diff --git a/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs b/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs
new file mode 100644
index 00000000..b55d57b7
--- /dev/null
+++ b/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs
@@ -0,0 +1,56 @@
+using Microsoft.AspNetCore.Mvc.Localization;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System;
+using System.Collections.Generic;
+
+namespace Lombiq.HelpfulLibraries.AspNetCore.Localization;
+
+public class LocalizedHtmlStringConverter : JsonConverter<LocalizedHtmlString>
+{
+    public override void WriteJson(JsonWriter writer, LocalizedHtmlString value, JsonSerializer serializer)
+    {
+        writer.WriteStartObject();
+
+        writer.WritePropertyName(nameof(LocalizedHtmlString.Name));
+        writer.WriteValue(value.Name);
+
+        writer.WritePropertyName(nameof(LocalizedHtmlString.Value));
+        writer.WriteValue(value.Html());
+
+        writer.WritePropertyName(nameof(LocalizedHtmlString.IsResourceNotFound));
+        writer.WriteValue(value.IsResourceNotFound);
+
+        writer.WriteEndObject();
+    }
+
+    public override LocalizedHtmlString ReadJson(
+        JsonReader reader,
+        Type objectType,
+        LocalizedHtmlString existingValue,
+        bool hasExistingValue,
+        JsonSerializer serializer)
+    {
+        var token = JToken.Load(reader);
+
+        if (token.Type == JTokenType.String)
+        {
+            var text = token.Value<string>();
+            return new LocalizedHtmlString(text, text);
+        }
+
+        if (token is JObject jObject)
+        {
+            var name = jObject.GetMaybe(nameof(LocalizedHtmlString.Name))?.ToObject<string>();
+            var value = jObject.GetMaybe(nameof(LocalizedHtmlString.Value))?.ToObject<string>() ?? name;
+            var isResourceNotFound = jObject.GetMaybe(nameof(LocalizedHtmlString.IsResourceNotFound))?.ToObject<bool>();
+
+            name ??= value;
+            if (string.IsNullOrEmpty(name)) throw new InvalidOperationException("Missing name.");
+
+            return new LocalizedHtmlString(name, value, isResourceNotFound == true);
+        }
+
+        throw new InvalidOperationException($"Can't parse token \"{token}\". It should be object or string");
+    }
+}