diff --git a/imprimir_etiquetas_termica.php b/imprimir_etiquetas_termica.php
index f9c4191e..e477d550 100644
--- a/imprimir_etiquetas_termica.php
+++ b/imprimir_etiquetas_termica.php
@@ -16,7 +16,7 @@ if (empty($codes)) {
     <title>Imprimir Etiquetas Térmicas</title>
     <style>
         body {
-            font-family: Verdana, sans-serif;
+            font-family: Arial, sans-serif;
             margin: 0;
             padding: 0;
             display: flex;
@@ -41,19 +41,21 @@ if (empty($codes)) {
             background: #0056b3;
         }
 
-        /* Hoja: 96mm x 75mm (Horizontal) */
+        /* Hoja: 96mm x 75mm */
         .etiquetas-container {
             width: 96mm;
             height: 75mm;
             display: grid;
             grid-template-columns: repeat(3, 28mm);
             grid-template-rows: repeat(3, 21mm);
-            gap: 2mm;
-            justify-content: center;
-            align-content: center;
+            column-gap: 4mm;
+            row-gap: 3mm;
+            padding-left: 2.5mm;
+            padding-top: 6.5mm; /* Aumentado de 5mm a 6.5mm */
             background: white;
             box-sizing: border-box;
             page-break-after: always;
+            overflow: hidden;
         }
 
         .etiqueta {
@@ -62,41 +64,47 @@ if (empty($codes)) {
             box-sizing: border-box;
             display: flex;
             flex-direction: column;
-            justify-content: flex-start; /* Cambiado de center a flex-start para controlar el inicio */
+            justify-content: center;
             align-items: center;
             overflow: hidden;
             text-align: center;
-            padding: 6mm 1mm 1mm 1mm; /* Regresado a 6mm para que no se corte el texto AFS y suba la posición */
-            border: 0.1mm solid #eee; /* Guía visual en pantalla */
+            padding: 0;
+            border: none;
         }
 
         .barcode-container {
-            height: 11mm; 
+            height: 11.5mm; 
             display: flex;
             justify-content: center;
             align-items: center;
-            margin: 0; /* Eliminado margen para control total con el padding de la etiqueta */
-            padding: 0 1mm;
+            margin-top: 1.5mm; /* Añadido margen superior para bajarlo un poco */
+            padding: 0;
             box-sizing: border-box;
             width: 100%;
         }
 
         .barcode-container svg {
-            height: 11mm; 
+            height: 11.5mm; 
             width: auto;
             display: block;
             margin: 0 auto;
+            /* Desactivar suavizado para máxima nitidez */
+            shape-rendering: crispEdges;
         }
 
         .sku-text {
-            font-size: 7px;
-            margin-top: 1mm; /* Reducido ligeramente */
-            letter-spacing: 0.5px;
+            font-family: Arial, sans-serif;
+            font-size: 3.5mm;
+            font-weight: normal;
+            margin-top: 0.5mm;
+            width: 100%;
+            line-height: 1;
+            color: black;
         }
 
         @media print {
             @page {
-                size: 96mm 75mm landscape;
+                size: 96mm 75mm;
                 margin: 0;
             }
             body {
@@ -112,9 +120,6 @@ if (empty($codes)) {
                 box-shadow: none;
                 margin: 0;
             }
-            .etiqueta {
-                border: none;
-            }
         }
     </style>
 </head>
@@ -137,8 +142,8 @@ if (empty($codes)) {
                 <div class="etiqueta">
                     <div class="barcode-container">
                         <?php 
-                        // Usando Code 128 Estándar Universal (Factor 1.0, sin reducción)
-                        echo $generator->getBarcode($code, 1.0, 100, 'black', 0); 
+                        // Narrow bar: 0.25mm (2 dots), Height: 11.5mm, Quiet Zone: 4mm
+                        echo $generator->getBarcode($code, 0.25, 11.5, 'black', 4); 
                         ?>
                     </div>
                     <div class="sku-text"><?php echo htmlspecialchars($code); ?></div>
diff --git a/includes/barcode_generator.php b/includes/barcode_generator.php
index bedd3119..6a90abea 100644
--- a/includes/barcode_generator.php
+++ b/includes/barcode_generator.php
@@ -1,5 +1,5 @@
 <?php
-// Simplified Barcode Generator for Code 128
+// Simplified Barcode Generator for Code 128 and Code 39
 // Generates SVG output.
 
 class BarcodeGenerator
@@ -11,29 +11,27 @@ class BarcodeGenerator
         $this->barcode_codes = $this->getCode128Map();
     }
 
