Convert Any PDF to Audiobook — Free

Yes. Upload any PDF — textbooks, research papers, reports, novels, manuals — and CastReader converts it to natural AI audio for free. No signup, no page limit, no daily cap. Other tools like NaturalReader ($60/yr) and Speechify ($139/yr) charge for this feature.

Yes. CastReader's PDF pipeline detects multi-column layouts and reads text in the correct order (left column first, then right). It also filters out headers, footers, page numbers, figure captions, and table labels so the narrator reads only the actual content.

CastReader runs OCR on scanned PDFs to extract text from page images. Results are best with clear, high-resolution scans. Handwritten documents and very old/degraded scans may have limited accuracy. For best results, use PDFs with selectable text.

Yes. After your PDF is processed, each chapter becomes a separate audio track. You can play them in the browser or download as MP3 files for offline listening on your phone, car, or any audio player.

Most PDFs process in under 30 seconds. A 500-page textbook might take a minute or two. You'll see a progress indicator, and the reader opens automatically when processing is complete.

Significantly. Adobe's built-in 'Read Aloud' uses old system voices (robotic and unnatural), can't handle multi-column layouts, and reads page numbers and headers aloud. CastReader uses neural AI voices, detects layout structure, filters noise, and lets you download the audio as MP3.

NaturalReader charges $60/year for PDF upload. Speechify charges $139/year. CastReader is free. Voice quality is comparable — all three use neural AI voices. CastReader's additional advantage: the free Chrome extension reads PDFs directly in your browser tab without downloading, and works on sites that block other tools.

Absolutely. Upload a PDF in your target language — French, Japanese, Spanish, Arabic, or 40+ others. CastReader auto-detects the language and uses a native AI voice. Read along in the PDF while listening for pronunciation and comprehension practice.

Yes. Your PDF is processed on our servers for text extraction and audio generation, then available only to you. We don't share, sell, or use your documents for training. No account required means no tracking.

Up to 100MB. For very long PDFs, the system processes them chapter by chapter. Each chapter becomes a separate audio track you can play or download independently.

Yes — install the free CastReader Chrome extension. It reads PDFs open in your browser tab directly, with paragraph highlighting and speed control. No downloading, no uploading. Perfect for academic databases, arXiv, government sites, and any PDF you view in Chrome.

If you can open and view the PDF (i.e., you know the password), the text extraction will work after you unlock it. Fully encrypted PDFs that you cannot open are not supported — you need access to the content for any converter to work.