remove Qty option from product add to cart page

Go to app/design/frontend/<theme-package>/<theme>/template/checkout/cart/item/default.phtml and find and either comment out or remove below code:

<td class="a-center"> <input name="cart[<?php echo $_item->getId() ?>][qty]" data-cart-item-id="<?php echo $this->jsQuoteEscape($_item->getSku()) ?>" value="<?php echo $this->getQty() ?>" size="4" title="<?php echo $this->__('Qty') ?>" class="input-text qty" maxlength="12" /> </td> 

Go to app/design/frontend/package/theme/template/checkout/cart/item/default.phtml

And if file not exist to copy from app/design/frontend/base/default/template/checkout/cart/item/default.phtml

and comment below code

<td class="product-cart-actions" data-rwd-label="<?php echo $this->__('Qty'); ?>"> <input type="text" pattern="\d*" name="cart[<?php echo $_item->getId() ?>][qty]" value="<?php echo $this->getQty() ?>" size="4" data-cart-item-id="<?php echo $this->jsQuoteEscape($_item->getSku()) ?>" title="<?php echo Mage::helper('core')->quoteEscape($this->__('Qty')) ?>" class="input-text qty" maxlength="12" /> <button type="submit" name="update_cart_action" data-cart-item-update value="update_qty" title="<?php echo Mage::helper('core')->quoteEscape($this->__('Update')); ?>" class="button btn-update"><span><span><?php echo $this->__('Update'); ?></span></span> </button> <ul class="cart-links"> <?php if ($isVisibleProduct): ?> <li> <a href="<?php echo $this->getConfigureUrl() ?>" title="<?php echo Mage::helper('core')->quoteEscape($this->__('Edit item parameters')) ?>"><?php echo $this->__('Edit') ?></a> </li> <?php endif ?> <?php if ($this->helper('wishlist')->isAllowInCart()) : ?> <li> <?php if ($isVisibleProduct): ?> <a href="<?php echo $this->helper('wishlist')->getMoveFromCartUrl($_item->getId()); ?>" class="link-wishlist use-ajax"><?php echo $this->__('Move to wishlist'); ?></a> <?php endif ?> </li> <?php endif ?> </ul> </td> 

Also you need to remove header of quantity

For that go to app/design/frontend/package/theme/template/checkout/cart.phtml

if not file available in theme copy from app/design/frontend/base/defualt/template/checkout/cart.phtml

and comment below code :

<th rowspan="<?php echo $mergedCells; ?>" class="a-center"> <?php echo $this->__('Qty') ?> <?php /*if ($this->helper('wishlist')->isAllowInCart()) : ?> <span class="nobr"><?php echo $this->__('Move to Wishlist') ?></span> <?php endif*/ ?> </th> 

sorry for the inconvenience

please go to this url C:\xampp\htdocs\project\app\design\frontend\base\default\template\downloadable\checkout\cart\item\default.phtml

and comment below code

<td class="a-center"> <input name="cart[<?php echo $_item->getId() ?>][qty]" value="<?php echo $this->getQty() ?>" size="4" title="<?php echo $this->__('Qty') ?>" class="input-text qty" maxlength="12"/> </td>