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For iPhone

1. Download an OCR App:

   • Go to the App Store and install an app such as Adobe Scan or Microsoft Office Lens.

2. Capture or Import Your Document:

   • Open the app and grant any necessary permissions (e.g., camera access).

   • Use the app to capture new scans or import an existing scanned PDF.

3. Run OCR:

   • The app will automatically detect text and perform OCR on the captured document.

   • Review the recognized text; most apps allow you to adjust or retake a scan if needed.

4. Save the OCR’d PDF:

   • Once satisfied with the OCR, save or export the document as a searchable PDF.

5. Listen to the Document:

   • Open the OCR’d PDF in an app that supports TTS (for example, the Books app).

   • Use your device’s Spoken Content settings (Settings > Accessibility > Spoken Content) to have the text read aloud.

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For Android

1. Download an OCR App:

   • From the Google Play Store, install an app like Adobe Scan or Microsoft Office Lens.

2. Capture or Import Your Document:

   • Open the chosen app and grant the required permissions.

   • Capture a new scan or import your scanned PDF.

3. Run OCR:

   • Allow the app to automatically perform OCR on your document.

   • Check and edit the recognized text if the app provides editing options.

4. Export the Searchable PDF:

   • Save or export the file as a searchable (OCR’d) PDF.

5. Listen to the Document:

   • Open the searchable PDF in your preferred PDF reader app that supports TTS, or use a dedicated TTS app (e.g., Voice Aloud Reader).

   • Adjust TTS settings in Settings > Accessibility > Text-to-Speech Output if needed.

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For Windows

1. Use OCR Software (Adobe Acrobat Pro DC or ABBYY FineReader):

   • Open Adobe Acrobat Pro DC (or another OCR tool like ABBYY FineReader).

2. Open Your Scanned PDF:

   • Launch the software and open the scanned PDF file.

3. Initiate OCR:

   • In Adobe Acrobat Pro DC, click on the Tools tab and select Enhance Scans.

   • Click Recognize Text > In This File.

   • Choose the appropriate language and any other OCR settings, then click Recognize Text to start the process.

4. Save the OCR’d PDF:

   • After OCR completes, save the document as a searchable PDF.

5. Listen to the Document:

   • Open the searchable PDF either in Microsoft Edge (using its Read Aloud feature) or in Acrobat Reader (via View > Read Out Loud).

   • Use the playback controls to adjust voice and speed as needed.

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For Mac

You can use Adobe Acrobat Pro DC, ABBYY FineReader for Mac, or a similar third-party app (like PDFPen) for OCR.

1. Open Your OCR Software:

   • Launch Adobe Acrobat Pro DC (or ABBYY FineReader/PDFPen).

2. Import the Scanned PDF:

   • Open the scanned PDF file within the application.

3. Run OCR:

   • In Adobe Acrobat Pro DC:

     • Go to Tools > Enhance Scans.

     • Select Recognize Text > In This File.

     • Configure language and other settings as needed, then click Recognize Text.

   • In ABBYY FineReader or PDFPen: Follow the app-specific steps to perform OCR on your document.

4. Save the OCR’d PDF:

   • Once the OCR process is complete, save the document as a searchable PDF.

5. Listen to the Document:

   • Using Adobe Acrobat Reader for Mac: Open the PDF and select View > Read Out Loud > Activate Read Out Loud, then choose your reading option.

   • Using Preview: Open the PDF in Preview, then choose Edit > Speech > Start Speaking (or select text and press the configured shortcut from System Settings > Accessibility > Spoken Content).

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Tip:
If your PDF contains only images (i.e., scanned pages without embedded text), running OCR is essential before text-to-speech can work properly. If the OCR process isn’t perfect, you may need to review and correct any errors before relying on TTS for critical reading.

These detailed steps should help you convert scanned PDFs into searchable documents across all platforms, ensuring you can then use TTS features to listen to them.