Convert PDF, EPUB, DOCX and TXT files to MP3 or M4B audio online
Play any sound backwards online for free
Stage
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Founded
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Based in
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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
Upload audio files to reverse
Extract and reverse audio from video files
Record audio directly in browser
Compare original and reversed audio
Download as MP3 or WAV file
Reverse singing mode
No account required
Process files on device only
Support for MP4, MOV, WebM video formats
MP3 compression option or WAV lossless format
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
No sign-up or account needed to use
Reverse singing mode lets you record your attempt and hear it flipped back
Compare original and reversed side-by-side with dual players
Extract audio from short videos without reversing or exporting the video itself
DocsToAudio
Reverse Audio