How to Choose the Right AI Voice for Your Project

Before you open the voice list, answer three questions: who will listen, where they will listen, and for how long. A five-minute tutorial for beginners, a 30-second product clip and a two-hour audiobook need very different voices.

• Short, energetic content (ads, short videos) benefits from a brighter voice and a slightly faster pace.
• Teaching and explainers need a clear, calm voice at a natural or slightly slower pace.
• Long listening (audiobooks, articles) needs a voice that is pleasant over time; avoid voices that feel tiring after a few minutes.

Always pick a voice made for the language your text is written in. A voice for another language will read your words with the wrong sounds, even if it understands the letters.

Then think about accent. Spanish from Spain and Spanish from Mexico, or English from the UK, the US, India or Nigeria, sound different, and listeners notice. If your audience is mostly in one country, choose a voice from that country. You can browse voices by language or by country and accent.

Open the voice directory, filter by your language, and play the short previews. Do not try to pick the winner yet; just remove the voices that are clearly wrong for your listener. Most people end up with three to five candidates.

Previews are written to sound good. Your script will not be so kind. Take a passage of about 100 to 200 words from your actual text that includes the tricky parts: names, numbers, a question, a long sentence. Paste the same passage into the Studio and generate it with each voice on your shortlist.

Listen once for each of these, and make a quick note:

• Did it pronounce names and key terms correctly?
• Do questions actually sound like questions?
• Is the pace comfortable, or do sentences run together?
• After a minute, is the voice still pleasant, or is it starting to grate?

If possible, listen on the device your audience will use: phone speakers and earbuds reveal harshness that laptop speakers hide.

Once you have a favourite, small adjustments can make it fit better. In the Studio, speed and pitch each range from -50 to +50. In practice, changes of a few steps are usually enough:

• Slow down slightly for teaching, long-form narration and listeners who are learning the language.
• Speed up slightly for short, upbeat content.
• Lower the pitch a little for a calmer, more serious tone; raise it a little for a lighter one.

Large changes in either direction make every voice sound artificial. If a voice only works at an extreme setting, it is probably the wrong voice. Pacing between sentences is better controlled with punctuation and pause tags than with the speed slider.

Write down the voice name and your speed and pitch values. Using the same voice and settings across a whole video series, course or book helps listeners recognise your content and makes separately generated parts sound like one recording.