diff --git a/.vs/LibreTranslate.Net/DesignTimeBuild/.dtbcache.v2 b/.vs/LibreTranslate.Net/DesignTimeBuild/.dtbcache.v2
index a9bfabf..1480765 100644
Binary files a/.vs/LibreTranslate.Net/DesignTimeBuild/.dtbcache.v2 and b/.vs/LibreTranslate.Net/DesignTimeBuild/.dtbcache.v2 differ
diff --git a/LibreTranslate.Net.Cmd/Program.cs b/LibreTranslate.Net.Cmd/Program.cs
index 4214b4f..d49543d 100644
--- a/LibreTranslate.Net.Cmd/Program.cs
+++ b/LibreTranslate.Net.Cmd/Program.cs
@@ -7,16 +7,17 @@ class Program
         static void Main(string[] args)
         {
             var libreTranslate = new LibreTranslate();
-            var englishText = "Hello World!";
+            var englishText = "<p>Hello world!</p>";
             var getSupportedLanguagesAsyncTask = libreTranslate.GetSupportedLanguagesAsync();
             System.Threading.Tasks.Task.Run(() => getSupportedLanguagesAsyncTask).Wait();
             var supportedLanguages = getSupportedLanguagesAsyncTask.Result;
             Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(supportedLanguages, Newtonsoft.Json.Formatting.Indented));
             var TranslateAsyncTask = libreTranslate.TranslateAsync(new Translate()
             {
-                ApiKey = "MySecretApiKey",
+                ApiKey = "YourSecretKey",
                 Source = LanguageCode.English,
                 Target = LanguageCode.Spanish,
+                Format = Format.HTML, //Format is optional with 'Format.Text' as default value.
                 Text = englishText
             });
             System.Threading.Tasks.Task.Run(() => TranslateAsyncTask).Wait();
diff --git a/LibreTranslate.Net/Constants/Format.cs b/LibreTranslate.Net/Constants/Format.cs
new file mode 100644
index 0000000..f7e667c
--- /dev/null
+++ b/LibreTranslate.Net/Constants/Format.cs
@@ -0,0 +1,40 @@
+using Newtonsoft.Json.Serialization;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace LibreTranslate.Net
+{
+    public class Format
+    {
+        private static readonly Dictionary<string, Format> Instance = new Dictionary<string, Format>();
+        private readonly string Name;
+        private Format(string name)
+        {
+            Name = name;
+            Instance[Name] = this;
+        }
+        public static implicit operator Format(string str)
+        {
+            return $"{FromString(str)}";
+        }
+        public static Format FromString(string str)
+        {
+            if(Instance.TryGetValue(str, out Format format))
+            {
+                return format;
+            }
+            else
+            {
+                throw new ArgumentException($"{nameof(Net.Format)} must be 'text' or 'html'");
+            }
+        }
+        public override string ToString()
+        {
+            return $"{Name}";
+        }
+
+        public static readonly Format HTML = new Format("html");
+        public static readonly Format Text = new Format("text");
+    }
+}
diff --git a/LibreTranslate.Net/Constants/LanguageCode.cs b/LibreTranslate.Net/Constants/LanguageCode.cs
index d2a6fbd..5fade19 100644
--- a/LibreTranslate.Net/Constants/LanguageCode.cs
+++ b/LibreTranslate.Net/Constants/LanguageCode.cs
@@ -35,17 +35,34 @@ public override string ToString()
         }
         public static readonly LanguageCode English = new LanguageCode("en");
         public static readonly LanguageCode Arabic = new LanguageCode("ar");
+        public static readonly LanguageCode Azerbaijani = new LanguageCode("az");
+        public static readonly LanguageCode Catalan = new LanguageCode("ca");
         public static readonly LanguageCode Chinese = new LanguageCode("zh");
+        public static readonly LanguageCode Czech = new LanguageCode("cs");
+        public static readonly LanguageCode Danish = new LanguageCode("da");
+        public static readonly LanguageCode Dutch = new LanguageCode("nl");
+        public static readonly LanguageCode Esperanto = new LanguageCode("eo");
+        public static readonly LanguageCode Finnish = new LanguageCode("fi");
         public static readonly LanguageCode French = new LanguageCode("fr");
         public static readonly LanguageCode German = new LanguageCode("de");
+        public static readonly LanguageCode Greek = new LanguageCode("el");
+        public static readonly LanguageCode Hebrew = new LanguageCode("he");
         public static readonly LanguageCode Hindi = new LanguageCode("hi");
+        public static readonly LanguageCode Hungarian = new LanguageCode("hu");
+        public static readonly LanguageCode Indonesian = new LanguageCode("id");
         public static readonly LanguageCode Irish = new LanguageCode("ga");
         public static readonly LanguageCode Italian = new LanguageCode("it");
         public static readonly LanguageCode Japanese = new LanguageCode("ja");
         public static readonly LanguageCode Korean = new LanguageCode("ko");
