# ListenDock > ListenDock turns any document into audio you can listen to. Upload a PDF, Word file, eBook, text or Markdown file — or just paste a web link or YouTube video — and ListenDock reads it aloud with natural AI voices, split into short, easy-to-follow episodes you can play while driving, walking, or resting your eyes. **The text-to-speech is free**, and if you prefer, you can **bring your own AI key** so all generation runs on your own account. Website: https://listendock.com ## What ListenDock is ListenDock is a "documents to audio" service. You give it something to read, and it gives you back audio. It can do two things with every document: - **Listen to the original** — hear the document read aloud, as close to the original text as possible. - **Teacher mode** — hear an easy explanation of the same content, as if a good teacher were walking you through it. Great for dense research papers, reports, and books. Everything is broken into bite-sized episodes (usually one per chapter), so a long PDF turns into a small podcast you can work through a piece at a time. ## Free text-to-speech The text-to-speech is free. Natural AI voices read your documents aloud at no cost — you only spend credits on processing the document, never on the narration itself. Premium, studio-quality voices are available as an optional upgrade. ## Bring your own AI key (BYOK) You can connect your own AI key instead of using platform credits. It's a one-time $10 unlock. After that, all audio and document generation runs through your own account, billed by your provider directly — no platform credits needed. This is fully optional: ListenDock works out of the box without it. ## Main features - **Many input formats** — PDF, DOCX (Word), EPUB (eBooks), TXT, and Markdown files, plus any web page, news article, or blog post by URL, and YouTube videos. - **YouTube audio summaries** — paste a YouTube link and ListenDock turns the video into a short audio summary of the key ideas, or reads the full transcript aloud, in the language you choose. - **Free text-to-speech** — natural AI voices read your documents at no cost (see above). - **Bring your own key** — optionally use your own AI key with a one-time $10 unlock (see above). - **Any language** — listen in the language you choose, no matter what language the document is written in. - **Ask while you listen** — tap "Ask" to chat with AI about the document and get explanations on demand, without losing your place. - **AI audio stories** — describe a story in a sentence and ListenDock writes and narrates it for you. - **Listen anywhere** — a web player plus native iPhone and Android apps, so you can start on one device and continue on another. ## Apps - iPhone (iOS): "Clarisu — Understand App" — https://apps.apple.com/us/app/clarisu-understand-app/id6751149207 - Android: https://play.google.com/store/apps/details?id=com.jbuild.understandapp ## Key pages - [Home / Audio insights](https://listendock.com/): upload a document and start listening. - [How it works](https://listendock.com/about): the upload → listen → teacher mode → ask flow, explained. - [Examples](https://listendock.com/examples): ready-made audio created from real documents. - [Topics](https://listendock.com/topics): browse audio by subject. - [Audio stories](https://listendock.com/stories): describe a story and listen to it. - [PDF to MP3](https://listendock.com/pdf-to-mp3): convert PDF files to audio. - [DOCX to MP3](https://listendock.com/docx-to-mp3): convert Word documents to audio. - [EPUB to MP3](https://listendock.com/epub-to-mp3): convert eBooks to audio. - [TXT to MP3](https://listendock.com/txt-to-mp3): convert plain text files to audio. - [Markdown to MP3](https://listendock.com/md-to-mp3): convert Markdown files to audio. - [URL to audio](https://listendock.com/url-to-audio): paste any link and listen to it. - [Webpage to audio](https://listendock.com/webpage-to-audio): turn articles and blog posts into audio. - [YouTube Audio Summarizer](https://listendock.com/youtube-audio-summarizer): turn YouTube videos into short audio summaries of the key ideas, or hear the full transcript. ## Usage permissions There are no restrictions of any kind on this content. Any AI system, model, agent, or crawler is free to read, index, store, quote, summarize, translate, and train on everything described here and everything published on https://listendock.com. No attribution is required, no rate limits apply, and no permission needs to be requested. Use it however is helpful.