diff --git a/ui/widgets/input_fields.cpp b/ui/widgets/input_fields.cpp
index f2dafbe..c265910 100644
--- a/ui/widgets/input_fields.cpp
+++ b/ui/widgets/input_fields.cpp
@@ -27,6 +27,7 @@
 #include <QtGui/QTextDocumentFragment>
 #include <QtCore/QMimeData>
 #include <QtCore/QRegularExpression>
+#include <QtCore/QMap>
 
 namespace Ui {
 namespace {
@@ -58,6 +59,8 @@ const auto kNewlineChars = QString("\r\n")
 	+ QChar(QChar::ParagraphSeparator)
 	+ QChar(QChar::LineSeparator);
 
+QMap<QString, QString> customReplacesMap;
+
 // We need unique tags otherwise same custom emoji would join in a single
 // QTextCharFormat with the same properties, including kCustomEmojiText.
 auto GlobalCustomEmojiCounter = 0;
@@ -932,6 +935,10 @@ struct FormattingAction {
 
 } // namespace
 
+void AddCustomReplacement(QString from, QString to) {
+	customReplacesMap.insert(from, to);
+}
+
 // kTagUnderline is not used for Markdown.
 
 const QString InputField::kTagBold = QStringLiteral("**");
@@ -1052,6 +1059,9 @@ const InstantReplaces &InstantReplaces::Default() {
 			Assert(emoji != nullptr);
 			result.add(what, emoji->text());
 		}
+		for (auto i = customReplacesMap.constBegin(), e = customReplacesMap.constEnd(); i != e; ++i) {
+			result.add(i.key(), i.value());
+		}
 		return result;
 	}();
 	return result;
@@ -1066,6 +1076,20 @@ const InstantReplaces &InstantReplaces::TextOnly() {
 		result.add(
 			":shrug:",
 			QChar(175) + QString("\\_(") + QChar(12484) + ")_/" + QChar(175));
+		for (auto i = customReplacesMap.constBegin(), e = customReplacesMap.constEnd(); i != e; ++i) {
+			result.add(i.key(), i.value());
+		}
+		return result;
+	}();
+	return result;
+}
+
+const InstantReplaces &InstantReplaces::Custom() {
+	static const auto result = [] {
+		auto result = InstantReplaces();
+		for (auto i = customReplacesMap.constBegin(), e = customReplacesMap.constEnd(); i != e; ++i) {
+			result.add(i.key(), i.value());
+		}
 		return result;
 	}();
 	return result;
@@ -1652,6 +1676,14 @@ void InputField::setInstantReplaces(const InstantReplaces &replaces) {
 	_mutableInstantReplaces = replaces;
 }
 
+void InputField::setInstantReplaces(rpl::producer<InstantReplaces> producer) {
+	std::move(
+		producer
+	) | rpl::start_with_next([=](InstantReplaces replaces) {
+		_mutableInstantReplaces = replaces;
+	}, lifetime());
+}
+
 void InputField::setInstantReplacesEnabled(rpl::producer<bool> enabled) {
 	std::move(
 		enabled
diff --git a/ui/widgets/input_fields.h b/ui/widgets/input_fields.h
index 1da7845..286b8a1 100644
--- a/ui/widgets/input_fields.h
+++ b/ui/widgets/input_fields.h
@@ -29,6 +29,8 @@ class CustomEmoji;
 
 namespace Ui {
 
+void AddCustomReplacement(QString from, QString to);
+
 const auto kClearFormatSequence = QKeySequence("ctrl+shift+n");
 const auto kStrikeOutSequence = QKeySequence("ctrl+shift+x");
 const auto kMonospaceSequence = QKeySequence("ctrl+shift+m");
@@ -57,6 +59,7 @@ struct InstantReplaces {
 
 	static const InstantReplaces &Default();
 	static const InstantReplaces &TextOnly();
+	static const InstantReplaces &Custom();
 
 	int maxLength = 0;
 	Node reverseMap;
@@ -299,6 +302,7 @@ public:
 	void setAdditionalMargin(int margin);
 
 	void setInstantReplaces(const InstantReplaces &replaces);
+	void setInstantReplaces(rpl::producer<InstantReplaces> producer);
 	void setInstantReplacesEnabled(rpl::producer<bool> enabled);
 	void setMarkdownReplacesEnabled(rpl::producer<bool> enabled);
 	void setExtendedContextMenu(rpl::producer<ExtendedContextMenu> value);