Convert PDF, EPUB, DOCX and TXT files to MP3 or M4B audio online
Free 3D room acoustics solver and acoustic treatment calculator
Stage
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Founded
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Based in
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HU
Pricing model
Freemium
Free
Pricing
Free: Standard voices with 50,000 characters per day limit for signed-in users. Premium: Pay-as-you-go credits starting at $5.99 for 5,000 credits, $15 for 15,000 credits, $30 for 30,000 credits, or $50 for 50,000 credits. Credits are valid for 1 year.
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Key features
Convert PDF, EPUB, DOCX and TXT files to MP3 or M4B audio
300+ Standard voices in 30+ languages
800+ Premium AI voices via ElevenLabs and Gemini
Select pages or chapters before conversion
Review and edit extracted text before converting
Download as ZIP of MP3 files or single M4B audiobook
Background conversion for Premium users
Re-download audio for 7 days after generation
Voice cloning with ElevenLabs
Privacy-first: documents parsed in browser, never uploaded to servers
3D room builder supporting odd-shaped rooms, sloped ceilings, and attic layouts
Real physics-based acoustic treatment recommendation
Material absorption modeling with coefficients from frontier research
Real product database with 175 products across 37 brands
Before-and-after frequency response and decay time visualization
Studio mode for production work alongside listening room workflow
Rapid analysis completing in 2-10 seconds for position searches and up to a minute for panel placement
Guest access without account signup for full analysis
Room design persistence with optional account creation
What makes it different
Built specifically for long documents with chapter selection and text preview
Free tier with 50,000 characters daily allowance, no credit card required
Access to premium AI voices from ElevenLabs and Google Gemini with pay-as-you-go pricing
Document privacy: file parsing happens in browser, sensitive content never uploaded
Uses real room physics and first principles acoustics rather than generic rules
Optimizes for both speaker placement and listening position simultaneously
No account or sign-up required to design and analyze full systems
Handles complex room geometries including sloped ceilings and L-shaped layouts
Integrates real speaker and equipment products with audio system design
DocsToAudio
roomtreatment.diy