Read Aloud PDF

Read Aloud PDF

Transform your PDF documents into immersive reading experiences. Whether you're studying research papers, reading reports, or reviewing manuscripts, Readio lets you listen to PDF files with natural AI voices while following along with synchronized highlighting and auto-scrolling.

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Natural AI voices

Listen to your PDFs with natural-sounding voices that make long documents easier to get through.

  • A wide range of voices across major languages
  • Multilingual voices for mixed-language PDFs
  • Switch voices and adjust speed anytime
Alloy HD
balanced, neutral, versatile
Echo HD
clear, steady, straightforward
Onyx HD
deep, strong, resonant
Nova HD
bright, friendly, approachable
Shimmer HD
light, crisp, expressive

Text Highlight

Follow along as it reads.

  • Sentences highlight in real time while the page automatically scrolls to the current text.
  • Perfect for deep reading, proofreading, and long documents.

Reading and listening simultaneously creates a powerful learning experience that enhances comprehension and retention.

Our synchronized highlighting keeps your eyes on the text while your ears take in the information.

Smart Speed Control

Find your perfect listening pace with precision control.

  • Choose from convenient presets (0.75x, 1.5x, 2.5x) or fine-tune to your exact preference.
  • Speed up to power through documents or slow down to grasp complex concepts.

Playback Speed

1x

Cloud Library Sync

Your reading progress travels with you.

  • Auto-syncs across all your devices—start on your laptop, finish on your phone.
  • Visual progress indicators for every PDF and EPUB in your personal library.
Library Sync
Syncing...
Research_Paper_final.pdf
PDF • Just now
78%
The Great Gatsby.epub
EPUB • 2m ago
42%
Lecture_Notes_W4.pdf
PDF • 1h ago
12%

Multiple File Formats

Not just PDFs.

  • Readio supports PDF, EPUB, DOCX, TXT, and more—so you can listen to documents, ebooks, and drafts in one place.
  • Great for turning reading time into listening time—anywhere.
PDF
Portable Document
EPUB
E-Book Format
DOCX
Word Document
TXT
Plain Text
HTML
Web Page
URL
Web Link
ODT
Open Document
RTF
Rich Text

How to Read Your PDF Aloud

Getting started is simple. Upload your document and let AI voices bring your content to life.

Step 1

Upload Your PDF

Drag and drop any PDF file into Readio. Supports all document types from textbooks to business reports.

Step 2

Select Voice

Choose from natural-sounding AI voices and customize read aloud speed, language, and preferences.

Step 3

Listen

Start reading aloud with synchronized highlighting. Navigate chapters, adjust zoom, and control playback easily.

Who uses Readio

Listen to PDFs so you can learn, review, and stay focused without staring at the screen.

Students

Students

Listen to lecture notes and textbooks while commuting, walking, or preparing for exams.

Researchers

Researchers

Review papers by listening while following the highlighted text. This helps with literature review and long reading sessions.

Professionals

Professionals

Listen to reports, proposals, and manuals during busy workdays. Stay productive when you cannot sit and read.

Proofreading

Proofreading

Hear your writing out loud to catch awkward phrasing and small mistakes. A fast way to improve clarity.

Accessibility

Accessibility

Reduce eye strain and make long documents easier to consume. Adjust the speed and listen at your own pace.

Frequently asked questions

Yes. You can read PDFs aloud directly in your browser with Readio — no installation required. Free usage comes with limits, but you can start listening right away. If you need higher limits or MP3 export, you can upgrade anytime.
Upload your PDF (drag & drop works), choose a voice and adjust the speed, then press play to listen — text highlighting helps you follow along, and you can pause, resume, or jump to any section anytime.
Yes. Readio works on modern mobile browsers, so you can listen to PDFs on iPhone, iPad, Android phones, and tablets without downloading an app. For the best experience, use Chrome or Safari and keep the page open while audio plays.
Yes — MP3 download is available for paid users. Free users can listen to PDFs online, and upgrading unlocks MP3 export to download PDF audio for offline listening and reuse.
Not yet. Readio currently works best with text-based PDFs. If your PDF is scanned or image-only, you’ll need to OCR it first. We’re actively working on scanned PDF support.
Readio supports most major languages and a wide range of natural-sounding voices. We also provide multilingual voices, which are useful if your document contains mixed languages.
We take privacy seriously. Your PDF is processed to provide read-aloud playback and is not publicly shared. If you’re working with sensitive documents, avoid uploading personal confidential data and check our Privacy Policy for details.

Ready to start?

Start listening in seconds.

Upload your PDF and start reading aloud right away.

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