AI voiceover on your computer
From a short script to a full chapter
LongTTS is a local AI voiceover app for Mac and Windows. Turn video scripts, lessons, and novel chapters into complete WAV or MP3 files with automatic text segmentation. Choose a built-in voice or clone your own, then adjust speed and emotion. After license activation and required model downloads, synthesize speech offline; scripts and generated audio stay on your computer.
Supports macOS (Intel / Apple silicon) and Windows 10/11
A voiceover powerhouse built for long-form content
YouTube explainers, TikTok videos, audiobooks, podcasts, and multilingual learning content—all in one tool.
Turn long-form text into audio in one click
Smart, sentence-aware segmentation recognizes ellipses, quotations, and abbreviations. Paste anything from an essay to an entire novel and LongTTS processes it in the background, then exports one complete WAV or MP3 file.
30+ voices with adjustable emotion
Choose from 30+ premium voices, including warm male voices, bright female voices, narrative styles, and multilingual speakers. Fine-tune emotional intensity or upload and record a reference to clone your own voice.
Offline synthesis after setup
License activation and required model downloads may need a connection. After those steps, speech synthesis can run fully offline; scripts and generated audio are not uploaded.
Simple by design
A visual workflow with just two essential controls—emotion and speed—plus presets for natural delivery, news, film commentary, and more. Get started in a minute.
Record and clone in one place
A built-in recording studio in Voice Manager: read a short script into your mic with live level monitoring and one-click retakes—no external tools needed to turn a real voice into a reusable voiceover preset.
Unlimited generation for personal or commercial work
Generate locally with no usage limits. Choose monthly, annual, or lifetime licensing for personal projects and paid client work.
Generate, review, and revise on your own computer
Your computer runs the speech model. Set it up once, then build a repeatable workflow for scripts you need to revise.
Video scripts, lessons, and narration
Paste a script into the workspace, select a voice, and test a short passage before generating the full recording. Revise names, numbers, or abbreviations when needed. Export WAV for editing or MP3 for a smaller listening copy.
Local synthesis has no per-character generation charge and does not upload your scripts or generated audio. Use source text and reference recordings you have permission to use.
Offline speech synthesis after setup
The installer includes the runtime. License activation and model downloads may need a connection. Once setup is complete and your license is valid, synthesis can run offline. A model you have not downloaded needs to be prepared online first.
Generation speed depends on your computer, model, and script length. Test a representative paragraph, then generate and review long projects chapter by chapter.
Read the local voiceover workflow →Hear the results before you decide
Listen to real audio generated by LongTTS in different voices and styles. Every sample was synthesized locally with no post-processing.
Sample Script
LongTTS is a privacy-first desktop app for macOS and Windows that turns long-form text into natural, expressive speech — completely offline. No cloud, no uploads, no surprises: your scripts and voices never leave your machine. Whether you're narrating a documentary, producing an audiobook, or dubbing a video, LongTTS handles hours of text with smart, sentence-aware segmentation and studio-grade voice cloning. Pick from built-in presets tuned for news, film commentary, or emotional storytelling — or clone your own voice in seconds. Supports 23 languages, exports to WAV or MP3, and keeps a full history of every take. Your voice, your data, your machine.
Note: this is the transcript of an existing audio sample. “Offline” in the recording refers to synthesis after license activation and required model downloads.
An interactive demo of the desktop interface
The same workspace as the desktop app, recreated for the web: switch views in the sidebar, edit the script, pick a scene and a voice, and create a demo task. The demo never synthesizes audio, and nothing you type is uploaded.
Who uses LongTTS
Global E-commerce
Create multilingual voiceovers for Amazon, TikTok, and direct-to-consumer product videos at scale and at a lower cost.
Content Creation
Produce narration for YouTube, TikTok, and social video every day with natural, presenter-quality audio.
Education
Create adjustable-speed listening materials and read-along audio in Chinese, English, Japanese, Korean, and more.
Accessible Reading
Turn documents, papers, and ebooks into audio, then listen during your commute and give your eyes a break.
From a long script to a finished recording
See the workflow before you download: preparing a script, choosing a voice, checking the output, and exporting audio.
Offline long-form text to speech
What to prepare, how segmentation works, and what to check before publishing a long recording.
Read the guide → Use-case guideTurn a novel or story into audio
A chapter-by-chapter process for pronunciation, voice consistency, spot checks, and export.
Read the guide →Flexible licensing
Run locally with unlimited generations. Choose the license that fits your workflow.
Monthly
A flexible way to get started
- All 30+ built-in voices
- Unlimited long-form generation
- Custom voice cloning
- License for 1 device
Annual
Best value for ongoing creation
- Everything in Monthly
- Premium voices included
- Priority remote setup help
- License for 1 device
Lifetime
Pay once, use forever
- Everything in Annual
- Lifetime use with no renewal
- Step-by-step guides + remote help
- License for 1 device
USD amounts are approximate conversions at $1 = ¥6.7129. License prices are ¥9.90 monthly, ¥99 annually, or ¥399 for lifetime use. Email us before paying if you need to confirm the amount in another currency.
Pay with PayPal, receive your license by email
- Send the payment with PayPal. Choose your plan above, then send its payment to pruas1024@gmail.com. Check the recipient email and payment amount before confirming in PayPal.
- Email your transfer screenshot. Send an email to pruas1024@gmail.com with the payment screenshot attached. Include your chosen plan so we can match the payment to your license.
- Wait for a reply with your activation code. License delivery is handled manually by email. Once the reply arrives, enter the code in the desktop app to activate it.
The email button opens your mail app. Attach the screenshot yourself before sending. Payment alone does not issue an activation code automatically.
Download LongTTS
We detect your platform automatically. Choose the matching installer below.
Support that gets you up and running
You get more than an installer. Our onboarding support helps every user install LongTTS successfully and start creating.