Index TTS
Index TTS AIオーディオジェネレーターは、テキストを自然で表現豊かな音声に変換する強力なツールで、明確な発音、リアルな声、柔軟なオーディオ生成を備えています。
ドキュメント
What Is IndexTTS?
IndexTTS is an online AI text-to-speech and zero-shot voice cloning platform built on the IndexTTS model family. Enter text, upload an authorized reference voice, preview the result, and regenerate as needed.
Compared with local GitHub / Hugging Face installs, this hosted path skips environment setup so you can validate voice quality, cloning, and delivery controls in the browser first. Prefer full local control? Use the upstream open-source project when you need private GPU infrastructure.
The homepage generator runs IndexTTS 2.5. IndexTTS 2 remains available on its dedicated page. The original open-source IndexTTS release is for local installation, not this browser demo.
Credits are simple: 1 credit = 1 second of generated audio, and new accounts get 100 free registration credits. See Pricing for packs after the free allowance.
Browser-ready IndexTTS 2.5
Generate in the browser without installing CUDA, cloning the GitHub repo, or downloading Hugging Face weights first.
Short-reference voice cloning
Guide new speech with a clean 3–10 second authorized reference recording — no separate speaker training step.
Expression and multilingual controls
Use IndexTTS 2.5 for emotion, timing, pronunciation, and multilingual workflows when the model supports them.
Still open source upstream
Prefer local GPU control? The upstream IndexTTS project remains available on GitHub and Hugging Face. This site is the hosted online path.
Hear the Evidence: Cloning, Emotion, and Narration
Play real reference/generated pairs from our English IndexTTS 2.5 review, official emotion demos, and narration samples. No fabricated clips — only assets already on this site or from the official demos.
Reference vs generated
Same target sentence, different reference voices. Compare the LibriSpeech references with IndexTTS 2.5 outputs from our English review set.
Male reference
ReferenceEnglishMaleLibriSpeech
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Generated from male reference
IndexTTS 2.5EnglishGeneratedMale ref
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About this clip
Same new sentence conditioned on the male reference (review E03).
Female reference
ReferenceEnglishFemaleLibriSpeech
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Generated from female reference
IndexTTS 2.5EnglishGeneratedFemale ref
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About this clip
Same new sentence conditioned on the female reference (review E04).
Emotion control
Official IndexTTS 2.5 English emotion examples — same model family as the homepage demo.
Happy
IndexTTS 2.5EnglishHappy
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Spoken text
“I was chatting with an old classmate and we laughed so hard, tears almost came out.”
Sad
IndexTTS 2.5EnglishSad
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Spoken text
“I feel like I'm lost in the darkness and can't find a way out anymore.”
Angry
IndexTTS 2.5EnglishAngry
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Spoken text
“If you'd ever treated me like a human being, would they have dared to do this?”
Emotion vector (neutral → sad)
IndexTTS 2.5EnglishNeutral vs sad vector
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Spoken text
Identical text and female reference; sad vector 0.8 from the English review (pair with E12 on the review page).
Natural zero-shot narration
Official IndexTTS 2.5 English narration samples for everyday news-style delivery.
Natural English narration
IndexTTS 2.5EnglishZero-shot
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Spoken text
“Animal Liberation and the RSPCA are again calling for mandatory CCTV cameras in Australian abattoirs.”
Longer news-style line
IndexTTS 2.5EnglishZero-shot
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Spoken text
“The U.S. says it received information mentioning potential attacks on prominent landmarks in Ethiopia and Kenya.”
Faster duration control
IndexTTS 2EnglishDuration 0.75×
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Spoken text
“The equipment needed to do this includes rock saws and polishers.”
Slower duration control
IndexTTS 2EnglishDuration 1.25×
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Spoken text
“The equipment needed to do this includes rock saws and polishers.”
Want the full measurement notes? Read the IndexTTS 2.5 English review →
Compare IndexTTS Models
Pick the model that matches your workflow. The tool above is IndexTTS 2.5; IndexTTS 2 has its own page; the original release is open-source for local installs.
| Model | Best for | On this site | Next step |
|---|---|---|---|
| IndexTTS (original) | Open-source baseline TTS and reference cloning | Not in the browser demo | GitHub / local install → |
| IndexTTS 2 | Expressive speech, emotion, and duration control | Available on the IndexTTS 2 page | Open IndexTTS 2 → |
| IndexTTS 2.5 | Multilingual speech plus cloning and delivery controls | Homepage demo (try above) | Open IndexTTS 2.5 → |
How to Use IndexTTS in 4 Steps
Enter your text, upload a short authorized reference voice, generate with the IndexTTS 2.5 demo, then preview and refine until it sounds right.
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01 — Enter Your Text
Add the script, dialogue, narration, or other text you want IndexTTS to turn into speech. -
02 — Upload a Reference Voice
Upload a clean reference recording from a voice you own or have permission to use. -
03 — Generate with IndexTTS 2.5
The homepage demo runs IndexTTS 2.5. Adjust supported delivery settings, then generate and preview before refining your script. -
04 — Preview and Refine
Listen to the result, update text or the reference clip, and regenerate until the audio fits your project.
Want a step-by-step guide? Read How to Use IndexTTS →
01
Video Voiceovers
Create AI voiceovers for explainers, tutorials, product videos, social content, and other visual media.
02
Character Dialogue
Generate new dialogue from an authorized reference voice for characters, storytelling, games, and creative projects.
03
Multilingual and Localized Content
Use supported IndexTTS models to create speech for multilingual and localized content workflows.
04
Education and Learning
Turn lessons, guides, training materials, and educational content into clear spoken audio.
05
Podcasts and Audiobooks
Generate narration in sections so individual lines, chapters, or passages can be revised and regenerated as needed.
06
AI Assistants and Prototypes
Add generated speech to AI assistants, product demos, learning tools, characters, and other interactive experiences.
Simple Credit Pricing
1 credit = 1 second of generated audio. New accounts get 100 free registration credits (~100 seconds). After that, buy one-time credit packs — no subscription required.
IndexTTS FAQ
Find answers about IndexTTS, AI text-to-speech, zero-shot voice cloning, reference audio, model selection, pricing, and usage.
Start Generating with IndexTTS
Sign in for 100 free credits, upload a short authorized reference recording, and generate with the IndexTTS 2.5 online demo — or follow the step-by-step guide.
Use only voices you own or have permission to use.