Open any PDF in your browser and listen to it with natural AI voices. CastReader reads PDFs aloud with paragraph highlighting.
Turn any PDF into an audiobook experience
Open any PDF in Chrome or Edge, click the CastReader icon, and it reads the document aloud. Works with text-based PDFs of any length.
CastReader 支持 28 种语言。提取 PDF 正文后，可选择当前可用的 AI 或设备音色，先试听，再开始长文朗读。
The current paragraph is highlighted as it reads. Click any paragraph to jump there. Never lose your place.
Free to use with no signup. Listen to your PDFs right away. Upgrade to CastReader Pro for premium voices, more listening hours, and AI document analysis.
Everything you need to know about listening to content with CastReader
Open the PDF in Chrome or Edge (drag it into the browser or use File > Open), then click the CastReader icon. It reads the PDF aloud.
CastReader works with text-based PDFs. Scanned PDFs (images of text) are not supported — the PDF needs to contain selectable text.
Free to use, no account needed. There's also an optional CastReader Pro plan with premium voices, more listening hours, and AI document analysis.
Yes. Use the floating player to control speed.
Yes. Paragraph-level highlighting with auto-scroll.
CastReader 支持 28 种语言。各语言在不同客户端上的可用音色和功能有所差异，请以当前音色选择器为准。英语和普通话为 GA，其他语言仍为 Beta/Lab。
Yes. CastReader is available on both Chrome and Edge.
Yes. CastReader handles PDFs of any length, reading them section by section with continuous playback.
CastReader 已适配并上线 iPad 和安卓平板，大屏布局让原文、朗读与解读更清楚。
Mac 首页截图展示为英文界面。
硬数据 —— 不是 vibe —— 来自权威来源
effect size 0.35
22 篇研究的 meta 分析显示 TTS 对阅读障碍学生的理解力提升幅度（Wood, Moxley, Tighe & Wagner, Journal of Learning Disabilities, 2018）
Source →下方每一条 Chrome Web Store 评论都可以在卡片链接处验证。我们不藏负面反馈 —— 我们 24 小时内回复。
“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
CastReader 创始人 Yan Xu 48 小时内回复：承认问题，下个版本上线了 bookmark 功能。这条评论的反馈直接推动了 v1.2 路线图。
“Need to highlight text and select it.”
“Hard to select text.”
↪ Founder reply
CastReader 创始人 Yan Xu 24 小时内回复：道歉、询问发生的网站/浏览器、提供键盘快捷键作为绕过方案、留下 support@castreader.ai 直接支持邮箱。
我们持续测试、改写、上线。每条更新都带真实日期。
用 verbatim Chrome Web Store testimonial、真实有声书市场数据、12 工具实测的 methodology 重写落地页。每条主张都有来源链接。
CastReader 已提供原生 iPhone 和 Android App；Android 版可直接从 Google Play 下载。
写了 OCR 管线的深度文章：CastReader 如何处理 Amazon 每本 Kindle 书 184 套随机字母表和 361 个独特 glyph。发表在 dev.to。
手机 App 的书架同步、Read Aloud、同步高亮、自动滚动、后台播放和进度续听，已经拆到独立落地页。
Daily 榜 #10，99 upvotes，4 条社区评论推动了 v1.2 路线图。
从旧 TTS 引擎切换到 Kokoro 神经网络语音。用户评论从 'usable but robotic' 转为 'enjoy listening for hours'（来自 patrick chiang 的 Chrome Web Store 评论原话）。
英文 Kindle 书的 OCR 成功率从 78% 提升到 89%。加入了多栏页面检测（学术 PDF 适用）。
我做 CastReader 是因为我有几百本 Kindle 书，想在晨跑时听它们，但不想为每本再买 Audible 版。技术问题 —— Amazon Cloud Reader 的字体加密 —— 最后用 OCR 解决了。产品问题 —— 让它在不同设备和语言上真正好用 —— 花了两年迭代。我们是个小团队。我亲自回复每一条 Chrome Web Store 评论（上方 testimonials 里有证明 —— 包括 3 星和 1 星的）。如果有什么坏了或缺失，邮件 support@castreader.ai。
—— Yan Xu, 创始人
最近审阅: · CastReader 团队 —— 基于 2025 测试数据
在你喜欢的屏幕上，继续阅读。
在支持的网页中，直接听文章、Kindle 书籍和 AI 回答。
在 Safari 开始第一次朗读iPhone、iPad、Android 手机与平板
了解手机与平板 AppCastReader Mac 版已上架 App Store，支持 macOS 14.6 及以上系统。Safari 浏览器扩展有独立的下载入口。 CastReader Windows 版已上架 Microsoft Store。
现已上线 · macOS 14.6+
现已上线
粘贴文字即可在浏览器里听读，无需安装。
开始在线朗读
