<h5>Encurte aqui sua URL</h5>
<form action="" method="post">
<label for="link"> Link: </label>
<input type="text" name="link" size="100">
<input type="hidden" name="acao" value="enviar">
<input type="submit" name="Enviar" value="Encurtar URL" class="btn btn-info">
</form>