Read PDF Expert Aloud — Free TTS for Readdle's Pro PDF
PDF Expert is the polished Readdle PDF app iPad users carry to the Mac. CastReader adds what it's missing: Kokoro-quality TTS with word-level highlight on the real PDF Expert window. Select any text, click ▶, listen. Native Accessibility path — no Screen Recording permission.
macOS native · Free · No login · 40+ languages · Native AX, no OCR
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Highlight follows each spoken word directly inside your PDF Expert window.
One App Covers Every Mac PDF & Research Reader
Same gesture, same word-level highlight — across every native PDF app professionals actually use.
Preview
Apple's PDF viewer
PDFgear
Free PDFKit reader
Adobe Acrobat Reader
Industry standard
Skim
Academic favorite
PDF Expert
Readdle paid PDF
Three Steps — Native, No OCR
PDF Expert is a native Cocoa app built on Apple's PDFKit and exposes text through macOS Accessibility. CastReader reads it directly — no screen capture, no OCR, pixel-perfect highlight.
Install
Download CastReader for Mac (.dmg). Grant Accessibility permission once. PDF Expert doesn't need Screen Recording permission.
Select
Open any PDF in PDF Expert. Drag-select the paragraph you want to hear — annotated clause, report section, or scanned OCR text.
Click ▶
A play button appears next to your selection. One click — audio starts and the highlight glides inside the actual PDF Expert window, word by word.
When PDF Expert Users Add Read-Aloud
PDF Expert users bought it for speed, polish, and annotation power. Adding CastReader keeps that experience and fills the one missing capability.
Review long contracts with annotations
Keep PDF Expert's highlight and comment workflow. Layer audio on top — listen at 0.9× to catch asymmetric clauses, annotate as you go.
Hear your iPad-annotated PDFs on Mac
Annotated an arXiv paper on iPad in PDF Expert? Open it on Mac, select any section, listen while eyes scan your own highlights.
Proof-listen your own drafts
Export manuscripts to PDF, open in PDF Expert, listen. Hearing your prose catches awkward phrasing that eyes skim past.
Review scanned receipts and invoices
PDF Expert's OCR is fast. CastReader reads the recognized layer aloud — good for audit review at 1.25× while eyes check line items.
Read non-English PDFs
Chinese contracts, Japanese research, Spanish legal text — CastReader auto-detects and switches to native voices at sentence boundaries.
Triage long reports at 1.5×
Industry reports and whitepapers — 40-page PDFs that take an hour to skim can be absorbed in 25 min at 1.5× while eyes scan charts.
Why CastReader Is the Right TTS for PDF Expert
PDF Expert paid the price for polish — smooth scrolling, fast search, iPad sync. It's missing one thing: proper TTS. macOS Speak Selection uses legacy voices, no highlight, no resume. CastReader fixes that.
Pixel-perfect highlight on the real window
Transparent overlay tracks each spoken word on the actual PDF Expert document — not a clone pane or sidebar. Pixel-aligned via AX.
40+ natural voices
Kokoro-quality voices across English, Chinese, Japanese, Spanish, French, German, Korean — indistinguishable from narration.
Variable speed, click to jump
1.5× for triage, 0.9× for careful review. Click any word to resume from there — something macOS system TTS cannot do.
Free forever — even though PDF Expert isn't
No account, no seat license, no daily word limit. PDF Expert is paid; CastReader is free. The two stack without adding another subscription.
Common Questions
How do I read PDF Expert text aloud on Mac?▾
Install CastReader for Mac, grant Accessibility permission, open any PDF in PDF Expert, drag-select a paragraph, then click the floating ▶. Word-level highlight appears on your real PDF Expert window.
Does PDF Expert have built-in text-to-speech?▾
PDF Expert doesn't ship its own TTS. You can use macOS Speak Selection (legacy voices, no highlight, no resume). CastReader adds Kokoro-quality voices, word-level highlight on the real PDF Expert window, and variable speed.
Will CastReader conflict with PDF Expert's annotation tools?▾
No. CastReader only triggers on explicit text selection + ▶ click. PDF Expert's highlight, comments, stamps, form-fill, and edit-mode all work untouched.
Does PDF Expert need Screen Recording permission?▾
No. PDF Expert is a native Cocoa app built on Apple's PDFKit and exposes text through macOS Accessibility. Only Accessibility permission is required.
Will it work on scanned PDFs?▾
PDF Expert has built-in OCR for image PDFs. Once the OCR layer is applied, CastReader reads the recognized text the same way it reads native text PDFs.
Do I need the PDF Expert subscription to use CastReader?▾
No. CastReader is an independent free app. It works with PDF Expert free trial, paid PDF Expert, or any other Mac PDF app. The two have no account relationship.
Can I listen to Chinese or Japanese PDFs?▾
Yes. CastReader auto-detects CJK and switches to native Mandarin / Japanese / Korean voices at sentence boundaries.
Is it really free?▾
Yes. 100% free — no account, no credit card, no premium voice gate, no daily word limit.
Ready to Add TTS to PDF Expert?
Install once. Open any PDF in PDF Expert. Select. Click ▶. Listen. Free for every Mac — stacks with your PDF Expert license.