diff --git a/src/core/htmltemplatehelper.cpp b/src/core/htmltemplatehelper.cpp
index e73f919a..47744b5c 100644
--- a/src/core/htmltemplatehelper.cpp
+++ b/src/core/htmltemplatehelper.cpp
@@ -21,6 +21,9 @@ QString WebGlobalOptions::toJavascriptObject() const
            + QString("webGraphviz: %1,\n").arg(Utils::boolToString(m_webGraphviz))
            + QString("constrainImageWidthEnabled: %1,\n").arg(Utils::boolToString(m_constrainImageWidthEnabled))
            + QString("protectFromXss: %1,\n").arg(Utils::boolToString(m_protectFromXss))
+           + QString("htmlTagEnabled: %1,\n").arg(Utils::boolToString(m_htmlTagEnabled))
+           + QString("autoBreakEnabled: %1,\n").arg(Utils::boolToString(m_autoBreakEnabled))
+           + QString("linkifyEnabled: %1,\n").arg(Utils::boolToString(m_linkifyEnabled))
            + QString("sectionNumberEnabled: %1\n").arg(Utils::boolToString(m_sectionNumberEnabled))
            + QStringLiteral("}");
 }
@@ -155,6 +158,9 @@ void HtmlTemplateHelper::updateMarkdownViewerTemplate(const MarkdownEditorConfig
         opts.m_sectionNumberEnabled = p_config.getSectionNumberEnabled();
         opts.m_constrainImageWidthEnabled = p_config.getConstrainImageWidthEnabled();
         opts.m_protectFromXss = p_config.getProtectFromXss();
+        opts.m_htmlTagEnabled = p_config.getHtmlTagEnabled();
+        opts.m_autoBreakEnabled = p_config.getAutoBreakEnabled();
+        opts.m_linkifyEnabled = p_config.getLinkifyEnabled();
         fillGlobalOptions(s_markdownViewerTemplate.m_template, opts);
     }
 
diff --git a/src/core/htmltemplatehelper.h b/src/core/htmltemplatehelper.h
index f1fc7db0..ded17b4d 100644
--- a/src/core/htmltemplatehelper.h
+++ b/src/core/htmltemplatehelper.h
@@ -20,6 +20,12 @@ namespace vnotex
 
         bool m_protectFromXss = false;
 
+        bool m_htmlTagEnabled = true;
+
+        bool m_autoBreakEnabled = false;
+
+        bool m_linkifyEnabled = true;
+
         QString toJavascriptObject() const;
     };
 
diff --git a/src/core/markdowneditorconfig.cpp b/src/core/markdowneditorconfig.cpp
index 0081b559..fb0590e5 100644
--- a/src/core/markdowneditorconfig.cpp
+++ b/src/core/markdowneditorconfig.cpp
@@ -39,6 +39,9 @@ void MarkdownEditorConfig::init(const QJsonObject &p_app, const QJsonObject &p_u
     m_zoomFactorInReadMode = READREAL(QStringLiteral("zoom_factor_in_read_mode"));
     m_fetchImagesInParseAndPaste = READBOOL(QStringLiteral("fetch_images_in_parse_and_paste"));
     m_protectFromXss = READBOOL(QStringLiteral("protect_from_xss"));
+    m_htmlTagEnabled = READBOOL(QStringLiteral("html_tag"));
+    m_autoBreakEnabled = READBOOL(QStringLiteral("auto_break"));
+    m_linkifyEnabled = READBOOL(QStringLiteral("linkify"));
 }
 
 QJsonObject MarkdownEditorConfig::toJson() const
@@ -56,6 +59,9 @@ QJsonObject MarkdownEditorConfig::toJson() const
     obj[QStringLiteral("zoom_factor_in_read_mode")] = m_zoomFactorInReadMode;
     obj[QStringLiteral("fetch_images_in_parse_and_paste")] = m_fetchImagesInParseAndPaste;
     obj[QStringLiteral("protect_from_xss")] = m_protectFromXss;
+    obj[QStringLiteral("html_tag")] = m_htmlTagEnabled;
+    obj[QStringLiteral("auto_break")] = m_autoBreakEnabled;
+    obj[QStringLiteral("linkify")] = m_linkifyEnabled;
     return obj;
 }
 
