Listen to Kindle Books on Chrome
The only browser extension that reads Kindle Cloud Reader books aloud. Other TTS tools fail because Amazon uses custom font rendering — CastReader decodes it.
Why CastReader is the Only TTS That Works on Kindle
Amazon's custom font rendering breaks every other extension
The Problem
Why Other Extensions Fail
Kindle Cloud Reader uses custom font subsets where characters are scrambled. The letter 'A' might be stored as '∆' in the DOM. Every TTS extension reads gibberish — except CastReader.
The Solution
OCR + Glyph Decoding
CastReader intercepts Amazon's font data, decodes the glyph mappings back to real text, and uses OCR calibration to verify accuracy. All processing happens in your browser.
Follow Along
Paragraph Highlighting
Each paragraph is highlighted as it's read aloud. Click any paragraph to jump there. Auto-scrolls through the book as you listen.
100% Free
No Limits, No Account
Completely free. No signup, no subscription. The only TTS extension that works on Kindle Cloud Reader — and it costs nothing.
Frequently Asked Questions
Everything you need to know about listening to content with CastReader
Why don't other TTS extensions work on Kindle Cloud Reader?
Amazon uses custom font subsets as a DRM measure. The characters in the DOM are scrambled — they look correct when rendered with Amazon's font, but the underlying text is gibberish. Standard TTS extensions read this gibberish.
How does CastReader solve this?
CastReader intercepts Amazon's font data, decodes the glyph mappings back to real characters, and uses Tesseract OCR as calibration to verify the decoded text. The entire process happens locally in your browser.
Does this bypass Kindle's DRM?
No. CastReader reads the visually rendered text on your screen — the same content you can see. It doesn't download book files or circumvent any protection. It's functionally like a screen reader with better voices.
Which Kindle books does it work with?
Any book you can open on Kindle Cloud Reader (read.amazon.com). It works best with text-heavy books. Image-heavy pages (like illustrated books) may have occasional extraction hiccups.
Is it free?
Completely free with no limits. No account needed.
Does it work on Edge?
Yes. CastReader is available on both Chrome and Edge.
How do I use it?
Install CastReader, go to read.amazon.com, open a book, and click the CastReader icon. It starts reading aloud with paragraph highlighting.
What about the Kindle desktop app?
CastReader works with Kindle Cloud Reader in the browser (read.amazon.com), not the desktop Kindle app.
What languages does it support?
40+ languages with natural AI voices. Works with Kindle books in any language.
Is my reading data private?
CastReader processes text locally in your browser. Only the extracted text is sent to our voice API for audio generation. We don't track what books you read.
Start Listening Now
Completely free. No signup. No limits. Install and start listening.