Millions of books have never been recorded as audiobooks. Academic texts, self-published works, older nonfiction, foreign-language titles, and niche reference books often exist only as printed or digital text. If you want to listen to them, you have to create the audio yourself.

Text to speech technology makes that straightforward — and the results are better than most people expect.

Why Most Books Don’t Have Audiobook Versions

Publishers make audiobook production decisions based on expected demand. A title needs to sell enough copies to justify a recording studio, a narrator, and post-production. That rules out most academic publishing, many foreign-language titles, and anything with a specialized audience.

The result: roughly 500,000 audiobooks exist in English, while many millions of books are available only as text. If you’re a curious reader with varied interests, you’ll hit this wall regularly.

The Two Main Ways to Listen to Any Book

Option 1: Read the Digital Version with TTS

If you have an ebook — in PDF, EPUB, or another digital format — a text to speech app can convert it to audio directly. This is the smoothest workflow:

  1. Download the ebook in a supported format
  2. Import it into your TTS app
  3. Set your preferred voice and playback speed
  4. Start listening

The main variable is file format. Most TTS apps handle PDFs and EPUBs well. DRM-protected files from Amazon Kindle or Apple Books require using the TTS built into those platforms directly.

Option 2: Photograph Physical Pages

If you only have a physical copy, a text to speech app with OCR (optical character recognition) can read the photos. Photograph the pages, let the app recognize the text, and it converts everything to speech.

This takes more setup, but it works well. Quality depends on:

  • Image sharpness (flat pages, good lighting)
  • OCR accuracy of the app
  • Font complexity and page layout

For standard books with clean typography, accuracy is high. Dense textbooks with columns, footnotes, and diagrams take more attention.

Listening to PDFs: A Practical Guide

PDFs are the most common format for books without audiobook versions — academic papers, reports, whitepapers, and many self-published books come this way.

Text-Based vs. Image-Based PDFs

Not all PDFs are equal:

  • Text-based PDFs: The text is actual selectable text. TTS reads it accurately.
  • Image-based (scanned) PDFs: Each page is an image. TTS needs OCR to extract the text first.

A good text to speech app handles both automatically. When you import a scanned PDF, it runs OCR before reading — you shouldn’t have to do anything extra.

Handling Complex Layouts

Academic papers often use two-column layouts, footnotes, and equations. TTS reads these linearly — left to right, top to bottom — which can garble reading order in two-column formats. For technical papers, you may need to jump between sections manually or skip certain passages. For standard single-column books, the experience is clean.

Speed and Voice Settings

One advantage of TTS over recorded audiobooks is control. You can:

  • Increase speed — 1.5x to 2x for familiar material, 1x for dense content
  • Switch voices — pick a tone that matches the content
  • Pause and rewind easily — and your position is saved automatically

Research indicates most listeners can comprehend spoken content at up to 1.5–2x speed without significant accuracy loss, depending on familiarity with the subject matter.

Listening to Academic and Technical Books

For textbooks and dense nonfiction, a few strategies help:

Skip front matter. Prefaces, acknowledgments, and tables of contents don’t need to be listened to. Jump straight to Chapter 1.

Use chapter navigation. Good TTS apps let you jump between chapters. Use this to review sections and re-listen to anything that didn’t land the first time.

Combine listening with notes. Listening at 1x and pausing to jot a note often beats passive reading with no retention.

Don’t fight dense passages. Equations, legal boilerplate, and code listings are genuinely hard to absorb through audio. Skip or skim these sections and return to the text version when needed.

When a Physical Book Is Your Only Option

If you only have a physical copy:

  1. Photograph each page with your phone (even lighting and a flat page make a big difference)
  2. Import the images into your TTS app
  3. Let it OCR and queue the pages in order
  4. Listen

This workflow is slower to set up but practical for books you can’t find digitally. A 300-page book takes 10–15 minutes to photograph if you’re systematic. Alternatively, check whether a digital version is available through your library’s Libby or Overdrive app — many libraries offer free digital lending.

The Practical Upside

The books worth reading aren’t limited to the ones someone decided to record. Text to speech removes that bottleneck — any text becomes listenable, whether it’s a scanned PDF, a photocopied chapter, or an ebook from a small publisher. AI voice quality has improved to the point where long listening sessions are comfortable, and most listeners adapt to AI narration within a chapter or two.

Start Listening with Text to Speech

Text to Speech — AI Book Reader is built precisely for this use case. Import PDFs, photograph physical pages, or drop in an ebook — it converts any of it to clear, natural-sounding audio you can listen to on iPhone and iPad, at whatever speed works for you.