@@ -195,3 +201,33 @@ bool MarkdownEditorConfig::getProtectFromXss() const
 {
     return m_protectFromXss;
 }
+
+bool MarkdownEditorConfig::getHtmlTagEnabled() const
+{
+    return m_htmlTagEnabled;
+}
+
+void MarkdownEditorConfig::setHtmlTagEnabled(bool p_enabled)
+{
+    updateConfig(m_htmlTagEnabled, p_enabled, this);
+}
+
+bool MarkdownEditorConfig::getAutoBreakEnabled() const
+{
+    return m_autoBreakEnabled;
+}
+
+void MarkdownEditorConfig::setAutoBreakEnabled(bool p_enabled)
+{
+    updateConfig(m_autoBreakEnabled, p_enabled, this);
+}
+
+bool MarkdownEditorConfig::getLinkifyEnabled() const
+{
+    return m_linkifyEnabled;
+}
+
+void MarkdownEditorConfig::setLinkifyEnabled(bool p_enabled)
+{
+    updateConfig(m_linkifyEnabled, p_enabled, this);
+}
diff --git a/src/core/markdowneditorconfig.h b/src/core/markdowneditorconfig.h
index c2ae0a91..4a4c40ab 100644
--- a/src/core/markdowneditorconfig.h
+++ b/src/core/markdowneditorconfig.h
@@ -62,6 +62,15 @@ namespace vnotex
 
         bool getProtectFromXss() const;
 
+        bool getHtmlTagEnabled() const;
+        void setHtmlTagEnabled(bool p_enabled);
+
+        bool getAutoBreakEnabled() const;
+        void setAutoBreakEnabled(bool p_enabled);
+
+        bool getLinkifyEnabled() const;
+        void setLinkifyEnabled(bool p_enabled);
+
     private:
         QSharedPointer<TextEditorConfig> m_textEditorConfig;
 
@@ -97,6 +106,15 @@ namespace vnotex
 
         // Whether protect from Cross-Site Scripting.
         bool m_protectFromXss = false;
+
+        // Whether allow HTML tag in Markdown source.
+        bool m_htmlTagEnabled = true;
+
+        // Whether auto break a line with `\n`.
+        bool m_autoBreakEnabled = false;
+
+        // Whether convert URL-like text to links.
+        bool m_linkifyEnabled = true;
     };
 }
 
diff --git a/src/data/core/vnotex.json b/src/data/core/vnotex.json
index 500b3b7e..7ff2dcdd 100644
--- a/src/data/core/vnotex.json
+++ b/src/data/core/vnotex.json
@@ -237,7 +237,13 @@
             "//comment" : "Whether fetch images to local in Parse To Markdown And Paste",
             "fetch_images_in_parse_and_paste" : true,
             "//comment" : "Whether protect from Cross-Site Scripting attack",
-            "protect_from_xss" : false
+            "protect_from_xss" : false,
+            "//comment" : "Whether allow HTML tags in source",
+            "html_tag" : true,
+            "//comment" : "Whether auto break a line with '\\n'",
+            "auto_break" : false,
+            "//comment" : "Whether convert URL-like text to links",
+            "linkify" : true
         }
     },
     "widget" : {
diff --git a/src/data/extra/web/js/markdownit.js b/src/data/extra/web/js/markdownit.js
index 30d11f0a..3b07b546 100644
--- a/src/data/extra/web/js/markdownit.js
+++ b/src/data/extra/web/js/markdownit.js
@@ -94,6 +94,12 @@ class MarkdownIt extends VxWorker {
         this.name = 'markdownit';
 
         this.options = p_options;
+        if (!this.options) {
+            this.options = new MarkdownItOptions();
+            this.options.enableHtmlTag = window.vxOptions.htmlTagEnabled;
+            this.options.enableAutoBreaks = window.vxOptions.autoBreakEnabled;
+            this.options.enableLinkify = window.vxOptions.linkifyEnabled;
+        }
 
         // Languages of code blocks that need to skip highlight.
         this.langsToSkipHighlight = new Set();
@@ -332,4 +338,4 @@ class MarkdownIt extends VxWorker {
     }
 }
 
