diff --git a/src/libse/Common/Utilities.cs b/src/libse/Common/Utilities.cs
index 08f3657d5..dff438f41 100644
--- a/src/libse/Common/Utilities.cs
+++ b/src/libse/Common/Utilities.cs
@@ -1301,13 +1301,37 @@ namespace Nikse.SubtitleEdit.Core.Common
         }
 
         /// <summary>
-        /// UrlEncodes a string without the requirement for System.Web
+        /// UrlEncodes a string without the requirement for System.Web.
+        /// Will crash if text length > 2000.
         /// </summary>
         public static string UrlEncode(string text)
         {
             return Uri.EscapeDataString(text);
         }
 
+        /// <summary>
+        /// Calculates the length if the text url encoded.
+        /// </summary>
+        public static int UrlEncodeLength(string text)
+        {
+            var urlEncodeLength = 0;
+            foreach (var ch in text)
+            {
+                if (ch >= 'a' && ch <= 'z' ||
+                    ch >= 'A' && ch <= 'Z' ||
+                    ch >= '0' && ch <= '9')
+                {
+                    urlEncodeLength++;
+                }
+                else
+                {
+                    urlEncodeLength += 3;
+                }
+            }
+
+            return urlEncodeLength;
+        }
+
         /// <summary>
         /// UrlDecodes a string without requiring System.Web
         /// </summary>
diff --git a/src/libse/Translate/Processor/TranslationProcessor.cs b/src/libse/Translate/Processor/TranslationProcessor.cs
index cae84f8f6..c86e1bc6b 100644
--- a/src/libse/Translate/Processor/TranslationProcessor.cs
+++ b/src/libse/Translate/Processor/TranslationProcessor.cs
@@ -47,7 +47,7 @@ namespace Nikse.SubtitleEdit.Core.Translate.Processor
         {
             public readonly List<TTranslationBaseUnit> TranslationUnits = new List<TTranslationBaseUnit>();
 
-            public int TextSize => TranslationUnits.ConvertAll(e => Utilities.UrlEncode(e.Text).Length).Sum();
+            public int TextSize => TranslationUnits.ConvertAll(e => Utilities.UrlEncodeLength(e.Text)).Sum();
 
             public int ArrayLength => TranslationUnits.Count;
         }
@@ -103,7 +103,7 @@ namespace Nikse.SubtitleEdit.Core.Translate.Processor
 
             foreach (var translationUnit in translationUnits)
             {
-                if (currentChunk.TextSize + Utilities.UrlEncode(translationUnit.Text).Length > maxTextSize
+                if (currentChunk.TextSize + Utilities.UrlEncodeLength(translationUnit.Text) > maxTextSize
                     || currentChunk.ArrayLength + 1 > maximumRequestArrayLength)
                 {
                     yield return currentChunk;