diff --git a/libse/SsaStyle.cs b/libse/SsaStyle.cs
index 9217686e5..a1d386917 100644
--- a/libse/SsaStyle.cs
+++ b/libse/SsaStyle.cs
@@ -1,6 +1,7 @@
 using Nikse.SubtitleEdit.Core.SubtitleFormats;
 using System;
 using System.Drawing;
+using System.Globalization;
 using System.Text;
 
 namespace Nikse.SubtitleEdit.Core
@@ -9,7 +10,7 @@ namespace Nikse.SubtitleEdit.Core
     {
         public string Name { get; set; }
         public string FontName { get; set; }
-        public int FontSize { get; set; }
+        public float FontSize { get; set; }
         public bool Italic { get; set; }
         public bool Bold { get; set; }
         public bool Underline { get; set; }
@@ -31,7 +32,7 @@ namespace Nikse.SubtitleEdit.Core
         public SsaStyle()
         {
             FontName = Configuration.Settings.SubtitleSettings.SsaFontName;
-            FontSize = (int)Configuration.Settings.SubtitleSettings.SsaFontSize;
+            FontSize = (float)Configuration.Settings.SubtitleSettings.SsaFontSize;
             Primary = Color.FromArgb(Configuration.Settings.SubtitleSettings.SsaFontColorArgb);
             Secondary = Color.Yellow;
             Outline = Color.Black;
@@ -99,7 +100,7 @@ namespace Nikse.SubtitleEdit.Core
                 }
                 else if (f == "fontsize")
                 {
-                    sb.Append(FontSize);
+                    sb.Append(FontSize.ToString(CultureInfo.InvariantCulture));
                 }
                 else if (f == "primarycolour")
                 {
@@ -206,7 +207,7 @@ namespace Nikse.SubtitleEdit.Core
                 }
                 else if (f == "fontsize")
                 {
-                    sb.Append(FontSize);
+                    sb.Append(FontSize.ToString(CultureInfo.InvariantCulture));
                 }
                 else if (f == "primarycolour")
                 {
diff --git a/libse/SubtitleFormats/AdvancedSubStationAlpha.cs b/libse/SubtitleFormats/AdvancedSubStationAlpha.cs
index 343f8131d..72adc1546 100644
--- a/libse/SubtitleFormats/AdvancedSubStationAlpha.cs
+++ b/libse/SubtitleFormats/AdvancedSubStationAlpha.cs
@@ -30,7 +30,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
 
                 var ssa = Configuration.Settings.SubtitleSettings;
                 return "Style: Default," + ssa.SsaFontName + "," +
-                       (int)ssa.SsaFontSize + "," +
+                       ssa.SsaFontSize.ToString(CultureInfo.InvariantCulture)  + "," +
                        GetSsaColorString(Color.FromArgb(ssa.SsaFontColorArgb)) + "," +
                        "&H0300FFFF,&H00000000,&H02000000," + boldStyle + ",0,0,0,100,100,0,0," + borderStyle + "," + ssa.SsaOutline.ToString(CultureInfo.InvariantCulture) + "," +
                        Configuration.Settings.SubtitleSettings.SsaShadow.ToString(CultureInfo.InvariantCulture) + ",2," + ssa.SsaMarginLeft + "," + ssa.SsaMarginRight + "," + ssa.SsaMarginTopBottom + ",1";
@@ -403,8 +403,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text"
                             fontSize = node.Attributes["tts:fontSize"].Value.Replace("px", string.Empty).Replace("em", string.Empty);
                         }
 
-                        int fSize;
-                        if (!int.TryParse(fontSize, out fSize))
+                        if (!float.TryParse(fontSize, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out var fSize))
                         {
                             fSize = 20;
                         }
@@ -551,7 +550,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text"
                             fontSize = node.Attributes["tts:fontSize"].Value.Replace("px", string.Empty).Replace("em", string.Empty);
                         }
 
