On a computer, eligible Google Workspace or Google AI plans offer Tools → Audio → Listen to this tab. If that option is unavailable, CastReader is a desktop-browser alternative for listening to accessible document text with paragraph highlighting while proofreading.
Google’s audio feature and eligibility
This proposal outlines our plan to integrate artificial intelligence capabilities into the existing workflow management system. The implementation will proceed in three phases over the next six months.
Phase one focuses on natural language processing for automated task categorization. By analyzing task descriptions, the system will automatically assign priority levels and route items to appropriate team members.
Reads Google Docs aloud — word-by-word highlighting follows along
Choose a reading workflow that fits your account, document, and privacy requirements
Browser Extension
Open a Google Doc you can access in Chrome or Edge and start CastReader. Available text depends on document loading, permissions, and the current document view.
Voice Choice
Choose from the current voice catalog. Premium voices and higher allowances require Pro; voice preference is not a verified comparison against Google’s audio feature.
Follow Along
In supported document views, CastReader highlights the current paragraph and follows playback with scrolling. Complex layouts and unloaded paragraphs can affect positioning.
Free to Start
Standard read-aloud currently includes 20 free minutes per day. Higher allowances, premium voices, and speeds above 1.25× require account-linked Pro; see Pricing for current limits.
Everything you need to know about listening to content with CastReader
First check for Tools → Audio → Listen to this tab on a computer; this requires an eligible Google Workspace or Google AI plan. Alternatively, install CastReader in Chrome or Edge, reopen the document, and start playback.
Yes. Eligible plans include document audio; availability is not universal across accounts, devices, and languages. A missing menu does not mean your document is broken. Check Google’s official audio instructions. Accessibility support for an external screen reader is a separate route.
Docs compatibility does not establish Slides or Sheets support: those applications use different page structures. Check whether your intended text is accessible rather than assuming complete slide-deck or spreadsheet reading.
Standard read-aloud currently includes 20 free minutes per day, not unlimited listening. Premium voices, higher allowances, and speeds above 1.25× require account-linked Pro. See current plans.
AI read-aloud sends the text needed to generate audio to cloud services, including text prefetched for upcoming audio. It is not fully local processing. AI Explain also uses cloud processing. Check your organization’s data policy before using confidential documents.
Supported document views show paragraph highlighting and follow playback with scrolling. Complex layouts, unloaded content, or edits can affect positioning; verify a short passage first.
You must already have access to the document. Sharing permissions, managed-browser policies, and document loading can still restrict extraction. CastReader does not bypass access controls.
Choose a matching language and voice from the current player catalog. Availability, pronunciation, and highlighting quality vary by language; test a short passage when the document mixes languages.
Google Docs now offers document audio on eligible Google Workspace and Google AI plans. On a computer, look under Tools, then Audio, for Listen to this tab. Check Google’s current eligibility guidance if the option is missing; an unavailable account feature is different from failed playback.
Screen-reader support is a separate accessibility workflow. Enable the appropriate Docs accessibility settings and use the navigation commands for your chosen screen reader. It is useful for readers who already rely on assistive technology, not a prerequisite for the eligible-plan audio feature.
Browser article readers and document-aware extensions are another category. A Docs editor is not an ordinary HTML article; its rendering and loading behavior can affect text extraction. Reading only the toolbar or stopping early is a symptom to investigate, not proof that every reader fails for the same reason.
With CastReader on desktop Chrome or Edge, open a document you can access and start with a short passage. The Docs-specific extraction path supports paragraph highlighting where document text and positions are available. Standard reading currently includes 20 free minutes a day; Pro enables higher allowances, premium voices, and speeds above 1.25× up to 3×.
For proofreading, listen back to a paragraph while checking the written draft for missing words, repeated phrases, and awkward sentences. Compare the spoken text with the document before relying on narration for a complete review.
Long documents, tables, comments, suggestions, and embedded views need their own checks. Wait for the relevant content to load and verify a passage near the end. Do not assume that every off-screen paragraph or comment has been extracted.
AI voice generation sends the necessary text to cloud services and may prefetch upcoming passages. For confidential work, confirm that cloud processing and browser extensions are allowed by your organization. Docs support does not automatically establish the same behavior in Slides or Sheets.
Hard numbers — not vibes — from authoritative sources
$2.22 billion
US audiobook sales in 2024, up 13% year-over-year (Publishers Weekly / Audio Publishers Association)
Source →51%
of US adults have listened to an audiobook in 2025 — roughly 134 million people (APA Consumer Survey 2025)
Source →2.2 billion
people globally with near- or far-vision impairment (WHO Fact Sheet, 2024). TTS is the primary access path for digital reading content.
