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Speech to Speech

Commercial use OK 380+ models No watermark No sign-up needed
Model:
+ GPT-5, Claude, Gemini
174 natural AI voices across 37 languages. Type or paste text, pick a voice, and download a WAV file in seconds. Cost scales exactly with character count and the voice you pick — we quote you the token cost live as you type, before you hit generate.
0 / 5000 characters · 0 sentences Sign up free for 6× more → Cost updates live based on voice + length
Kokoro is our default — fast, natural reads. Voices auto-map to the best engine.
Live token cost
Start typing to see your cost for the selected voice.
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Show SSML tags
SSML tag cheatsheet: <break time="500ms"/> — silence / pause <prosody rate="slow" pitch="high">text</prosody> — control speed/pitch per section <emphasis level="strong">text</emphasis> — stress a word <say-as interpret-as="date">01/15/2026</say-as> — pronounce as date / number / telephone <sub alias="World Wide Web">WWW</sub> — read abbreviations correctly
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What you can make with AI voices

YouTube narration

Narrate shorts, documentaries, explainers. Kokoro handles long reads without seams; pair with the video tools to dub + caption.

Audiobooks & podcasts

Turn a blog post, transcript, or PDF into a listenable MP3. Toggle long-form stitching for chapter-scale output.

Ads & voiceovers

Pick Chatterbox for expressive reads. 30-second ad scripts cost ~150 tokens — a fraction of ElevenLabs-grade pricing.

Language learning

Hear any passage in native-sounding speech across 37 languages. Adjust speed 0.5×-2× to drill pronunciation.

Game dialogue

Prototype NPC dialogue with character voices. Dia handles multi-speaker scenes; pair emotion + pitch for villains and heroes.

Accessibility

Read-aloud for long articles, form fields, product copy. WAV export lands in any screen-reader pipeline.

How Free.ai TTS compares

What you get Free.ai ElevenLabs Play.ht Murf.ai
Free daily usage5K+ chars/day10K chars / month2.5K words10 minutes
Voices included17432~900 (premium paywall)120+
Languages373214220+
SSML support
Voice cloning includedFree$22+/mo$39+/moEnterprise
Public API
Open-source engines Kokoro, Piper, Dia…———
Sign-up requiredNoYesYesYes
Competitor figures reflect publicly listed free tiers as of 2026. Check each provider for current plan terms.
Advanced options
Result
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Want better results? Premium models (GPT-5, Claude, Gemini) deliver higher quality. View Plans

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Transform your voice into another voice in real time with free AI voice conversion.

How to Use Speech to Speech

1
Enter your input

Type text, upload a file, or describe what you want. No account needed.

2
Click generate

Our AI processes your request in seconds using the best open-source models.

3
Download & share

Download, copy, or share your result. Free for personal and commercial use.

Use this tool via API

Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.

API Documentation Get API Key 
curl -X POST https://api.free.ai/v1/tts/ \
  -H "Authorization: Bearer sk-free-..." \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello from Free.ai", "voice": "af_heart", "model": "kokoro"}'

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Speech to Speech — FAQ

Upload a voice recording and pick a target voice — the AI keeps your words and intonation but swaps the voice identity. Great for voiceover pros and content creators.

Upload a short audio clip, pick the target voice from 174 options, and click Convert. The new voice speaks your original words with matching timing.

Yes — uses your daily free token pool (2,500 guest, 5,000 registered). Speech-to-speech costs about the same as TTS by duration.

Yes. Speech-to-speech preserves the timing, emphasis, and emotional contours of your input — only the voice identity changes.

Upload MP3, WAV, M4A, or most common audio formats up to 500MB. Speech-to-speech output is delivered as a WAV file.

Yes — first clone your voice at /voice/clone/, then select your cloned voice as the target in speech-to-speech.

Very close to the target voice. Modern speech-to-speech models preserve prosody faithfully while shifting timbre to the chosen target voice.

Yes. Record a rough take with your own voice, then speech-to-speech to a professional-sounding target voice. Saves re-recording time.

Best within the same language. Cross-language speech-to-speech works but pronunciation may suffer — for translated voiceover, use TTS on the translated text.

Up to 500MB per upload. Longer clips take longer to process. For best results, split very long recordings into 5–10 minute speech-to-speech chunks.

Yes. Your input audio is processed on our GPUs and deleted after speech-to-speech completes. Nothing is stored long-term or used for training.

Podcast anonymization, voice-over redo with a professional voice, dubbing with consistent tone, character swaps for animation, and voice-acting experimentation.

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