-    public function getBarcode($code, $widthFactor = 1, $height = 50, $foregroundColor = 'black', $barReduction = 0)
+    public function getBarcode($code, $narrowBarWidth = 0.25, $height = 11.5, $foregroundColor = 'black', $quietZoneMM = 4, $type = 'C128')
     {
-        $barcodeData = $this->getBarcodeData($code);
+        $barcodeData = ($type === 'C39') ? $this->getBarcodeData39($code) : $this->getBarcodeData($code);
         if (!$barcodeData) return '';
 
         $bars = '';
-        $quietZone = 10;
-        $x = $quietZone;
+        $x = $quietZoneMM;
 
         $barArray = str_split($barcodeData['bars']);
         for ($i = 0; $i < count($barArray); $i++) {
             $val = (int)$barArray[$i];
-            $width = $widthFactor * $val;
-            if ($i % 2 == 0) { // Even indices are bars, odd are spaces
-                // Apply bar reduction to increase white space between bars
-                $drawWidth = max(0.4, $width - $barReduction);
-                $bars .= '<rect x="' . $x . '" y="0" width="' . $drawWidth . '" height="' . $height . '" fill="' . $foregroundColor . '" />';
+            $width = $narrowBarWidth * $val;
+            if ($i % 2 == 0) { // Even indices are bars
+                $bars .= '<rect x="' . $x . '" y="0" width="' . $width . '" height="' . $height . '" fill="' . $foregroundColor . '" />';
             }
             $x += $width;
         }
 
-        $totalWidth = $x + $quietZone;
-        $svg = '<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="' . $totalWidth . '" height="' . $height . '" viewBox="0 0 ' . $totalWidth . ' ' . $height . '" shape-rendering="crispEdges">';
+        $totalWidth = $x + $quietZoneMM;
+        // Using crispEdges for maximum sharpness on thermal printers
+        $svg = '<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="' . $totalWidth . 'mm" height="' . $height . 'mm" viewBox="0 0 ' . $totalWidth . ' ' . $height . '" shape-rendering="crispEdges">';
         $svg .= '<rect width="' . $totalWidth . '" height="' . $height . '" fill="white" />';
         $svg .= $bars;
         $svg .= '</svg>';
@@ -43,10 +41,9 @@ class BarcodeGenerator
 
     private function getBarcodeData($code)
     {
-        // Remove any accidental spaces and trim
-        $code = str_replace(' ', '', trim($code));
+        $code = str_replace(' ', '', strtoupper(trim($code)));
         $len = strlen($code);
-        $indices = [104]; // Start B (Standard Set B)
+        $indices = [104]; // Start B
         
         for ($i = 0; $i < $len; $i++) {
             $char = $code[$i];
@@ -56,7 +53,6 @@ class BarcodeGenerator
             }
         }
 
-        // Checksum calculation
         $sum = $indices[0];
         for ($i = 1; $i < count($indices); $i++) {
             $sum += ($indices[$i] * $i);
@@ -75,6 +71,33 @@ class BarcodeGenerator
         return ['bars' => $bars];
     }
 
