diff --git a/src/Spout/Common/Entity/Row.php b/src/Spout/Common/Entity/Row.php
index 0cc49c7..4fba9b4 100644
--- a/src/Spout/Common/Entity/Row.php
+++ b/src/Spout/Common/Entity/Row.php
@@ -18,6 +18,12 @@ class Row
      */
     protected $style;
 
+    /**
+     * Row height (default is 15)
+     * @var string
+     */
+    protected $height = "15";
+
     /**
      * Row constructor.
      * @param Cell[] $cells
@@ -126,4 +132,24 @@ class Row
             return $cell->getValue();
         }, $this->cells);
     }
+
+    /**
+     * Set row height
+     * @param String $height
+     * @return Row
+     */
+    public function setHeight($height)
+    {
+        $this->height = $height;
+        return $this;
+    }
+
+    /**
+     * Returns row height
+     * @return String
+     */
+    public function getHeight()
+    {
+        return $this->height;
+    }
 }
diff --git a/src/Spout/Common/Entity/Style/Style.php b/src/Spout/Common/Entity/Style/Style.php
index 7e989a4..40c9f20 100644
--- a/src/Spout/Common/Entity/Style/Style.php
+++ b/src/Spout/Common/Entity/Style/Style.php
@@ -66,6 +66,9 @@ class Style
     /** @var bool Whether the wrap text property was set */
     private $hasSetWrapText = false;
 
+    private $shrinkToFit = false;
+    private $shouldShrinkToFit = false;
+
     /** @var Border */
     private $border;
 
@@ -463,4 +466,24 @@ class Style
     {
         return $this->hasSetFormat;
     }
+
+    /**
+     * Sets should shrink to fit
+     * @param bool $shrinkToFit
+     * @return Style
+     */
+    public function setShouldShrinkToFit($shrinkToFit = true)
+    {
+        $this->shrinkToFit = $shrinkToFit;
+        $this->shouldShrinkToFit = $shrinkToFit;
+        return $this;
+    }
+
+     /**
+     * @return bool Whether format should be applied
+     */
+    public function shouldShrinkToFit()
+    {
+        return $this->shouldShrinkToFit;
+    }
 }
diff --git a/src/Spout/Common/Manager/OptionsManagerAbstract.php b/src/Spout/Common/Manager/OptionsManagerAbstract.php
index 5670b95..672f6fd 100644
--- a/src/Spout/Common/Manager/OptionsManagerAbstract.php
+++ b/src/Spout/Common/Manager/OptionsManagerAbstract.php
@@ -51,6 +51,21 @@ abstract class OptionsManagerAbstract implements OptionsManagerInterface
         }
     }
 
+    /**
+     * Add an option to the internal list of options
+     * Used only for mergeCells() for now
+     * @return void
+     */
+    public function addOption($optionName, $optionValue)
+    {
+        if (\in_array($optionName, $this->supportedOptions)) {
+            if (!isset($this->options[$optionName])) {
+                $this->options[$optionName] = [];
+            }
+            $this->options[$optionName][] = $optionValue;
+        }
+    }
+
     /**
      * @param string $optionName
      * @return mixed|null The set option or NULL if no option with given name found
diff --git a/src/Spout/Writer/Common/Creator/Style/StyleBuilder.php b/src/Spout/Writer/Common/Creator/Style/StyleBuilder.php
index bc2d406..8c48848 100644
--- a/src/Spout/Writer/Common/Creator/Style/StyleBuilder.php
+++ b/src/Spout/Writer/Common/Creator/Style/StyleBuilder.php
@@ -183,6 +183,17 @@ class StyleBuilder
         return $this;
     }
 
+    /**
+     * Set should shrink to fit
+     * @param boolean $shrinkToFit
+     * @return void
+     */
+    public function setShouldShrinkToFit($shrinkToFit = true)
+    {
+        $this->style->setShouldShrinkToFit($shrinkToFit);
+        return $this;
+    }
+
     /**
      * Returns the configured style. The style is cached and can be reused.
      *
diff --git a/src/Spout/Writer/Common/Entity/Options.php b/src/Spout/Writer/Common/Entity/Options.php
index d7152bb..0baa628 100644
--- a/src/Spout/Writer/Common/Entity/Options.php
+++ b/src/Spout/Writer/Common/Entity/Options.php
@@ -20,4 +20,10 @@ abstract class Options
 
