diff --git a/src/ConverterHelpers.php b/src/ConverterHelpers.php
new file mode 100644
index 0000000..dc412c2
--- /dev/null
+++ b/src/ConverterHelpers.php
@@ -0,0 +1,24 @@
+<?php
+namespace CSO\Excel2Html;
+use CSO\Excel2Html\Exceptions\MalformattedRangeStringException;
+
+class ConverterHelpers{
+    /**
+     * Converts a range string to a columns array
+     * @param string $range range string like 'A-C'
+     * @return string[] array of all columns in the range like ['A','B','C']
+     */
+    public static function RangeToColumnArray(string $range): array{
+        $rangeArray = explode("-",$range);
+        if(count($rangeArray) !== 2){
+            throw new MalformattedRangeStringException();
+        }
+        
+        $columns = [];
+        for($column = $rangeArray[0]; $column !== $rangeArray[1]; ++$column) {
+            array_push($columns, $column);
+        }
+        array_push($columns, $column);
+        return $columns;
+    }
+}
\ No newline at end of file
diff --git a/src/HtmlConverter.php b/src/HtmlConverter.php
index 2211e43..6e4decd 100644
--- a/src/HtmlConverter.php
+++ b/src/HtmlConverter.php
@@ -26,7 +26,18 @@ class HtmlConverter {
     //ctor
     private function __construct(Worksheet $worksheet, int $styleOption = 0, array|null $columns = null, float $scale = 1.0){
         $this->styleOption = $styleOption;
-        $this->columns = $columns;
+        if(!is_null($columns)){
+            $tmpColumns = [];
+            foreach($columns as $col){
+                if(str_contains($col, "-")){
+                    $tmpColumns = array_merge($tmpColumns, ConverterHelpers::RangeToColumnArray($col));
+                }
+                else{
+                    array_push($tmpColumns, $col);
+                }
+            }
+            $this->columns = $tmpColumns;
+        }
         $this->scale = $scale;
         $this->worksheet = $worksheet;
         $this->html = '';
@@ -190,7 +201,8 @@ class HtmlConverter {
         do {
             ++$row;
             $array = $this->worksheet->rangeToArray($minCol.$row.':'.$maxCol.$row);
-            $value = trim(implode($array));
+            $valString = implode($array[$row]);
+            $value = trim($valString);
         } while ($row <= $highestRow && is_null($value));
         ++$row;
         return $row;
diff --git a/src/exceptions/MalformattedRangeStringException.php b/src/exceptions/MalformattedRangeStringException.php
new file mode 100644
index 0000000..9dbcd70
--- /dev/null
+++ b/src/exceptions/MalformattedRangeStringException.php
@@ -0,0 +1,9 @@
+<?php
+namespace CSO\Excel2Html\Exceptions;
+
+class MalformattedRangeStringException extends \Exception {
+
+    public function __construct(string $message = "", int $code = 0, \Throwable $previous = null){
+        parent::__construct($message, $code, $previous);
+    }
+}
\ No newline at end of file
diff --git a/tests/ConverterHelpersTest.php b/tests/ConverterHelpersTest.php
new file mode 100644
index 0000000..f86afe1
--- /dev/null
+++ b/tests/ConverterHelpersTest.php
@@ -0,0 +1,11 @@
+<?php
+use CSO\Excel2Html\ConverterHelpers;
+use PHPUnit\Framework\TestCase;
+
+final class ConverterHelpersTest extends TestCase{
+    public function testColumnRangeWorkingAsExpected(): void{
+        $columns = ConverterHelpers::RangeToColumnArray("Y-AC");
+        $res = implode("|", $columns);
+        $this->assertSame('Y|Z|AA|AB|AC', $res);
+    }
+}
\ No newline at end of file
diff --git a/tests/HtmlConverterTest.php b/tests/HtmlConverterTest.php
index 8490eb1..f87a01a 100644
--- a/tests/HtmlConverterTest.php
+++ b/tests/HtmlConverterTest.php
@@ -1,4 +1,5 @@
 <?php
+use CSO\Excel2Html\ConverterHelpers;
 use CSO\Excel2Html\Exceptions\SheetNotFoudException;
 use PHPUnit\Framework\TestCase;
 use CSO\Excel2Html\HtmlConverter;
@@ -61,6 +62,17 @@ final class HtmlConverterTest extends TestCase{
         $expected = file_get_contents('tests/assets/results/testProp.html');
         $this->assertSame($expected, $res);
     }
+    public function testHtmlPropIsSameWithRange(): void{
+        $conv = HtmlConverter::fromFilepath(
+            'tests/assets/test.xlsx', 
+            styleOption: StyleOptions::WITH_COLUMN_WIDTH | StyleOptions::COLUMN_WIDTH_PROPORTIONAL, 
+            worksheetName:'TestTable', 
+            columns:['A', 'B-F'],
+            scale: 1.1);
+        $res = $conv->getHtml();
+        $expected = file_get_contents('tests/assets/results/testProp.html');
+        $this->assertSame($expected, $res);
+    }
 
     //Exceptions
     public function testCannotReadFromUnknownSheet(): void{
@@ -72,29 +84,4 @@ final class HtmlConverterTest extends TestCase{
             columns:['A', 'B', 'C', 'D', 'E', 'F'],
             scale: 1.1);
     }
-    public function testCannotReadFromUnknownColumn(): void{
-        $this->expectExceptionMessage('Invalid cell coordinate -1');
-        $conv = HtmlConverter::fromFilepath(
-            'tests/assets/test.xlsx', 
-            styleOption: StyleOptions::WITH_COLUMN_WIDTH | StyleOptions::COLUMN_WIDTH_PROPORTIONAL, 
-            worksheetName:'TestTable', 
-            columns:['A', 'B', 'C', 'D', 'E', 'F', '-1'],
-            scale: 1.1);
-        $res = $conv->getHtml();
-    }
-    public function testColumnRangeWorkingAsExpected(): void{
-        $columnRange = function($startColumn, $endColumn) {
-            ++$endColumn;
-            for($column = $startColumn; $column !== $endColumn; ++$column) {
-                yield $column;
-            }
-        };
-        
-        $res = '';
-        foreach($columnRange('Y', 'AC') as $column) {
-            $res .= '|'.$column;
-        }
-
-        $this->assertSame('|Y|Z|AA|AB|AC', $res);
-    }
 }
\ No newline at end of file