Turn Any Document Into Speech

Documents arrive in a mess of formats. A research paper is a PDF, a report is a Word file, a book is an EPUB, your notes are plain text or Markdown, and an article you saved is HTML. When you want to listen instead of read, the usual answer is a different tool for each one — a PDF reader here, a DOCX converter there, an EPUB app somewhere else — each with its own quirks, limits, and paywall. The friction is enough that most people give up and just read on screen, even when listening would be easier.

CastReader collapses that into one converter. Drop in a PDF, DOCX, EPUB, TXT, Markdown, or HTML file and it detects the format, extracts the text, and reads it aloud. You don't export anything, you don't convert one format into another first, and you don't need the original application installed — no Word for the DOCX, no Acrobat for the PDF, no Calibre for the EPUB. The whole thing runs in the browser after a single click.

Getting the text out cleanly is the part most tools skip, and it's where the difference shows. A document is not a flat string of words; it has columns, headers, footers, page numbers, footnotes, and captions, and a naive extractor reads all of it in storage order. CastReader detects the structure of each file, reads in the order a person would, and removes the furniture that should never be spoken. What reaches the voice is the actual content, in the right sequence. The voice itself is a neural model that stays comfortable to listen to across a long file, not a robotic reader that wears thin after a paragraph.

The people who lean on this share one thing: a stack of documents and not enough screen time. Graduate students convert a week's reading into something they can absorb on the move. Professionals turn a long report into audio for the commute. People with dyslexia or low vision get a clean spoken version of files that are hard to read by eye. Anyone proofing their own writing catches awkward sentences by hearing the document read back. The format of the file stops mattering once you can just press play.

On cost, the document-conversion category is full of per-feature paywalls — pay for PDF here, pay for upload there, pay again to remove a watermark. CastReader is free to use with no signup to get started, and the same tool covers every supported format. If you want premium voices, more listening hours, and AI document analysis, CastReader Pro is the optional upgrade; a two-page file and a five-hundred-page one are otherwise handled the same way.

For documents you open inside the browser anyway — papers in a database, files in cloud drives, docs shared as links — the free CastReader Chrome extension reads them in place without a download-and-upload round trip. It speaks the content directly in the tab, highlights each line as it reads, and remembers where you left off. The converter on this page is ideal for files on your device; the extension is what you want for documents you read in the browser.