To hear a paragraph now, open the essay reader, paste up to 3,000 characters, choose an available Device voice and press Play. Device voices need no CastReader account. Keep your original draft open beside the reader so you can make changes in the document you will submit.
Listening gives you another way to review familiar sentences. A repeated word may become easier to notice; a transition may sound abrupt. It does not guarantee an error-free essay, and it does not replace checking your argument, sources or formatting. The UNC Writing Center’s editing and proofreading guide includes reading aloud among its proofreading strategies and distinguishes sentence-level checks from larger revisions.
We make CastReader. The workflow below explains its current reading routes, rather than claiming that a voice can automatically correct your writing.
Choose the route that matches your draft
| Your draft is… | Start here | What happens |
|---|---|---|
| A paragraph you can copy | Paste and listen | Reads the text you paste; it does not open another tab or edit the original |
| A Word document or text PDF | Open the document reader | Opens a supported file for reading; check the extracted text before listening |
| In Google Docs | Google Docs reading setup | Explains the supported browser-extension route; a short copied passage also works in the paste reader |
| On another supported webpage | Get the browser extension | Provides installation choices for reading supported pages in place |
The paste reader is a web tool, not an extension installer. You do not need to install an extension just to hear a copied paragraph. For an image-only PDF, obtain a text version or run OCR first; a document containing pictures of words is different from one containing selectable text. Complex columns, footnotes and tables also deserve a quick reading-order check.
A proofreading pass you can repeat
1. Choose one section. Copy a manageable passage into Read This to Me. Its limit is 3,000 characters, not 3,000 words. For a longer essay, work section by section or use the document route above.
2. Choose the voice deliberately. Select a voice from the Device group for listening without an account. The available voices depend on your browser and operating system. CastReader AI voices are a separate option: they require sign-in, and the Free plan includes 20 AI listening minutes per day. See current plan limits before choosing a cloud voice. Selecting a local device voice keeps speech generation on your device; selecting cloud AI sends the reading text for speech generation.
3. Start near your normal reading speed. Try 1× and adjust for clarity. Keep the draft visible, with a place to note issues. The goal is to hear the words that are present, not to finish the essay as quickly as possible.
4. Pause and edit the original. When something sounds wrong, pause playback and find the sentence in your source document. Correct it there. A change in Google Docs or Word does not update a passage already pasted into the reader.
5. Replace the copied passage and listen again. After editing, paste the revised section and replay it. Then check the final document visually, including quotations, citations, punctuation and layout. Speech may pronounce different spellings alike or omit details you need to inspect on the page.
What to listen for — and what still needs your eyes
Consider this deliberately flawed example:
The results show that the the second group improved. This proves the policy works for everyone.
There are two different checks here. The repeated “the” is a proofreading issue that you may hear. The leap from one group’s results to “everyone” is an argument issue: you still need to examine the evidence. TTS can read an unsupported claim fluently; it cannot make that claim sound logically valid or invalid for you.
During a listening pass, focus on one question at a time:
- Missing or repeated words: compare what you hear with the intended sentence.
- Sentence boundaries: if several ideas blur together, inspect the punctuation and decide whether to split the sentence.
- Transitions: after a paragraph ends, ask how the next one follows from it.
- Unclear references: when you hear “this,” “they” or “it,” check that the referent is clear.
Then do a separate visual check for names, dates, formulas, citations and formatting. A synthetic voice can mispronounce a technical term even when you spelled it correctly. Conversely, it may pronounce “their” and “there” identically even when you chose the wrong one. Treat unusual audio as a reason to inspect the text, not an instruction to change it automatically.
If the reader starts in the wrong place or skips text
For a pasted passage, check exactly what is in the input box and start a new playback from that passage. For a file, inspect the text the reader extracted; two-column papers and footnotes can arrive in an unexpected order. Copy the relevant paragraph into the text reader if you need a simpler proofreading pass.
For Google Docs, use the specific setup guide. If it does not read correctly, follow the Google Docs troubleshooting steps rather than assuming every web editor behaves the same way.
If selecting a voice opens a sign-in prompt, check whether you selected CastReader AI instead of a Device voice. The paste reader plays speech; it does not create a downloadable MP3 or WAV file.
Keep the final check in the document you will submit
After listening, save the revised source and review its exported or submitted version. A clean listening pass does not verify page numbers, a bibliography or the file attached to an assignment.
For the reading side of coursework, compare student TTS tools and their limits. To start this editing pass now, paste your first paragraph into the reader.
Reading routes and voice limits checked October 17, 2026.
