Text to speech for long documents on iPhone: Speak Screen vs a reader app
The iPhone has good text to speech built in, and plenty of people never need anything else. This guide looks at where it’s enough, and where a 300-page document starts to strain it.
What’s built into every iPhone
Under Settings → Accessibility → Spoken Content there are two switches:
- Speak Selection adds a Speak button when you highlight text. Good for a paragraph.
- Speak Screen reads the whole screen when you swipe down from the top with two fingers, with a small controller for pause, skip and speed.
The same settings let you download better voices, set a default speed and highlight each word as it’s spoken.
Where the built-in option is good
- It’s free and already there. Nothing to install or sign up for.
- It works in almost every app, including Mail, Safari, Notes, Books, Files and messaging apps. A reader app only reads what you import into it.
- It’s private. The speech is generated on the phone.
- It covers many languages, each with downloadable voices.
- It’s an accessibility tool first, and it works with the rest of iOS’s accessibility features.
For emails, web articles, a few pages of a PDF or anything you want read right now, use it. You don’t need an app for that.
Where it runs out on long documents
Speak Screen reads one screen at a time, and a long document is a lot of screens.
- It doesn’t remember your place. Stop, switch apps or come back tomorrow, and you find the spot yourself.
- It doesn’t know the structure, so you can’t jump to chapter seven.
- It reads everything visible. Page numbers, running headers, menu labels and captions all get spoken, again and again across a long PDF.
- Page turns depend on the app it’s reading from. Some carry on to the next page and others stop.
- There are no listening features like a sleep timer, per-book speed or a library.
What a reader app adds
A reader app treats the document as a book. You import the file once, and it:
- splits it into chapters or sections you can jump between,
- drops repeated headers, footers and page numbers before they’re spoken,
- remembers your place in each document,
- and gives you audiobook controls like a sleep timer, lock-screen playback and skip back.
The downside is that it only works on files you bring to it, and some apps like this upload your documents to a server to make the voice. Check before importing anything confidential.
Which to use
| What you’re listening to | Use |
|---|---|
| An email, a web page, a message | Speak Screen |
| A highlighted paragraph | Speak Selection |
| A 10-page PDF you’ll finish today | Speak Screen |
| A report, thesis or book you’ll come back to | A reader app |
| A scanned document | Neither, until it’s been through OCR |
The last row catches a lot of people. Why scanned PDFs have nothing to read.
Where Aloud fits
Aloud is a reader app for EPUBs and text PDFs, and I make it. Like Apple’s speech, the narration is generated on the iPhone, so documents aren’t uploaded and it works offline. It doesn’t replace Speak Screen for everyday reading.
Aloud for long documents
Chapters, a saved place and a sleep timer, with repeated page headers skipped. The voice runs on your iPhone and you don't need an account.
Common questions
How do I turn on Speak Screen on iPhone?
Go to Settings, then Accessibility, then Spoken Content, and switch on Speak Screen. Then swipe down from the top of the screen with two fingers in any app.
What is the difference between Speak Screen and Speak Selection?
Speak Selection reads text you've highlighted, from a Speak button in the menu that appears when you select text. Speak Screen reads everything on the current screen from the top.
Can I get better voices for Speak Screen?
Yes. In the Spoken Content settings, under Voices, you can download enhanced and premium voices for each language. They're bigger downloads and sound much more natural than the defaults.
Is Speak Screen private?
Yes. Apple's built-in speech runs on the device and needs no account. Reader apps vary, so check whether one uploads documents or needs an account before you give it anything private.
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