-        if (themeExplicit) {
-            return {
-                theme: themeChoice,
-                useSystemTheme: false,
-            };
-        }
-
-        // Otherwise assume the defaults for the settings
-        return {
-            theme: themeChoice,
-            useSystemTheme: SettingsStore.getValueAt(SettingLevel.DEVICE, "use_system_theme"),
-        };
-    }
-
     _onAction = (payload) => {
         if (payload.action === 'id_server_changed') {
             this.setState({haveIdServer: Boolean(MatrixClientPeg.get().getIdentityServerUrl())});
@@ -214,33 +176,6 @@ export default class GeneralUserSettingsTab extends React.Component {
         PlatformPeg.get().reload();
     };
 
-    _onThemeChange = (e) => {
-        const newTheme = e.target.value;
-        if (this.state.theme === newTheme) return;
-
-        // doing getValue in the .catch will still return the value we failed to set,
-        // so remember what the value was before we tried to set it so we can revert
-        const oldTheme = SettingsStore.getValue('theme');
-        SettingsStore.setValue("theme", null, SettingLevel.ACCOUNT, newTheme).catch(() => {
-            dis.dispatch({action: 'recheck_theme'});
-            this.setState({theme: oldTheme});
-        });
-        this.setState({theme: newTheme});
-        // The settings watcher doesn't fire until the echo comes back from the
-        // server, so to make the theme change immediately we need to manually
-        // do the dispatch now
-        // XXX: The local echoed value appears to be unreliable, in particular
-        // when settings custom themes(!) so adding forceTheme to override
-        // the value from settings.
-        dis.dispatch({action: 'recheck_theme', forceTheme: newTheme});
-    };
-
-    _onUseSystemThemeChanged = (checked) => {
-        this.setState({useSystemTheme: checked});
-        SettingsStore.setValue("use_system_theme", null, SettingLevel.DEVICE, checked);
-        dis.dispatch({action: 'recheck_theme'});
-    };
-
     _onPasswordChangeError = (err) => {
         // TODO: Figure out a design that doesn't involve replacing the current dialog
         let errMsg = err.error || "";
@@ -277,41 +212,6 @@ export default class GeneralUserSettingsTab extends React.Component {
         });
     };
 
-    _onAddCustomTheme = async () => {
-        let currentThemes = SettingsStore.getValue("custom_themes");
-        if (!currentThemes) currentThemes = [];
-        currentThemes = currentThemes.map(c => c); // cheap clone
-
-        if (this._themeTimer) {
-            clearTimeout(this._themeTimer);
-        }
-
-        try {
-            const r = await fetch(this.state.customThemeUrl);
-            const themeInfo = await r.json();
-            if (!themeInfo || typeof(themeInfo['name']) !== 'string' || typeof(themeInfo['colors']) !== 'object') {
-                this.setState({customThemeMessage: {text: _t("Invalid theme schema."), isError: true}});
-                return;
-            }
-            currentThemes.push(themeInfo);
-        } catch (e) {
-            console.error(e);
-            this.setState({customThemeMessage: {text: _t("Error downloading theme information."), isError: true}});
-            return; // Don't continue on error
-        }
-
-        await SettingsStore.setValue("custom_themes", null, SettingLevel.ACCOUNT, currentThemes);
-        this.setState({customThemeUrl: "", customThemeMessage: {text: _t("Theme added!"), isError: false}});
-
-        this._themeTimer = setTimeout(() => {
-            this.setState({customThemeMessage: {text: "", isError: false}});
-        }, 3000);
-    };
-
-    _onCustomThemeChange = (e) => {
-        this.setState({customThemeUrl: e.target.value});
-    };
-
     _renderProfileSection() {
         return (
             <div className="mx_SettingsTab_section">
@@ -391,77 +291,6 @@ export default class GeneralUserSettingsTab extends React.Component {
         );
     }
 
-    _renderThemeSection() {
-        const SettingsFlag = sdk.getComponent("views.elements.SettingsFlag");
-        const LabelledToggleSwitch = sdk.getComponent("views.elements.LabelledToggleSwitch");
-
-        const themeWatcher = new ThemeWatcher();
-        let systemThemeSection;
-        if (themeWatcher.isSystemThemeSupported()) {
-            systemThemeSection = <div>
-                <LabelledToggleSwitch
-                    value={this.state.useSystemTheme}
-                    label={SettingsStore.getDisplayName("use_system_theme")}
-                    onChange={this._onUseSystemThemeChanged}
