Free Online AI Reader for PDF & EPUB

Quickly turn your PDF or EPUB files into high-quality audio. Upload a document and start listening with our AI-powered online audio reader.

Welcome to Readio

Sign in to unlock the power of audio reading and manage your files seamlessly.

How to Use the Audio Reader

Start listening to your documents in minutes with our simple steps

Upload File

Choose a PDF or EPUB file (up to 50MB) to get started. You'll be redirected to the online reader.

Wait for Processing

We'll quickly convert your document into an audio-friendly format. A short wait and you’re ready to go.

Pick a Voice

Select from 300+ AI voices across multiple languages. Preview and choose the one you like best.

Listen Aloud

Click play to hear your document read aloud. Adjust voice, speed, and settings for a personalized audio reading experience.

Free Features

Smart Navigation

Use the table of contents to jump between sections or chapters with ease.

Hands-Free Listening

Our auto-scroll feature works seamlessly with the AI voice reader—perfect for immersive listening.

AI Voice Library

Access over 300 realistic AI voices, ideal for reading both PDF and EPUB files aloud.

Text Highlighting

Follow along visually with synchronized word highlighting as the content is read aloud.

Download as MP3

Turn your documents into downloadable MP3 files for offline listening. Works with PDFs and EPUBs.

Adjust Speed & Voice

Speed up or slow down the audio to match your preference. Great for active learning or relaxed listening.

Premium Benefits

Upgrade your audio reading experience with enhanced features tailored for frequent users.

Upload Larger Files

Support for bigger documents beyond 50MB—perfect for lengthy PDFs and detailed EPUBs.

Cloud Sync & Storage

Save files in the cloud and keep your reading progress synced across all devices.

Enhanced Reading Layout

Enjoy a clean, reader-optimized view that makes long-form listening more enjoyable.

Premium Voice Collection

Access 30+ expressive AI voices for a more engaging and lifelike narration.

Personal Podcast Feed

Receive your audio files as a private podcast feed—stream documents on your favorite podcast app anytime.

Frequently Asked Questions

Using Our PDF & EPUB Audio Reader

Absolutely. Enjoy core features like file uploads, AI voice playback, and highlighting without cost. Free users can read up to 20,000 characters monthly.