Free Try
Klassifier · Product

Turn your book into an audiobook

Upload an EPUB, PDF, DOCX or TXT file, pick a narrator and get a finished audiobook: an MP3 for every chapter and one M4B file with chapter markers. Characters can speak in their own voices, and the book can be translated first.

Free Try Explore the details
Turn your book into an audiobook

From book to audiobook in one step

Klassifier reads your book the way a narrator would. It finds the chapters, voices every one of them with natural AI voices, and packs the result into files you can publish or listen to right away.

Use it for your own novels, non-fiction, course material, reports or public-domain classics, in any of the languages our voices speak.

Create an audiobook

Features

Choose your narrator

Pick any voice in the language of the book: our studio voices, voices from our voice actors, or your own cloned voice.

Voices for characters

Turn it on and dialogue is spoken by the characters themselves: each one gets a voice that fits their gender and keeps it for the whole book, while the narrator reads the rest.

Translate while you voice

Have the book translated into the narration language first, as a literary translation that keeps names and meaning, then voiced.

Chapters found for you

EPUB books keep their own chapters. In PDF, DOCX and text files, headings such as "Chapter 3" start a new chapter; text without headings is split into parts.

How to create an audiobook

  1. Sign in to the Klassifier app, or create a free account: sign up
  2. Open the Audiobook page: app.klassifier.com/audiobook
  3. Upload your book (EPUB, PDF, DOCX or TXT, up to 100 MB) or paste its text, and give it a title.
  4. Choose the language and the narrator voice. Both lists are searchable. Turn on character voices or translation if you want them.
  5. Press Prepare chapters. You see every chapter, the length of the audio and the estimated cost before anything is voiced.
  6. Press Create audiobook. Chapters are voiced one after another while you follow the progress; download the files when it finishes.

You can close the page while your audiobook is being made. If it stops for any reason, press Resume: it continues from the first chapter that is not finished yet.

What you get

  • One M4B audiobook with chapter markers, ready for Apple Books and audiobook players.
  • An MP3 file for every chapter, one by one or all together in a ZIP file.
  • Each chapter starts with its title read aloud, with natural pauses between paragraphs and chapters.
  • Your files stay in your account until you delete them.

Pricing

Audiobooks use your Klassifier credit like text to speech: you pay for the length of the finished audio. The estimate is shown before you start; a typical novel of 80,000 words is about 9 hours of audio.

You need some credit to start. See the plans on our pricing page

Frequently asked questions

Which files can I upload?

EPUB, PDF, DOCX and TXT files up to 100 MB, or text you paste in. A book can have up to 2 million characters.

How long can a book be?

Up to 2 million characters, which is longer than most novels. Longer works can be split into volumes.

Can I use a scanned PDF?

No. A scanned PDF is a set of images with no text to read. Use a PDF with selectable text, or the EPUB or DOCX version of the book.

How are character voices chosen?

Each speaking character is given a voice that matches their gender from the voices of the chosen language. A character keeps the same voice for the whole book; characters whose gender is unclear are read by the narrator.

Can I publish the audiobook?

Yes, if you own the rights to the book or it is in the public domain. You are responsible for having the rights to turn the text into an audiobook.

How long does it take?

Usually much less than the length of the audio. A long novel can take an hour or more; you can follow every chapter as it is finished.

Questions about a project? Write to us: hello@klassifier.com

Create an audiobook
Your next steps

From an idea to your workflow

  1. 01

    Define

    Choose the product or service that fits your task.

  2. 02

    Prepare

    Gather representative content and define your requirements.

  3. 03

    Review

    Evaluate the available outputs against your own examples.

  4. 04

    Connect

    Confirm access and integration options with our team.

For developers & teams

Make it part of your product.

Discuss supported inputs, deployment needs, and integration options for this product or service.

Discuss your project
INTEGRATION CHECKLIST
  • Input formats and language requirements
  • Output structure and review criteria
  • Authentication, access, and deployment

Request the current documentation from our team before implementing an integration.

Turn your book into an audiobook

Ready for the next step?

Explore the application or discuss a solution for your team.

Free Try Discuss your project