     // XLSX specific options
     const SHOULD_USE_INLINE_STRINGS = 'shouldUseInlineStrings';
+
+    // XLSX column widths
+    const COLUMN_WIDTHS = 'columnWidths';
+
+    // XLSX merge cells
+    const MERGE_CELLS = 'mergeCells';
 }
diff --git a/src/Spout/Writer/Common/Entity/Sheet.php b/src/Spout/Writer/Common/Entity/Sheet.php
index aabdd91..6391571 100644
--- a/src/Spout/Writer/Common/Entity/Sheet.php
+++ b/src/Spout/Writer/Common/Entity/Sheet.php
@@ -27,6 +27,9 @@ class Sheet
     /** @var SheetManager Sheet manager */
     private $sheetManager;
 
+    /** @var bool Sheet is started */
+    private $isSheetStarted = false;
+
     /**
      * @param int $sheetIndex Index of the sheet, based on order in the workbook (zero-based)
      * @param string $associatedWorkbookId ID of the sheet's associated workbook
@@ -108,4 +111,23 @@ class Sheet
 
         return $this;
     }
+
+    /**
+     * @return bool isSheetStarted Sheet was started
+     */
+    public function isSheetStarted()
+    {
+        return $this->isSheetStarted;
+    }
+
+    /**
+     * @param bool $isSheetStarted Set if sheet was started
+     * @return Sheet
+     */
+    public function setIsSheetStarted($isSheetStarted)
+    {
+        $this->isSheetStarted = $isSheetStarted;
+
+        return $this;
+    }
 }
diff --git a/src/Spout/Writer/WriterMultiSheetsAbstract.php b/src/Spout/Writer/WriterMultiSheetsAbstract.php
index 8170b67..ec84e44 100644
--- a/src/Spout/Writer/WriterMultiSheetsAbstract.php
+++ b/src/Spout/Writer/WriterMultiSheetsAbstract.php
@@ -61,6 +61,29 @@ abstract class WriterMultiSheetsAbstract extends WriterAbstract
         return $this;
     }
 
+    /**
+     * Set columns widths as list. If value is null will set column with default width (8.43)
+     * @param array $columnWidths
+     * @return WriterMultiSheetsAbstract
+     */
+    public function setColumnWidths(array $columnWidths)
+    {
+        $this->optionsManager->setOption(Options::COLUMN_WIDTHS, $columnWidths);
+        return $this;
+    }
+
+    /**
+     * Undocumented function
+     *
+     * @param array $range
+     * @return void
+     */
+    public function mergeCells(array $range1, array $range2)
+    {
+        $this->optionsManager->addOption(Options::MERGE_CELLS, [$range1, $range2]);
+        return $this;
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/src/Spout/Writer/XLSX/Manager/OptionsManager.php b/src/Spout/Writer/XLSX/Manager/OptionsManager.php
index d3b5cd4..40e299e 100644
--- a/src/Spout/Writer/XLSX/Manager/OptionsManager.php
+++ b/src/Spout/Writer/XLSX/Manager/OptionsManager.php
@@ -39,6 +39,8 @@ class OptionsManager extends OptionsManagerAbstract
             Options::DEFAULT_ROW_STYLE,
             Options::SHOULD_CREATE_NEW_SHEETS_AUTOMATICALLY,
             Options::SHOULD_USE_INLINE_STRINGS,
+            Options::COLUMN_WIDTHS,
+            Options::MERGE_CELLS,
         ];
     }
 
@@ -56,5 +58,7 @@ class OptionsManager extends OptionsManagerAbstract
         $this->setOption(Options::DEFAULT_ROW_STYLE, $defaultRowStyle);
         $this->setOption(Options::SHOULD_CREATE_NEW_SHEETS_AUTOMATICALLY, true);
         $this->setOption(Options::SHOULD_USE_INLINE_STRINGS, true);
+        $this->setOption(Options::COLUMN_WIDTHS, []);
+        $this->setOption(Options::MERGE_CELLS, []);
     }
 }
diff --git a/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php b/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php
index f0ca9d9..b79b1da 100644
--- a/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php
+++ b/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php
@@ -258,6 +258,10 @@ EOD;
                 if ($style->shouldWrapText()) {
                     $content .= ' wrapText="1"';
                 }
+                if ($style->shouldShrinkToFit()) {
+                    $content .= ' shrinkToFit="true"';
+                }
+
                 $content .= '/>';
                 $content .= '</xf>';
             } else {
diff --git a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
index 741d0aa..2cac24b 100644
--- a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
+++ b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
@@ -37,6 +37,8 @@ class WorksheetManager implements WorksheetManagerInterface
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
 EOD;
+    /** @var OptionsManagerInterface */
+    private $optionsManager;
 