+    private function getBarcodeData39($code)
+    {
+        $code = '*' . strtoupper(trim($code)) . '*';
+        $map = [
+            '0' => '111221211', '1' => '211211112', '2' => '112211112', '3' => '212211111',
+            '4' => '111221112', '5' => '211221111', '6' => '112221111', '7' => '111211212',
+            '8' => '211211211', '9' => '112211211', 'A' => '211112112', 'B' => '112112112',
+            'C' => '212112111', 'D' => '111122112', 'E' => '211122111', 'F' => '112122111',
+            'G' => '111112212', 'H' => '211112211', 'I' => '112112211', 'J' => '111122211',
+            'K' => '211111122', 'L' => '112111122', 'M' => '212111121', 'N' => '111121122',
+            'O' => '211121121', 'P' => '112121121', 'Q' => '111111222', 'R' => '211111221',
+            'S' => '112111221', 'T' => '111121221', 'U' => '221111112', 'V' => '122111112',
+            'W' => '222111111', 'X' => '121121112', 'Y' => '221121111', 'Z' => '122121111',
+            '-' => '121111212', '.' => '221111211', ' ' => '122111211', '*' => '121121211',
+            '$' => '121212111', '/' => '121211121', '+' => '121112121', '%' => '111212121'
+        ];
+
+        $bars = '';
+        for ($i = 0; $i < strlen($code); $i++) {
+            $char = $code[$i];
+            if (isset($map[$char])) {
+                $bars .= $map[$char] . '1'; // Add a narrow space between characters
+            }
+        }
+        return ['bars' => rtrim($bars, '1')];
+    }
+
     private function getCharValue($set, $char)
     {
         if (isset($this->barcode_codes[$set][$char])) {
@@ -107,12 +130,12 @@ class BarcodeGenerator
                 '212123', '212321', '232121', '111323', '131123', '131321', '112313', '132113', '132311', '211313', // 30-39
                 '231113', '231311', '112133', '112331', '132131', '113123', '113321', '133121', '313121', '211331', // 40-49
                 '231131', '213113', '213311', '213131', '311123', '311321', '331121', '312113', '312311', '332111', // 50-59
-                '314111', '221411', '413111', '111224', '111421', '121124', '121421', '141122', '141221', '112214', // 60-69
-                '112412', '122114', '122411', '142112', '142211', '241211', '221114', '411122', '411221', '421121', // 70-79
-                '421211', '212141', '214121', '412121', '111143', '111341', '131141', '114113', '114311', '411113', // 80-89
-                '411311', '113141', '114131', '311141', '411131', '232131', '233131', '132131', '113131', '311131', // 90-99
-                '311311', '331131', '313111', '211412', '211214', '211232', '2331112' // 100-106
+                '314111', '221411', '431111', '111224', '111413', '121124', '121421', '141122', '141221', '112214', // 60-69
+                '112412', '122114', '122411', '142112', '142211', '241211', '221114', '413111', '241112', '134111', // 70-79
+                '111242', '121142', '121241', '114212', '124112', '124211', '411212', '421112', '421211', '212141', // 80-89
+                '214121', '412121', '111143', '111341', '131141', '114113', '114311', '411113', '411311', '113141', // 90-99
+                '114131', '311141', '411131', '211412', '211214', '211232', '2331112' // 100-106
             ]
         ];
     }
-}
+}
\ No newline at end of file
diff --git a/test_etiquetas.php b/test_etiquetas.php
index 704166f9..14163fc0 100644
--- a/test_etiquetas.php
+++ b/test_etiquetas.php
@@ -1,16 +1,20 @@
 <?php
-// test_etiquetas.php - Prueba de etiquetas con Opción 3 (Finas)
 require_once 'includes/barcode_generator.php';
 $generator = new BarcodeGenerator();
+
+// Simulación de datos para prueba
+$codes = ['AFS123456', 'PROD789012', 'TEST345678', 'ITEM901234', 'SKU567890', 'CODE112233', 'BAR445566', 'LBL778899', 'FIN001122'];
+$product_names = array_fill(0, 9, 'Producto de Prueba');
+
 ?>
 <!DOCTYPE html>
 <html lang="es">
 <head>
     <meta charset="UTF-8">
-    <title>Prueba Etiquetas - Opción 3 (Finas)</title>
+    <title>Prueba de Etiquetas - REDPOS 4B-2054K</title>
     <style>
         body {
-            font-family: Verdana, sans-serif;
+            font-family: Arial, sans-serif;
             margin: 0;
             padding: 0;
             display: flex;
@@ -31,66 +35,80 @@ $generator = new BarcodeGenerator();
             box-shadow: 0 2px 4px rgba(0,0,0,0.1);
         }
 
-        .no-print:hover {
-            background: #218838;
+        .info-box {
+            background: white;
+            padding: 15px;
+            margin: 10px;
+            border-radius: 8px;
+            border-left: 5px solid #28a745;
+            max-width: 600px;
+            font-size: 14px;
         }
 
-        /* Hoja: 96mm x 75mm (Horizontal) */
+        /* Hoja: 96mm x 75mm */
         .etiquetas-container {
             width: 96mm;
             height: 75mm;
             display: grid;
             grid-template-columns: repeat(3, 28mm);
             grid-template-rows: repeat(3, 21mm);
-            gap: 2mm;
-            justify-content: center;
-            align-content: center;
+            column-gap: 4mm;
+            row-gap: 3mm;
+            padding-left: 2.5mm;
+            padding-top: 6.5mm; /* Aumentado de 5mm a 6.5mm */
             background: white;
             box-sizing: border-box;
-            border: 1px dashed #ccc;
+            page-break-after: always;
+            overflow: hidden;
+            box-shadow: 0 0 10px rgba(0,0,0,0.1);
         }
 