-                />
-            </div>;
-        }
-
-        let customThemeForm;
-        if (SettingsStore.isFeatureEnabled("feature_custom_themes")) {
-            let messageElement = null;
-            if (this.state.customThemeMessage.text) {
-                if (this.state.customThemeMessage.isError) {
-                    messageElement = <div className='text-error'>{this.state.customThemeMessage.text}</div>;
-                } else {
-                    messageElement = <div className='text-success'>{this.state.customThemeMessage.text}</div>;
-                }
-            }
-            customThemeForm = (
-                <div className='mx_SettingsTab_section'>
-                    <form onSubmit={this._onAddCustomTheme}>
-                        <Field
-                            label={_t("Custom theme URL")}
-                            type='text'
-                            autoComplete="off"
-                            onChange={this._onCustomThemeChange}
-                            value={this.state.customThemeUrl}
-                        />
-                        <AccessibleButton
-                            onClick={this._onAddCustomTheme}
-                            type="submit" kind="primary_sm"
-                            disabled={!this.state.customThemeUrl.trim()}
-                        >{_t("Add theme")}</AccessibleButton>
-                        {messageElement}
-                    </form>
-                </div>
-            );
-        }
-
-        const themes = Object.entries(enumerateThemes())
-            .map(p => ({id: p[0], name: p[1]})); // convert pairs to objects for code readability
-        const builtInThemes = themes.filter(p => !p.id.startsWith("custom-"));
-        const customThemes = themes.filter(p => !builtInThemes.includes(p))
-            .sort((a, b) => a.name.localeCompare(b.name));
-        const orderedThemes = [...builtInThemes, ...customThemes];
-        return (
-            <div className="mx_SettingsTab_section mx_GeneralUserSettingsTab_themeSection">
-                <span className="mx_SettingsTab_subheading">{_t("Theme")}</span>
-                {systemThemeSection}
-                <Field label={_t("Theme")} element="select"
-                       value={this.state.theme} onChange={this._onThemeChange}
-                       disabled={this.state.useSystemTheme}
-                >
-                    {orderedThemes.map(theme => {
-                        return <option key={theme.id} value={theme.id}>{theme.name}</option>;
-                    })}
-                </Field>
-                {customThemeForm}
-                <SettingsFlag name="useCompactLayout" level={SettingLevel.ACCOUNT} />
-            </div>
-        );
-    }
-
     _renderDiscoverySection() {
         const SetIdServer = sdk.getComponent("views.settings.SetIdServer");
 
@@ -547,7 +376,6 @@ export default class GeneralUserSettingsTab extends React.Component {
                 {this._renderProfileSection()}
                 {this._renderAccountSection()}
                 {this._renderLanguageSection()}
-                {this._renderThemeSection()}
                 <div className="mx_SettingsTab_heading">{discoWarning} {_t("Discovery")}</div>
                 {this._renderDiscoverySection()}
                 {this._renderIntegrationManagerSection() /* Has its own title */}
diff --git a/src/components/views/settings/tabs/user/StyleUserSettingsTab.js b/src/components/views/settings/tabs/user/StyleUserSettingsTab.js
new file mode 100644
index 0000000000..5c68f214d4
--- /dev/null
+++ b/src/components/views/settings/tabs/user/StyleUserSettingsTab.js
@@ -0,0 +1,233 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import {_t} from "../../../../../languageHandler";
+import SettingsStore, {SettingLevel} from "../../../../../settings/SettingsStore";
+import * as sdk from "../../../../../index";
+import {enumerateThemes, ThemeWatcher} from "../../../../../theme";
+import Field from "../../../elements/Field";
+
+export default class StyleUserSettingsTab extends React.Component {
+    constructor() {
+        super();
+
+        this.state = {
+            fontSize: SettingsStore.getValue("font_size", null),
+            ...this._calculateThemeState(),
+            customThemeUrl: "",
+            customThemeMessage: {isError: false, text: ""},
+        }
+    }
+
+    _calculateThemeState() {
+        // We have to mirror the logic from ThemeWatcher.getEffectiveTheme so we
+        // show the right values for things.
