TTS ReaderCan you turn a PDF into an audiobook on iPhone?
You can listen to a PDF like an audiobook: we make TTS Reader, a free iPhone app that reads the whole document aloud with voices that run on the device, and you control it from the Lock Screen. It does not save an audio file, though: there is no MP3 export. If you need a file, use another tool: for example NaturalReader’s paid MP3 download, a web converter, or Apple’s Shortcuts app.
We make TTS Reader, so read the comparisons here as one side’s view. Facts about other services come from their App Store listings, websites and help pages, and for Apple’s Shortcuts from an independent action directory, checked on 31 October 2026. TTS Reader is our iPhone app, not the ttsreader.com web service.
Do you need an audio file, or just to listen?
Most “PDF to audiobook” tools make an audio file, usually MP3 or M4A, that you download and play in another app. On an iPhone you often do not need the file: a reader app can speak the PDF directly, for as long as the document lasts. The table shows which way fits which need.
| What you want | Listen in a reader app (TTS Reader) | Make an audio file (MP3 or M4A) |
|---|---|---|
| Listen to a long PDF on your own iPhone | Yes, free, no page limit | Works, but you convert first |
| Change speed while listening | Any time, 0.5× to 3× | Depends on the player; the voice speed is fixed in the file |
| See the text while it is read | Yes, with sentence and word highlighting | No, audio only |
| Play in another app, on another device or in the car’s media player | No | Yes |
| Send the audio to someone | No | Yes |
| Keep the PDF on your iPhone | Yes, nothing is uploaded | Web converters need the file uploaded |
If the rows on the left match what you want, you do not need a converter. If you need the right-hand column, see how to get an audio file below.
How do you listen to a long PDF like an audiobook in TTS Reader?
Open the PDF in TTS Reader, press play and lock the phone; the app reads the whole document, and there is no page limit. The steps:
- Add the PDF: from the Add menu in the app, from the Files app, or from Mail or Safari with the Share button.
- Press Play, or tap any sentence to start from there, for example at chapter one instead of the title page.
- Pick a speed from 0.5× to 3×, or a ready-made mode: Learn, Bedtime, Natural, Commute, Skim or Turbo. You can also add a short pause between words.
- Lock the iPhone. Playback controls are on the Lock Screen and in a Live Activity; there is also a widget and a Control Center control.
What makes a PDF sound like a book rather than a page dump: TTS Reader joins broken lines into sentences, puts back words split by a hyphen at the end of a line, and skips running headers and page numbers. It detects the language of the text and picks a matching voice, in 31 languages. The page is shown in its original layout with the current sentence and word highlighted, so you can look down and follow along at any moment. More on the reading itself: how TTS Reader reads a PDF aloud.
The app also keeps listening stats on the iPhone. It does not have premium, celebrity or cloned voices: there are 25 on-device voices, 10 built in for 31 languages and 15 optional English voices.
Why can’t TTS Reader export an MP3?
TTS Reader speaks the text on the iPhone while you listen and does not save that speech as a file, so there is no MP3 or M4A to export, share or play in another app. This is a limit of version 1, and we say so plainly: if you need audio files, TTS Reader is not the right tool.
What you get in exchange:
- no conversion step and no files filling up storage: you open the PDF and it starts;
- speed changes take effect right away, because nothing was recorded at a fixed speed;
- you can jump to any sentence by tapping it, instead of scrubbing through an audio track;
- the PDF is never uploaded, because the voices run on the device;
- it is free with no character or page allowance, since no paid server makes the audio.
What you lose: you cannot listen on a device without TTS Reader, send the audio to anyone, or put it in a podcast or music app.
How can you get an MP3 of a PDF on iPhone?
If you do need a file, there are three common routes. Each has a cost or a catch.
