First commit

settings.php

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+<div class="wrap">
+  <h2>Tag Importer</h2>
+
+<?php
+if ( 'POST' == $_SERVER['REQUEST_METHOD'] ) {
+  $tax = $_POST['taxonomy'];
+  $terms = split("\n", $_POST['terms']);
+
+  $success = 0;
+
+  foreach ( $terms as $term ) {
+    if ( trim( $term ) > '' && wp_insert_term( $term, $tax) ) {
+      $success++;
+    }
+  }
+
+  echo "<h3>Saved $success terms.</h3>";
+  
+}
+?>
+</div>
+
+<form method="POST" action="">
+<p>Choose a taxonomy to import into:</p>
+<select name="taxonomy">
+  <option></option>
+<?php
+$args = array(
+  'public'   => true,
+  
+); 
+$output = 'names'; // or objects
+$operator = 'and'; // 'and' or 'or'
+$taxonomies = get_taxonomies( $args, $output, $operator ); 
+
+if ( $taxonomies ) {
+  sort( $taxonomies );
+  foreach ( $taxonomies as $taxonomy ) {
+    echo "<option value=\"$taxonomy\">" . $taxonomy . "</option>\n";
+  }
+}
+?>
+</select>
+
+<p>
+  Paste in your tag names (terms), one tag on each row. Duplicate tags will only be added once.
+</p>
+<textarea name="terms" rows="15" cols="60">
+  Apples
+  Oranges
+  Pears
+</textarea>
+
+<input class="button-primary" type="submit" value="Import Tags" />
+</form>

tagimporter.php

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+<?php
+/*
+Plugin Name: Tag Importer
+Plugin URI: 
+Description: Import terms (tags) into a non-hierarchical taxonomy
+Version: 0.2
+Author: Adrian Short
+Author URI: https://adrianshort.org/
+License: CC0/public domain
+*/
+
+add_action( 'admin_menu', 'as_tagimporter_menu' );
+
+// Add submenu to Tools menu
+function as_tagimporter_menu() {
+  add_submenu_page(
+    'tools.php', // top-level handle
+    'Tag Importer', // page title 
+    'Tag Importer', // submenu title
+    'manage_options', // capabilities
+    'as_tagimporter', // submenu handle
+    'as_tagimporter_page' //function
+  );
+}
+
+function as_tagimporter_page() {
+  if ( ! current_user_can( 'manage_options' ) ) {
+    wp_die("You do not have sufficient permissions to access this page.");
+  }
+  
+  require_once ( dirname( __FILE__ ) . '/settings.php' );
+}