-window.vnotex.registerWorker(new MarkdownIt(new MarkdownItOptions()));
+window.vnotex.registerWorker(new MarkdownIt(null));
diff --git a/src/widgets/dialogs/settings/markdowneditorpage.cpp b/src/widgets/dialogs/settings/markdowneditorpage.cpp
index 85a15d8e..4363751e 100644
--- a/src/widgets/dialogs/settings/markdowneditorpage.cpp
+++ b/src/widgets/dialogs/settings/markdowneditorpage.cpp
@@ -1,7 +1,9 @@
 #include "markdowneditorpage.h"
 
 #include <QFormLayout>
+#include <QVBoxLayout>
 #include <QCheckBox>
+#include <QGroupBox>
 
 #include <widgets/widgetsfactory.h>
 #include <core/editorconfig.h>
@@ -20,57 +22,13 @@ MarkdownEditorPage::MarkdownEditorPage(QWidget *p_parent)
 
 void MarkdownEditorPage::setupUI()
 {
-    auto mainLayout = new QFormLayout(this);
+    auto mainLayout = new QVBoxLayout(this);
 
-    {
-        const QString label(tr("Insert file name as title"));
-        m_insertFileNameAsTitleCheckBox = WidgetsFactory::createCheckBox(label, this);
-        m_insertFileNameAsTitleCheckBox->setToolTip(tr("Insert file name as title when creating note"));
-        mainLayout->addRow(m_insertFileNameAsTitleCheckBox);
-        addSearchItem(label, m_insertFileNameAsTitleCheckBox->toolTip(), m_insertFileNameAsTitleCheckBox);
-        connect(m_insertFileNameAsTitleCheckBox, &QCheckBox::stateChanged,
-                this, &MarkdownEditorPage::pageIsChanged);
-    }
+    auto readBox = setupReadGroup();
+    mainLayout->addWidget(readBox);
 
-    {
-        const QString label(tr("Section number"));
-        m_sectionNumberCheckBox = WidgetsFactory::createCheckBox(label, this);
-        m_sectionNumberCheckBox->setToolTip(tr("Display section number of headings in read mode"));
-        mainLayout->addRow(m_sectionNumberCheckBox);
-        addSearchItem(label, m_sectionNumberCheckBox->toolTip(), m_sectionNumberCheckBox);
-        connect(m_sectionNumberCheckBox, &QCheckBox::stateChanged,
-                this, &MarkdownEditorPage::pageIsChanged);
-    }
-
-    {
-        const QString label(tr("Constrain image width"));
-        m_constrainImageWidthCheckBox = WidgetsFactory::createCheckBox(label, this);
-        m_constrainImageWidthCheckBox->setToolTip(tr("Constrain image width to the window"));
-        mainLayout->addRow(m_constrainImageWidthCheckBox);
-        addSearchItem(label, m_constrainImageWidthCheckBox->toolTip(), m_constrainImageWidthCheckBox);
-        connect(m_constrainImageWidthCheckBox, &QCheckBox::stateChanged,
-                this, &MarkdownEditorPage::pageIsChanged);
-    }
-
-    {
-        const QString label(tr("Constrain in-place preview width"));
-        m_constrainInPlacePreviewWidthCheckBox = WidgetsFactory::createCheckBox(label, this);
-        m_constrainInPlacePreviewWidthCheckBox->setToolTip(tr("Constrain in-place preview width to the window"));
-        mainLayout->addRow(m_constrainInPlacePreviewWidthCheckBox);
-        addSearchItem(label, m_constrainInPlacePreviewWidthCheckBox->toolTip(), m_constrainInPlacePreviewWidthCheckBox);
-        connect(m_constrainInPlacePreviewWidthCheckBox, &QCheckBox::stateChanged,
-                this, &MarkdownEditorPage::pageIsChanged);
-    }
-
-    {
-        const QString label(tr("Fetch images to local in Parse And Paste"));
-        m_fetchImagesToLocalCheckBox = WidgetsFactory::createCheckBox(label, this);
-        m_fetchImagesToLocalCheckBox->setToolTip(tr("Fetch images to local in Parse To Markdown And Paste"));
-        mainLayout->addRow(m_fetchImagesToLocalCheckBox);
-        addSearchItem(label, m_fetchImagesToLocalCheckBox->toolTip(), m_fetchImagesToLocalCheckBox);
-        connect(m_fetchImagesToLocalCheckBox, &QCheckBox::stateChanged,
-                this, &MarkdownEditorPage::pageIsChanged);
-    }
+    auto editBox = setupEditGroup();
+    mainLayout->addWidget(editBox);
 }
 