+
+        const themeChoice = SettingsStore.getValueAt(SettingLevel.ACCOUNT, "theme");
+        const systemThemeExplicit = SettingsStore.getValueAt(
+            SettingLevel.DEVICE, "use_system_theme", null, false, true);
+        const themeExplicit = SettingsStore.getValueAt(
+            SettingLevel.DEVICE, "theme", null, false, true);
+
+        // If the user has enabled system theme matching, use that.
+        if (systemThemeExplicit) {
+            return {
+                theme: themeChoice,
+                useSystemTheme: true,
+            };
+        }
+
+        // If the user has set a theme explicitly, use that (no system theme matching)
+        if (themeExplicit) {
+            return {
+                theme: themeChoice,
+                useSystemTheme: false,
+            };
+        }
+
+        // Otherwise assume the defaults for the settings
+        return {
+            theme: themeChoice,
+            useSystemTheme: SettingsStore.getValueAt(SettingLevel.DEVICE, "use_system_theme"),
+        };
+    }
+
+    _onThemeChange = (e) => {
+        const newTheme = e.target.value;
+        if (this.state.theme === newTheme) return;
+
+        // doing getValue in the .catch will still return the value we failed to set,
+        // so remember what the value was before we tried to set it so we can revert
+        const oldTheme = SettingsStore.getValue('theme');
+        SettingsStore.setValue("theme", null, SettingLevel.ACCOUNT, newTheme).catch(() => {
+            dis.dispatch({action: 'recheck_theme'});
+            this.setState({theme: oldTheme});
+        });
+        this.setState({theme: newTheme});
+        // The settings watcher doesn't fire until the echo comes back from the
+        // server, so to make the theme change immediately we need to manually
+        // do the dispatch now
+        // XXX: The local echoed value appears to be unreliable, in particular
+        // when settings custom themes(!) so adding forceTheme to override
+        // the value from settings.
+        dis.dispatch({action: 'recheck_theme', forceTheme: newTheme});
+    };
+
+    _onUseSystemThemeChanged = (checked) => {
+        this.setState({useSystemTheme: checked});
+        SettingsStore.setValue("use_system_theme", null, SettingLevel.DEVICE, checked);
+        dis.dispatch({action: 'recheck_theme'});
+    };
+
+    _onFontSizeChanged = (size) => {
+        let parsed_size = isNaN(parseInt(size))?SettingsStore.getDefaultValue("font_size"):parseFloat(size);
+        this.setState({fontSize: parsed_size})
+        SettingsStore.setValue("font_size", null, SettingLevel.DEVICE, parsed_size)
+    };
+
+    _onAddCustomTheme = async () => {
+        let currentThemes = SettingsStore.getValue("custom_themes");
+        if (!currentThemes) currentThemes = [];
+        currentThemes = currentThemes.map(c => c); // cheap clone
+
+        if (this._themeTimer) {
+            clearTimeout(this._themeTimer);
+        }
+
+        try {
+            const r = await fetch(this.state.customThemeUrl);
+            const themeInfo = await r.json();
+            if (!themeInfo || typeof(themeInfo['name']) !== 'string' || typeof(themeInfo['colors']) !== 'object') {
+                this.setState({customThemeMessage: {text: _t("Invalid theme schema."), isError: true}});
+                return;
+            }
+            currentThemes.push(themeInfo);
+        } catch (e) {
+            console.error(e);
+            this.setState({customThemeMessage: {text: _t("Error downloading theme information."), isError: true}});
+            return; // Don't continue on error
+        }
+
+        await SettingsStore.setValue("custom_themes", null, SettingLevel.ACCOUNT, currentThemes);
+        this.setState({customThemeUrl: "", customThemeMessage: {text: _t("Theme added!"), isError: false}});
+
+        this._themeTimer = setTimeout(() => {
+            this.setState({customThemeMessage: {text: "", isError: false}});
+        }, 3000);
+    };
+
+    _onCustomThemeChange = (e) => {
+        this.setState({customThemeUrl: e.target.value});
+    };
+
+    render() {
+        return (
+            <div className="mx_SettingsTab">
+                <div className="mx_SettingsTab_heading">{_t("Style")}</div>
+                {this._renderThemeSection()}
+                {this._renderFontSection()}
+            </div>
+        );
+    }
+
+    _renderThemeSection() {
+        const SettingsFlag = sdk.getComponent("views.elements.SettingsFlag");
