Gemini Text-to-Speech

Plans and prices

Every plan, in full

On the record

API access

Yesai.google.dev · read 20 Sep 2026

Commercial use

Yesai.google.dev · read 20 Sep 2026

Custom voice limits

Stored custom voices have a maximum of 200 per project and a one-year TTL; stateless voice keys have a seven-day TTL.ai.google.dev · read 11 Oct 2026

Data use

For paid services, Google says prompts and responses are not used to improve its products, while they may be logged for a limited period to detect and prevent policy violations and meet legal disclosures.ai.google.dev · read 11 Oct 2026

Export formats

WAV,PCMai.google.dev · read 20 Sep 2026

Free-tier data use

The pricing page marks free-tier TTS content as used to improve Google products and paid-tier content as not used for that purpose.ai.google.dev · read 11 Oct 2026

Integrations

The guide documents Python and JavaScript/TypeScript SDKs, Go, and REST API usage.ai.google.dev · read 11 Oct 2026

Languages

78ai.google.dev · read 20 Sep 2026

Languages

The models automatically detect input language; Flash TTS supports over 130 languages and Flash-Lite supports over 100.ai.google.dev · read 11 Oct 2026

Limits

TTS accepts text-only input and produces audio-only output; one multi-speaker request supports up to two speakers using prebuilt voices.ai.google.dev · read 11 Oct 2026

Model choices

Gemini 3.8 Flash TTS targets studio-grade fidelity, expressive acting, and long-form stability, while Flash-Lite targets high-throughput, low-latency, cost-efficient conversational speech.ai.google.dev · read 11 Oct 2026

Streaming and formats

Requests can stream audio; unary output defaults to WAV and streaming output defaults to raw 24 kHz mono 16-bit PCM, with other listed encodings including mu-law and A-law.ai.google.dev · read 11 Oct 2026

Style control

Structured speech metadata and inline vocal tags can guide style, accent, pace, tone, pauses, and vocal events.ai.google.dev · read 11 Oct 2026

Testing

Google AI Studio is provided as a place to try Gemini TTS models before building.ai.google.dev · read 11 Oct 2026

Use cases

The TTS API is intended for exact text recitation with fine-grained control, including podcast or audiobook generation.ai.google.dev · read 11 Oct 2026

Voice library

Developers can select prebuilt voices, browse an Extended Voice Library, or use designed and replicated voice IDs.ai.google.dev · read 11 Oct 2026

What it does

The Gemini API converts text into single-speaker or multi-speaker audio.ai.google.dev · read 11 Oct 2026

Alternatives to Gemini Text-to-Speech

GC Google Cloud Text-to-SpeechAndroidiPhone & iPad+2 V VoiceboxAndroidiPhone & iPad+6 RA Resemble AIAndroidiPhone & iPad+7 T TypecastAndroidiPhone & iPad+2 N NaturalReaderAndroidiPhone & iPad+4 S SpeechifyAndroidiPhone & iPad+5 T TTSReaderAndroidiPhone & iPad+5 I iSpeechAndroidiPhone & iPad+6

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