Source →78%
of audiobook listeners multitask while listening — commute, chores, exercise (Audiolibrix Great Audiobook Survey, 2024)
Source →27.2 minutes
average single-trip US commute in 2024, up from 26.8 (US Census ACS via Statista). That's nearly an hour each day of audio-only time.
Source →effect size 0.35
measured comprehension lift from TTS for reading-disabled students across 22 studies (Wood, Moxley, Tighe & Wagner, Journal of Learning Disabilities, 2018)
Source →15.5 million
US adults with ADHD per CDC 2024 — about half diagnosed in adulthood (CDC MMWR, October 2024)
Source →Every Chrome Web Store review below is verifiable at the link in each card. We don't hide negative feedback — we answer it within 24 hours.
“This is 1 of the best TTS and its smooth. If this is truly free i'll keep this 100%. Every other TTS says its free but has a secret. They interrupt or they just say better ai voices pay. But i like this voice. I've tried loads and this is 1 of the best ones that actually says free.”
“Works perfectly on vivaldi. One suggestion though. I wish it had a play button appear next to a paragraph when we hover over it. Just like in the case of speechify.”
“Extremely user friendly short keys. Placed forward backward and speed up down as Natural as it could be. Voices are great and smooth. I would recommend it over many hyped products.”
“At the very least it's better than many paid TTS models. Still not as good as ElevenReader or LAP, but maybe the best free model for TTS.”
“So glad I can finally switch voices! The default was fine but I found one I actually enjoy listening to for hours. Small thing, huge difference.”
“Best one i found, user friendly, and great voice over.”
“ChatGPT's long answers are finally listenable. Let it generate while I listen — doubles my productivity. Love the inline button next to each response.”
“I tried using this add-on to listen to an ebook on the O'Reilly learning platform, and it works smoothly. However, it always restarts from the first paragraph whenever I scroll or select a different paragraph. Please consider adding a bookmark or checkpoint feature so users can mark where the reading should begin.”
↪ Founder reply
Replied by CastReader founder Yan Xu within 48 hours: acknowledged the issue, shipped a bookmark feature in the following release. Reviewer's verbatim feedback drove the v1.2 roadmap.
“Need to highlight text and select it.”
“Hard to select text.”
↪ Founder reply
Replied by CastReader founder Yan Xu within 24 hours: apologized, asked which site/browser the issue occurred on, provided a workaround using the keyboard shortcut, and offered direct support at support@castreader.ai.
We re-test, re-write, and ship continuously. Every entry has a real date.
Rewrote landing pages with verbatim Chrome Web Store testimonials, real audiobook market data, and tested-12-extensions methodology. Every claim now has a sourceable link.
CastReader provides native apps for iPhone and Android; Android downloads are available directly from Google Play.
Wrote up the OCR pipeline: how CastReader handles Amazon's 184 random font alphabets and 361 unique glyphs per Kindle book. Shared in dev.to.
The phone app flow now has its own landing page for bookshelf sync, Read Aloud, synced highlighting, auto-scroll, background playback, and resume progress.
Ranked #10 in Daily, 99 upvotes, 4 community comments shaped the v1.2 roadmap.
Switched from older TTS engines to Kokoro neural voices. User reviews shifted from 'usable but robotic' to 'enjoy listening for hours' (verbatim from review by patrick chiang).
OCR success rate improved from 78% to 89% on English-language Kindle books. Multi-column page detection added for academic PDFs.
I built CastReader because I owned hundreds of Kindle books and couldn't listen to them on my morning runs without buying separate Audible copies. The technical problem — Amazon's Cloud Reader font encryption — turned out to be solvable with OCR. The product problem — making it actually pleasant across phones, desktops, and 9 supported languages — took two years of iteration. We're a small team. I answer every Chrome Web Store review personally (see testimonials above — including the 3-star and 1-star ones). If something's broken or missing, email support@castreader.ai.
— Yan Xu, founder
Last reviewed: · CastReader Team — reviewed against 2025 testing data
Install the extension and verify a short passage. Standard reading has a daily free allowance; AI voices use cloud processing.
For local PDF, DOCX, TXT, Markdown, and images, plus supported webpages and browser-based readers. Local EPUB import is not available.
For DRM-free EPUBs and mobile reading on iPhone, iPad, and Android.
Official App Store and Google Play downloads · Chrome, Edge, and Firefox extensions