Spanish TTS audio in the Castilian variant (es-ES) runs on a single MAI Voice 2 voice: Marta. She produces the Spanish spoken in Spain, distinct from Latin American Spanish in two main ways. First, the ceceo: the letters z and c (before e, i) are pronounced as an English th sound, not as an s. Second, the vosotros informal plural form is used. If you are producing audio for the Spain market, use Marta with the original text. If you are producing for a Latin American audience, switch to the es-MX page and pick Alejo or Valeria. Marta supports thirteen expressive styles (cheerful, sad, curious, friendly, and more), giving you room to tune tone for ads, e-learning, or audiobook drafts. For bilingual Spanish-English content, both voices handle code-switching cleanly. PDF upload preserves accents (á, é, í, ó, ú) and the inverted question/exclamation marks (¿ ¡) used in Spanish.
Related: Spanish (Mexico) variant available.