     /** @var bool Whether inline or shared strings should be used */
     protected $shouldUseInlineStrings;
@@ -84,6 +86,7 @@ EOD;
         StringHelper $stringHelper,
         InternalEntityFactory $entityFactory
     ) {
+        $this->optionsManager = $optionsManager;
         $this->shouldUseInlineStrings = $optionsManager->getOption(Options::SHOULD_USE_INLINE_STRINGS);
         $this->rowManager = $rowManager;
         $this->styleManager = $styleManager;
@@ -113,7 +116,6 @@ EOD;
         $worksheet->setFilePointer($sheetFilePointer);
 
         \fwrite($sheetFilePointer, self::SHEET_XML_FILE_HEADER);
-        \fwrite($sheetFilePointer, '<sheetData>');
     }
 
     /**
@@ -153,11 +155,28 @@ EOD;
      */
     private function addNonEmptyRow(Worksheet $worksheet, Row $row)
     {
+        if (!$worksheet->getExternalSheet()->isSheetStarted()) {
+            // create nodes for columns widths
+            if ($this->optionsManager->getOption(Options::COLUMN_WIDTHS)) {
+                $colsString = '<cols>';
+                foreach ($this->optionsManager->getOption(Options::COLUMN_WIDTHS) as $index => $width) {
+                    $index++;
+                    $colsString.= '<col collapsed="false" customWidth="true" hidden="false" outlineLevel="0" style="0" max="'.$index.'" min="'.$index.'"  width="'.$width.'"/>';
+                }
+                $colsString.="</cols>";
+                \fwrite($worksheet->getFilePointer(), $colsString);
+            }
+
+            \fwrite($worksheet->getFilePointer(), '<sheetData>');
+            $worksheet->getExternalSheet()->setIsSheetStarted(true);
+        }
+
         $rowStyle = $row->getStyle();
         $rowIndexOneBased = $worksheet->getLastWrittenRowIndex() + 1;
         $numCells = $row->getNumCells();
+        $rowHeight = $row->getHeight();
 
-        $rowXML = '<row r="' . $rowIndexOneBased . '" spans="1:' . $numCells . '">';
+        $rowXML = '<row r="' . $rowIndexOneBased . '" spans="1:' . $numCells . '" customHeight="true"' . ' ht="'. $rowHeight  .  '">';
 
         foreach ($row->getCells() as $columnIndexZeroBased => $cell) {
             $rowXML .= $this->applyStyleAndGetCellXML($cell, $rowStyle, $rowIndexOneBased, $columnIndexZeroBased);
@@ -270,7 +289,26 @@ EOD;
             return;
         }
 
+        if (!$worksheet->getExternalSheet()->isSheetStarted()) {
+            \fwrite($worksheetFilePointer, '<sheetData>');
+            $worksheet->getExternalSheet()->setIsSheetStarted(true);
+        }
+
         \fwrite($worksheetFilePointer, '</sheetData>');
+
+        // create nodes for merge cells
+        if ($this->optionsManager->getOption(Options::MERGE_CELLS)) {
+            $mergeCellString = '<mergeCells count="'.count($this->optionsManager->getOption(Options::MERGE_CELLS)).'">';
+            foreach ($this->optionsManager->getOption(Options::MERGE_CELLS) as $values) {
+                $output = array_map(function($value){
+                    return CellHelper::getColumnLettersFromColumnIndex($value[0]) . $value[1];
+                }, $values);
+                $mergeCellString.= '<mergeCell ref="'.implode(':', $output).'"/>';
+            }
+            $mergeCellString.= '</mergeCells>';
+            \fwrite($worksheet->getFilePointer(), $mergeCellString);
+        }
+
         \fwrite($worksheetFilePointer, '</worksheet>');
         \fclose($worksheetFilePointer);
     }