+        public static readonly LanguageCode Persian = new LanguageCode("fa");
+        public static readonly LanguageCode Polish = new LanguageCode("pl");
         public static readonly LanguageCode Portuguese = new LanguageCode("pt");
         public static readonly LanguageCode Russian = new LanguageCode("ru");
+        public static readonly LanguageCode Slovak = new LanguageCode("sk");
         public static readonly LanguageCode Spanish = new LanguageCode("es");
+        public static readonly LanguageCode Swedish = new LanguageCode("sv");
+        public static readonly LanguageCode Turkish = new LanguageCode("tr");
+        public static readonly LanguageCode Ukranian = new LanguageCode("uk");
         public static readonly LanguageCode AutoDetect = new LanguageCode("auto");
     }
 }
diff --git a/LibreTranslate.Net/LibreTranslate.cs b/LibreTranslate.Net/LibreTranslate.cs
index 91fd108..6194c49 100644
--- a/LibreTranslate.Net/LibreTranslate.cs
+++ b/LibreTranslate.Net/LibreTranslate.cs
@@ -54,7 +54,8 @@ public async Task<string> TranslateAsync(Translate translate)
                 { "q", translate.Text },
                 { "source", translate.Source.ToString() },
                 { "target", translate.Target.ToString() },
-                { "api_key", translate.ApiKey }
+                { "format", translate.Format?.ToString() ?? Format.Text.ToString() },
+                { "api_key", translate.ApiKey },
             });
             var response = await HttpClient.SendAsync(new HttpRequestMessage(HttpMethod.Post, "/translate")
             {
diff --git a/LibreTranslate.Net/Models/Translate.cs b/LibreTranslate.Net/Models/Translate.cs
index ceaa4db..e344dce 100644
--- a/LibreTranslate.Net/Models/Translate.cs
+++ b/LibreTranslate.Net/Models/Translate.cs
@@ -22,6 +22,12 @@ public class Translate
         [JsonProperty("target")]
         public LanguageCode Target { get; set; }
         /// <summary>
+        /// [optional]
+        /// The current format of the text to be translated 
+        /// </summary>
+        [JsonProperty("format")]
+        public Format Format { get; set; }
+        /// <summary>
         /// The libre translate api key
         /// </summary>
         [JsonProperty("api_key")]
diff --git a/README.md b/README.md
index 21ed1ab..9d4e291 100644
--- a/README.md
+++ b/README.md
@@ -14,22 +14,38 @@ using LibreTranslate.Net;
 ```
 ### Usage
 ```csharp
-var LibreTranslate = new LibreTranslate();
-System.Collections.Generic.IEnumerable<SupportedLanguages> SupportedLanguages = await LibreTranslate.GetSupportedLanguagesAsync();
+var libreTranslate = new LibreTranslate();
+
+//Get supported languages
+System.Collections.Generic.IEnumerable<SupportedLanguages> SupportedLanguages = await libreTranslate.GetSupportedLanguagesAsync();
 System.Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(supportedLanguages, Newtonsoft.Json.Formatting.Indented));
+
+//text translation
 var englishText = "Hello World!";
-string spanishText = await LibreTranslate.TranslateAsync(new Translate() {
+string spanishText = await libreTranslate.TranslateAsync(new Translate() {
     ApiKey = "MySecretApiKey",
     Source = LanguageCode.English,
     Target = LanguageCode.Spanish,
     Text = englishText
 });
 System.Console.WriteLine(spanishText);
+
+//html translation
+var englishHtml = "<p>Hello World!</p>";
+string spanishHtml = await libreTranslate.TranslateAsync(new Translate() {
+    ApiKey = "MySecretApiKey",
+    Source = LanguageCode.English,
+    Target = LanguageCode.Spanish,
+    Format = Format.HTML,
+    Text = englishHtml
+});
+System.Console.WriteLine(spanishHtml);
 ```
 ### Output:
 ```
 Hello World!
 ¡Hola Mundo!
+<p>¡Hola Mundo!</p>
 ```
 ### Custom LibreTranslate URL (style: `http[s]://url` with no trailing `/`):
 ```csharp
@@ -45,15 +61,32 @@ Language|Code
 -|-
 English|`LanguageCode.English`
 Arabic|`LanguageCode.Arabic`
+Azerbaijani|`LanguageCode.Azerbaijani`
+Catalan|`LanguageCode.Catalan`
 Chinese|`LanguageCode.Chinese`
+Czech|`LanguageCode.Czech`
+Danish|`LanguageCode.Danish`
+Dutch|`LanguageCode.Dutch`
+Esperanto|`LanguageCode.Esperanto`
+Finnish|`LanguageCode.Finnish`
 French|`LanguageCode.French`
 German|`LanguageCode.German`
+Greek|`LanguageCode.Greek`
+Hebrew|`LanguageCode.Hebrew`
 Hindi|`LanguageCode.Hindi`
+Hungarian|`LanguageCode.Hungarian`
+Indonesian|`LanguageCode.Indonesian`
 Irish|`LanguageCode.Irish`
 Italian|`LanguageCode.Italian`
 Japanese|`LanguageCode.Japanese`
 Korean|`LanguageCode.Korean`
+Persian|`LanguageCode.Persian`
+Polish|`LanguageCode.Polish`
 Portuguese|`LanguageCode.Portuguese`
 Russian|`LanguageCode.Russian`
+Slovak|`LanguageCode.Slovak`
 Spanish|`LanguageCode.Spanish`
+Swedish|`LanguageCode.Swedish`
+Turkish|`LanguageCode.Turkish`
+Ukranian|`LanguageCode.Ukranian`
 AutoDetect|`LanguageCode.AutoDetect //This feature is experimental`