 void MarkdownEditorPage::loadInternal()
@@ -86,6 +44,12 @@ void MarkdownEditorPage::loadInternal()
     m_constrainInPlacePreviewWidthCheckBox->setChecked(markdownConfig.getConstrainInPlacePreviewWidthEnabled());
 
     m_fetchImagesToLocalCheckBox->setChecked(markdownConfig.getFetchImagesInParseAndPaste());
+
+    m_htmlTagCheckBox->setChecked(markdownConfig.getHtmlTagEnabled());
+
+    m_autoBreakCheckBox->setChecked(markdownConfig.getAutoBreakEnabled());
+
+    m_linkifyCheckBox->setChecked(markdownConfig.getLinkifyEnabled());
 }
 
 void MarkdownEditorPage::saveInternal()
@@ -102,6 +66,12 @@ void MarkdownEditorPage::saveInternal()
 
     markdownConfig.setFetchImagesInParseAndPaste(m_fetchImagesToLocalCheckBox->isChecked());
 
+    markdownConfig.setHtmlTagEnabled(m_htmlTagCheckBox->isChecked());
+
+    markdownConfig.setAutoBreakEnabled(m_autoBreakCheckBox->isChecked());
+
+    markdownConfig.setLinkifyEnabled(m_linkifyCheckBox->isChecked());
+
     EditorPage::notifyEditorConfigChange();
 }
 
@@ -109,3 +79,99 @@ QString MarkdownEditorPage::title() const
 {
     return tr("Markdown Editor");
 }
+
+QGroupBox *MarkdownEditorPage::setupReadGroup()
+{
+    auto box = new QGroupBox(tr("Read"), this);
+    auto layout = new QFormLayout(box);
+
+    {
+        const QString label(tr("Section number"));
+        m_sectionNumberCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_sectionNumberCheckBox->setToolTip(tr("Display section number of headings in read mode"));
+        layout->addRow(m_sectionNumberCheckBox);
+        addSearchItem(label, m_sectionNumberCheckBox->toolTip(), m_sectionNumberCheckBox);
+        connect(m_sectionNumberCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    {
+        const QString label(tr("Constrain image width"));
+        m_constrainImageWidthCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_constrainImageWidthCheckBox->setToolTip(tr("Constrain image width to the window"));
+        layout->addRow(m_constrainImageWidthCheckBox);
+        addSearchItem(label, m_constrainImageWidthCheckBox->toolTip(), m_constrainImageWidthCheckBox);
+        connect(m_constrainImageWidthCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    {
+        const QString label(tr("HTML tag"));
+        m_htmlTagCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_htmlTagCheckBox->setToolTip(tr("Allow HTML tags in source"));
+        layout->addRow(m_htmlTagCheckBox);
+        addSearchItem(label, m_htmlTagCheckBox->toolTip(), m_htmlTagCheckBox);
+        connect(m_htmlTagCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    {
+        const QString label(tr("Auto break"));
+        m_autoBreakCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_autoBreakCheckBox->setToolTip(tr("Automatically break a line with '\\n'"));
+        layout->addRow(m_autoBreakCheckBox);
+        addSearchItem(label, m_autoBreakCheckBox->toolTip(), m_autoBreakCheckBox);
+        connect(m_autoBreakCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    {
+        const QString label(tr("Linkify"));
+        m_linkifyCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_linkifyCheckBox->setToolTip(tr("Convert URL-like text to links"));
+        layout->addRow(m_linkifyCheckBox);
+        addSearchItem(label, m_linkifyCheckBox->toolTip(), m_linkifyCheckBox);
+        connect(m_linkifyCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    return box;
+}
+
+QGroupBox *MarkdownEditorPage::setupEditGroup()
+{
+    auto box = new QGroupBox(tr("Edit"), this);
+    auto layout = new QFormLayout(box);
+
+    {
+        const QString label(tr("Insert file name as title"));
+        m_insertFileNameAsTitleCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_insertFileNameAsTitleCheckBox->setToolTip(tr("Insert file name as title when creating note"));
+        layout->addRow(m_insertFileNameAsTitleCheckBox);
+        addSearchItem(label, m_insertFileNameAsTitleCheckBox->toolTip(), m_insertFileNameAsTitleCheckBox);
+        connect(m_insertFileNameAsTitleCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    {
+        const QString label(tr("Constrain in-place preview width"));
+        m_constrainInPlacePreviewWidthCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_constrainInPlacePreviewWidthCheckBox->setToolTip(tr("Constrain in-place preview width to the window"));
+        layout->addRow(m_constrainInPlacePreviewWidthCheckBox);
+        addSearchItem(label, m_constrainInPlacePreviewWidthCheckBox->toolTip(), m_constrainInPlacePreviewWidthCheckBox);
+        connect(m_constrainInPlacePreviewWidthCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    {
+        const QString label(tr("Fetch images to local in Parse And Paste"));
+        m_fetchImagesToLocalCheckBox = WidgetsFactory::createCheckBox(label, box);
+        m_fetchImagesToLocalCheckBox->setToolTip(tr("Fetch images to local in Parse To Markdown And Paste"));
+        layout->addRow(m_fetchImagesToLocalCheckBox);
+        addSearchItem(label, m_fetchImagesToLocalCheckBox->toolTip(), m_fetchImagesToLocalCheckBox);
+        connect(m_fetchImagesToLocalCheckBox, &QCheckBox::stateChanged,
+                this, &MarkdownEditorPage::pageIsChanged);
+    }
+
+    return box;
+}
diff --git a/src/widgets/dialogs/settings/markdowneditorpage.h b/src/widgets/dialogs/settings/markdowneditorpage.h
index a2e797d0..57880257 100644
--- a/src/widgets/dialogs/settings/markdowneditorpage.h
+++ b/src/widgets/dialogs/settings/markdowneditorpage.h
@@ -4,6 +4,7 @@
 #include "settingspage.h"
 
