snippet-file upload limit to 850KB

// WP - LIMIT IMAGE UPLOAD SIZE
function max_image_size( $file ) {
  $size = $file['size'];
  $size = $size / 1024;
  $type = $file['type'];
  $is_image = strpos( $type, 'image' ) !== false;
  $limit = 850;  
  $limit_output = '850KB';
  if ( $is_image && $size > $limit ) {
    $file['error'] = 'Image files must be smaller than ' . $limit_output;
  }//end if
  return $file;
}//end max_image_size()
add_filter( 'wp_handle_upload_prefilter', 'max_image_size' );

// WP - LIMIT IMAGE UPLOAD SIZE - CHANGE FRONT END TEXT
add_action('wp_head', 'file_size_limit_string');
function file_size_limit_string(){
?>
<script type="text/javascript">
(function($){
$(document).ready(function($){
//CHANGE THE FILE UPLOAD SIZE LIMIT MESSAGE ON FRONT-END IMAGE UPLOADERS
$('#submit-job-form .file-upload-field small').text('Maximum file size: 850KB.');
});
})(jQuery);
</script>
<?php
}