-                        if (!int.TryParse(fontSize, out var fSize))
+                        if (!float.TryParse(fontSize, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out var fSize))
                         {
                             fSize = 20;
                         }
@@ -824,7 +823,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text"
                             string fontSize = text.Substring(start + 4, end - (start + 4));
                             string extraTags = string.Empty;
                             CheckAndAddSubTags(ref fontSize, ref extraTags, out var unknownTags, out italic);
-                            if (Utilities.IsInteger(fontSize))
+                            if (float.TryParse(fontSize, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out _))
                             {
                                 text = text.Remove(start, end - start + 1);
                                 if (italic)
@@ -1747,7 +1746,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text"
                                 }
                                 else if (i == fontsizeIndex)
                                 {
-                                    if (!int.TryParse(f, out _) || f.StartsWith('-'))
+                                    if (!float.TryParse(f, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture , out _) || f.StartsWith('-'))
                                     {
                                         sb.AppendLine("'Fontsize' incorrect: " + rawLine);
                                         sb.AppendLine();
@@ -2048,9 +2047,9 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text"
                             }
                             else if (i == fontsizeIndex)
                             {
-                                if (int.TryParse(f, out var number))
+                                if (float.TryParse(f, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out var fOut))
                                 {
-                                    style.FontSize = number;
+                                    style.FontSize = fOut;
                                 }
                             }
                             else if (i == primaryColourIndex)
diff --git a/src/Forms/Styles/SubStationAlphaStyles.Designer.cs b/src/Forms/Styles/SubStationAlphaStyles.Designer.cs
index 2c9220cc2..6b8abb2d9 100644
--- a/src/Forms/Styles/SubStationAlphaStyles.Designer.cs
+++ b/src/Forms/Styles/SubStationAlphaStyles.Designer.cs
@@ -765,6 +765,7 @@
             // 
             // numericUpDownFontSize
             // 
+            this.numericUpDownFontSize.DecimalPlaces = 1;
             this.numericUpDownFontSize.Location = new System.Drawing.Point(100, 44);
             this.numericUpDownFontSize.Maximum = new decimal(new int[] {
             200,
diff --git a/src/Forms/Styles/SubStationAlphaStyles.cs b/src/Forms/Styles/SubStationAlphaStyles.cs
index 3b9d502f1..c8a7725c0 100644
--- a/src/Forms/Styles/SubStationAlphaStyles.cs
+++ b/src/Forms/Styles/SubStationAlphaStyles.cs
@@ -324,7 +324,7 @@ namespace Nikse.SubtitleEdit.Forms.Styles
             var subItem = new ListViewItem.ListViewSubItem(item, ssaStyle.FontName);
             item.SubItems.Add(subItem);
 
-            subItem = new ListViewItem.ListViewSubItem(item, ssaStyle.FontSize.ToString());
+            subItem = new ListViewItem.ListViewSubItem(item, ssaStyle.FontSize.ToString(CultureInfo.InvariantCulture));
             item.SubItems.Add(subItem);
 
             int count = 0;
@@ -548,9 +548,9 @@ namespace Nikse.SubtitleEdit.Forms.Styles
             checkBoxFontBold.Checked = style.Bold;
             checkBoxFontUnderline.Checked = style.Underline;
 
-            if (style.FontSize > 0 && style.FontSize <= numericUpDownFontSize.Maximum)
+            if (style.FontSize > 0 && style.FontSize <= (float)numericUpDownFontSize.Maximum)
             {
-                numericUpDownFontSize.Value = style.FontSize;
+                numericUpDownFontSize.Value = (decimal)style.FontSize;
             }
             else
             {
diff --git a/src/Forms/Styles/SubStationAlphaStylesBatchConvert.Designer.cs b/src/Forms/Styles/SubStationAlphaStylesBatchConvert.Designer.cs
index bc05bd238..47328b723 100644
--- a/src/Forms/Styles/SubStationAlphaStylesBatchConvert.Designer.cs
+++ b/src/Forms/Styles/SubStationAlphaStylesBatchConvert.Designer.cs
@@ -677,6 +677,7 @@
             // 
             // numericUpDownFontSize
             // 
+            this.numericUpDownFontSize.DecimalPlaces = 1;
             this.numericUpDownFontSize.Location = new System.Drawing.Point(100, 44);
             this.numericUpDownFontSize.Maximum = new decimal(new int[] {
             200,
diff --git a/src/Forms/Styles/SubStationAlphaStylesBatchConvert.cs b/src/Forms/Styles/SubStationAlphaStylesBatchConvert.cs
index 16b892932..edd43ac1e 100644
--- a/src/Forms/Styles/SubStationAlphaStylesBatchConvert.cs
+++ b/src/Forms/Styles/SubStationAlphaStylesBatchConvert.cs
@@ -886,9 +886,9 @@ namespace Nikse.SubtitleEdit.Forms.Styles
             checkBoxFontBold.Checked = style.Bold;
             checkBoxFontUnderline.Checked = style.Underline;
 
-            if (style.FontSize > 0 && style.FontSize <= numericUpDownFontSize.Maximum)
+            if (style.FontSize > 0 && style.FontSize <= (float) numericUpDownFontSize.Maximum)
             {
-                numericUpDownFontSize.Value = style.FontSize;
+                numericUpDownFontSize.Value = (decimal) style.FontSize;
             }
             else
             {