diff --git a/assets/fonts/Inter-Bold.woff2 b/assets/fonts/Inter-Bold.woff2
new file mode 100644
index 0000000..0f1b157
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diff --git a/assets/fonts/Inter-Light.woff2 b/assets/fonts/Inter-Light.woff2
new file mode 100644
index 0000000..dbe6143
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diff --git a/assets/fonts/Inter-Medium.woff2 b/assets/fonts/Inter-Medium.woff2
new file mode 100644
index 0000000..0fd2ee7
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diff --git a/assets/fonts/Inter-Regular.woff2 b/assets/fonts/Inter-Regular.woff2
new file mode 100644
index 0000000..b8699af
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diff --git a/assets/fonts/Inter-SemiBold.woff2 b/assets/fonts/Inter-SemiBold.woff2
new file mode 100644
index 0000000..95c48b1
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diff --git a/assets/fonts/JetBrainsMono-Bold.woff2 b/assets/fonts/JetBrainsMono-Bold.woff2
new file mode 100644
index 0000000..4917f43
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diff --git a/assets/fonts/JetBrainsMono-Medium.woff2 b/assets/fonts/JetBrainsMono-Medium.woff2
new file mode 100644
index 0000000..669d04c
Binary files /dev/null and b/assets/fonts/JetBrainsMono-Medium.woff2 differ
diff --git a/assets/fonts/JetBrainsMono-Regular.woff2 b/assets/fonts/JetBrainsMono-Regular.woff2
new file mode 100644
index 0000000..40da427
Binary files /dev/null and b/assets/fonts/JetBrainsMono-Regular.woff2 differ
diff --git a/assets/fonts/JetBrainsMono-SemiBold.woff2 b/assets/fonts/JetBrainsMono-SemiBold.woff2
new file mode 100644
index 0000000..5ead7b0
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diff --git a/src/fonts.css b/src/fonts.css
new file mode 100644
index 0000000..c312c87
--- /dev/null
+++ b/src/fonts.css
@@ -0,0 +1,75 @@
+/* Local Font Definitions for MarkdownConverter */
+
+/* Inter Font Family */
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 300;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Light.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 400;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Regular.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 500;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Medium.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 600;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-SemiBold.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 700;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Bold.woff2') format('woff2');
+}
+
+/* JetBrains Mono Font Family - For code, markdown editor, and ASCII art */
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 400;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-Regular.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 500;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-Medium.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 600;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-SemiBold.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 700;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-Bold.woff2') format('woff2');
+}
diff --git a/src/index.html b/src/index.html
index 2dd059c..5fc5299 100644
--- a/src/index.html
+++ b/src/index.html
@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>MarkdownConverter</title>
+    <link rel="stylesheet" href="fonts.css">
     <link rel="stylesheet" href="styles.css">
     <link rel="stylesheet" href="styles-modern.css">
     <link rel="stylesheet" href="styles-concreteinfo.css">