+        const LabelledToggleSwitch = sdk.getComponent("views.elements.LabelledToggleSwitch");
+
+        const themeWatcher = new ThemeWatcher();
+        let systemThemeSection;
+        if (themeWatcher.isSystemThemeSupported()) {
+            systemThemeSection = <div>
+                <LabelledToggleSwitch
+                    value={this.state.useSystemTheme}
+                    label={SettingsStore.getDisplayName("use_system_theme")}
+                    onChange={this._onUseSystemThemeChanged}
+                />
+            </div>;
+        }
+
+        let customThemeForm;
+        if (SettingsStore.isFeatureEnabled("feature_custom_themes")) {
+            let messageElement = null;
+            if (this.state.customThemeMessage.text) {
+                if (this.state.customThemeMessage.isError) {
+                    messageElement = <div className='text-error'>{this.state.customThemeMessage.text}</div>;
+                } else {
+                    messageElement = <div className='text-success'>{this.state.customThemeMessage.text}</div>;
+                }
+            }
+            customThemeForm = (
+                <div className='mx_SettingsTab_section'>
+                    <form onSubmit={this._onAddCustomTheme}>
+                        <Field
+                            label={_t("Custom theme URL")}
+                            type='text'
+                            id='mx_GeneralUserSettingsTab_customThemeInput'
+                            autoComplete="off"
+                            onChange={this._onCustomThemeChange}
+                            value={this.state.customThemeUrl}
+                        />
+                        <AccessibleButton
+                            onClick={this._onAddCustomTheme}
+                            type="submit" kind="primary_sm"
+                            disabled={!this.state.customThemeUrl.trim()}
+                        >{_t("Add theme")}</AccessibleButton>
+                        {messageElement}
+                    </form>
+                </div>
+            );
+        }
+
+        const themes = Object.entries(enumerateThemes())
+            .map(p => ({id: p[0], name: p[1]})); // convert pairs to objects for code readability
+        const builtInThemes = themes.filter(p => !p.id.startsWith("custom-"));
+        const customThemes = themes.filter(p => !builtInThemes.includes(p))
+            .sort((a, b) => a.name.localeCompare(b.name));
+        const orderedThemes = [...builtInThemes, ...customThemes];
+        return (
+            <div className="mx_SettingsTab_section mx_GeneralUserSettingsTab_themeSection">
+                <span className="mx_SettingsTab_subheading">{_t("Theme")}</span>
+                {systemThemeSection}
+                <Field id="theme" label={_t("Theme")} element="select"
+                       value={this.state.theme} onChange={this._onThemeChange}
+                       disabled={this.state.useSystemTheme}
+                >
+                    {orderedThemes.map(theme => {
+                        return <option key={theme.id} value={theme.id}>{theme.name}</option>;
+                    })}
+                </Field>
+                {customThemeForm}
+                <SettingsFlag name="useCompactLayout" level={SettingLevel.ACCOUNT} />
+           </div>
+        );
+    }
+
+    _renderFontSection() {
+        return <div className="mx_SettingsTab_section">
+            <span className="mx_SettingsTab_subheading">{_t("Font size")}</span>
+            <Field
+                type="text"
+                label={_t("Font size")}
+                autoComplete="off"
+                placeholder={SettingsStore.getValue("font_size", null).toString()}
+                id="font_size_field"
+                onChange={(ev) => this._onFontSizeChanged(ev.target.value)}
+            />
+        </div>
+    }
+
+}
diff --git a/src/theme.js b/src/theme.js
index 442a89e25f..3309acdd01 100644
--- a/src/theme.js
+++ b/src/theme.js
@@ -81,7 +81,7 @@ export class ThemeWatcher {
     }
 
     getEffectiveTheme() {
-        // Dev note: Much of this logic is replicated in the GeneralUserSettingsTab
+        // Dev note: Much of this logic is replicated in the StyleUserSettingsTab
 
         // XXX: checking the isLight flag here makes checking it in the ThemeController
         // itself completely redundant since we just override the result here and we're