 class QCheckBox;
+class QGroupBox;
 
 namespace vnotex
 {
@@ -23,6 +24,10 @@ namespace vnotex
     private:
         void setupUI();
 
+        QGroupBox *setupReadGroup();
+
+        QGroupBox *setupEditGroup();
+
         QCheckBox *m_insertFileNameAsTitleCheckBox = nullptr;
 
         QCheckBox *m_sectionNumberCheckBox = nullptr;
@@ -32,6 +37,12 @@ namespace vnotex
         QCheckBox *m_constrainInPlacePreviewWidthCheckBox = nullptr;
 
         QCheckBox *m_fetchImagesToLocalCheckBox = nullptr;
+
+        QCheckBox *m_htmlTagCheckBox = nullptr;
+
+        QCheckBox *m_autoBreakCheckBox = nullptr;
+
+        QCheckBox *m_linkifyCheckBox = nullptr;
     };
 }
 
diff --git a/src/widgets/dialogs/settings/settingsdialog.cpp b/src/widgets/dialogs/settings/settingsdialog.cpp
index 627436ec..6f9ac3f1 100644
--- a/src/widgets/dialogs/settings/settingsdialog.cpp
+++ b/src/widgets/dialogs/settings/settingsdialog.cpp
@@ -49,7 +49,7 @@ void SettingsDialog::setupPageExplorer(QBoxLayout *p_layout, QWidget *p_parent)
     auto layout = new QVBoxLayout();
 
     m_searchEdit = WidgetsFactory::createLineEdit(p_parent);
-    m_searchEdit->setPlaceholderText(tr("Type to search"));
+    m_searchEdit->setPlaceholderText(tr("Search"));
     layout->addWidget(m_searchEdit);
 
     m_pageExplorer = new TreeWidget(TreeWidget::None, p_parent);
diff --git a/src/widgets/findandreplacewidget.cpp b/src/widgets/findandreplacewidget.cpp
index 84a12bab..b27f1b3e 100644
--- a/src/widgets/findandreplacewidget.cpp
+++ b/src/widgets/findandreplacewidget.cpp
@@ -73,7 +73,7 @@ void FindAndReplaceWidget::setupUI()
         auto label = new QLabel(tr("Find:"), this);
 
         m_findLineEdit = WidgetsFactory::createLineEdit(this);
-        m_findLineEdit->setPlaceholderText(tr("Type to search"));
+        m_findLineEdit->setPlaceholderText(tr("Search"));
         connect(m_findLineEdit, &QLineEdit::textChanged,
                 m_findTextTimer, QOverload<>::of(&QTimer::start));