- NaturalReader, paid. Its iPhone app lists “Download MP3: Save audio files in MP3 format for offline listening on any device.” According to NaturalReader’s help center, MP3 conversion is a paid feature: free users cannot convert, subscribers can convert up to 1 million characters a month, one conversion is capped at 20 pages, and files stay in its Audio Library for 30 days. Plans in the US App Store start at $9.99 a month or $59.99 a year. We compare the two apps in TTS Reader vs NaturalReader.
- Web converters. Sites such as NoteGPT’s PDF to audiobook tool take an uploaded PDF and return an MP3 to download; NoteGPT lists a 50 MB upload limit. This means the document goes to someone else’s server, which matters for contracts, medical records or anything private. Check each site’s privacy policy before uploading.
- Apple’s Shortcuts app. Shortcuts has an action called “Make Spoken Audio from Text” that creates an audio file from text with the system voices, on iPhone and iPad as well as the Mac. You have to build the shortcut yourself and feed it the PDF’s text; it has no page highlighting and no clean-up of headers and page numbers. We have not tested it on long documents, and Apple does not document its limits.
Before converting, check the rights to the book (see copyright below).
Can you listen to a scanned PDF or a paper book?
Yes. If a PDF is only pictures of pages, with no text layer, TTS Reader recognises the text page by page on the iPhone, shows the progress, and then reads it like any other document. For a paper book or handout, tap Add, choose Scan and point the camera at the page, or pick a photo. Clear printed pages work best; neat handwriting may be recognised partly, messy handwriting usually is not. Long scans take a while to recognise, and the scans stay in your library on the device. Details: scan to speech on iPhone.
Can you listen to a PDF offline, on a plane or underground?
Yes, and without converting anything first. TTS Reader’s 10 multilingual voices are part of the app and read 31 languages offline from the first launch. The 15 optional English voices, US and UK, work offline after a one-time download of about 190 MB. Your PDFs, scans and pasted text are read entirely on the iPhone. A connection is needed only to download a book from the free catalog, import a web article from a link, or download the optional English voices. With an MP3 service, by contrast, offline listening usually means converting and downloading files in advance. More: how offline text to speech works.
Is it legal to turn a book into an audiobook?
Listening to your own files with text to speech for yourself is what TTS Reader is for. Making an audiobook of someone else’s book to share or sell is a different matter. In the United States, section 106 of the Copyright Act gives the copyright owner the exclusive rights “to reproduce the copyrighted work in copies or phonorecords”, “to prepare derivative works based upon the copyrighted work” and to distribute copies to the public. Other countries have similar rules. This is general information, not legal advice.
- TTS Reader does not read Kindle books or other DRM-protected ebooks, and it does not remove DRM.
- It has no export, so it cannot be used to produce audiobooks for sale or distribution.
- For classics, the app includes about 70,000 public-domain books from Project Gutenberg that you can listen to directly.
Sources
- NaturalReader - Text To Speech, US App Store listing (NaturalSoft Limited): “Download MP3: Save audio files in MP3 format for offline listening on any device”; in-app purchases from $9.99 a month (Premium, monthly) and $59.99 a year (Premium, yearly). Checked 31 October 2026.
- NaturalReader help center: Working with Text and Audio (Personal Version), dated 11 September 2025: MP3 conversion is a paid feature, not available to free users or with Free voices; up to 1 million characters a month for subscribers; 20 pages per conversion; files kept in the Audio Library for 30 days. Checked 31 October 2026.
- NoteGPT: AI PDF to Audiobook Converter: upload a file, download the result as MP3, upload limit of 50 MB. Checked 31 October 2026.
- Matthew Cassinelli, Shortcuts action directory: Make Spoken Audio From Text: “Creates an audio file from text, using text-to-speech”, with rate, pitch, language and voice options, on iPhone, iPad and Mac. Apple does not publish a reference page for this action. Checked 31 October 2026.
- U.S. Copyright Office, Title 17, Chapter 1, section 106: exclusive rights of the copyright owner to reproduce, prepare derivative works and distribute copies. Checked 31 October 2026.