         .etiqueta {
             width: 28mm;
             height: 21mm;
-            border: 0.1mm solid #eee;
             box-sizing: border-box;
             display: flex;
             flex-direction: column;
-            justify-content: flex-start;
+            justify-content: center;
             align-items: center;
             overflow: hidden;
             text-align: center;
-            padding: 6mm 1mm 1mm 1mm; /* Regresado a 6mm para que no se corte el texto AFS y suba la posición */
+            padding: 0;
+            border: 0.1mm dashed #ccc; /* Guía visual solo en pantalla */
         }
 
         .barcode-container {
-            height: 11mm; 
+            height: 11.5mm; 
             display: flex;
             justify-content: center;
             align-items: center;
-            margin: 0;
-            padding: 0 1mm;
+            margin-top: 1.5mm; /* Añadido margen superior para bajarlo un poco */
+            padding: 0;
             box-sizing: border-box;
             width: 100%;
         }
 
         .barcode-container svg {
-            height: 11mm; 
+            height: 11.5mm; 
             width: auto;
             display: block;
             margin: 0 auto;
+            shape-rendering: crispEdges;
         }
 
         .sku-text {
-            font-size: 7px;
-            margin-top: 1mm;
-            letter-spacing: 0.5px;
+            font-family: Arial, sans-serif;
+            font-size: 3.5mm;
+            font-weight: normal;
+            margin-top: 0.5mm;
+            width: 100%;
+            line-height: 1;
+            color: black;
         }
 
         @media print {
             @page {
-                size: 96mm 75mm landscape;
+                size: 96mm 75mm;
                 margin: 0;
             }
             body {
@@ -98,7 +116,7 @@ $generator = new BarcodeGenerator();
                 margin: 0;
                 padding: 0;
             }
-            .no-print {
+            .no-print, .info-box {
                 display: none;
             }
             .etiquetas-container {
@@ -114,30 +132,27 @@ $generator = new BarcodeGenerator();
 </head>
 <body>
 
-    <button class="no-print" onclick="window.print()">IMPRIMIR PRUEBA (Opción 3)</button>
-
-    <div class="etiquetas-container">
-        <?php 
-        $skus = ['AFS-0317', 'AFS-0318', 'AFS-0319', 'AFS-0320', 'AFS-0321', 'AFS-0322', 'AFS-0323', 'AFS-0324', 'AFS-0325'];
-        
-        foreach ($skus as $sku) {
-            echo '<div class="etiqueta">
-                    <div class="barcode-container">' . $generator->getBarcode($sku, 1.0, 100, 'black', 0) . '</div>
-                    <div class="sku-text">' . $sku . '</div>
-                  </div>';
-        }
-        ?>
+    <div class="info-box">
+        <strong>Configuración Aplicada:</strong><br>
+        - Hoja: 96x75mm | Margen: L:2.5mm, T:6.5mm | Gaps: C:4mm, R:3mm<br>
+        - Etiqueta: 28x21mm | Texto: Arial 3.5mm<br>
+        - Barcode: CODE128, Altura 11.5mm, Narrow Bar 0.25mm (2 dots), Quiet Zone 4mm<br>
+        - Ajuste: Margen superior de 1.5mm en barcode para centrado visual<br>
+        - Render: SVG crispEdges (Sin anti-alias)
     </div>
 
-    <div class="no-print" style="max-width: 600px; background: white; padding: 15px; border-radius: 8px; margin-top: 20px; font-size: 13px; line-height: 1.4; border: 1px solid #ddd;">
-        <p style="margin-top: 0;"><strong>✅ Formato Estándar Universal:</strong></p>
-        <ul style="text-align: left; padding-left: 20px;">
-            <li><b>Formato:</b> Code 128 (Estándar puro).</li>
-            <li><b>Grosor:</b> Factor 1.0 (Sin engrosar ni adelgazar).</li>
-            <li><b>Reducción:</b> 0 (Barras estándar).</li>
-        </ul>
-        <p>Este es el formato más universal posible. Por favor, imprime esta prueba y verifica si el escáner REDPOS lo reconoce ahora.</p>
+    <button class="no-print" onclick="window.print()">IMPRIMIR PRUEBA</button>
+
+    <div class="etiquetas-container">
+        <?php foreach ($codes as $code): ?>
+            <div class="etiqueta">
+                <div class="barcode-container">
+                    <?php echo $generator->getBarcode($code, 0.25, 11.5, 'black', 4); ?>
+                </div>
+                <div class="sku-text"><?php echo htmlspecialchars($code); ?></div>
+            </div>
+        <?php endforeach; ?>
     </div>
 
 </body>
-</html>
+</html>
\ No newline at end of file