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Neolli supports 10 languages for transcription, 30 languages for translation, and 10 languages for voice-cloned dubbing.
Capability breakdown: Not every language supports all three features. Transcription requires a trained speech recognition model. Voice cloning requires a compatible TTS model. Translation is available for all 30 languages.

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Language matrix

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Language codes

Neolli uses ISO 639-3 (3-letter) language codes internally. These codes appear in API responses and export filenames.

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Language presets

When adding languages for translation, you can use presets to quickly select popular languages:
  • Top 3 — English, Spanish, Portuguese (covers ~60% of global YouTube viewers)
  • Top 5 — Adds French and German
  • Top 10 — Adds Italian, Russian, Japanese, Korean, and Chinese (~85% coverage)
These presets are based on YouTube audience reach data and optimized for content creators targeting international audiences.

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Auto-detect (transcription)

When starting a transcription, you can choose Auto-detect instead of selecting a specific language. Auto-detect works reliably for the 10 supported transcription languages. For best accuracy with less common languages, select the language explicitly.