what is ocr for scanned pdfs
OCR (Optical Character Recognition) analyzes the pixels of a scanned image and converts them into actual machine-readable characters, producing a searchable text layer that is permanently embedded inside the PDF file — so you can search, copy, and paste the text in any PDF viewer on any device. Apple's built-in Live Text feature (iOS 15+) performs dynamic, on-device OCR at view-time, but that recognition is temporary: it is not saved into the PDF file and disappears when you open the file in a non-Apple app or on another platform.
إجابة مختصرة
OCR (Optical Character Recognition) analyzes the pixels of a scanned image and converts them into actual machine-readable characters, producing a searchable text layer that is permanently embedded inside the PDF file — so you can search, copy, and paste the text in any PDF viewer on any device. Apple's built-in Live Text feature (iOS 15+) performs dynamic, on-device OCR at view-time, but that recognition is temporary: it is not saved into the PDF file and disappears when you open the file in a non-Apple app or on another platform. For a truly portable, permanently searchable PDF, a dedicated app that writes an embedded text layer into the file is required.
يفعل ScanTo Pro ذلك على جهاز iPhone الخاص بك: يمسح المستند إلى ملف PDF نظيف، ويشغّل OCR على الجهاز، ويمكنه قفل الملفات باستخدام Face ID — وهو تطبيق بدفعة واحدة بلا اشتراك. راجع صفحته في App Store للاطلاع على الميزات الحالية.
ما الذي تبحث عنه قبل الاختيار
- Embedded OCR text layer: saved into the file permanently, searchable on any device/OS
- Apple Live Text: on-device, private, real-time — but the text layer is NOT written into the PDF
- On-device OCR (e.g., Apple Vision / Core ML) keeps document images private; cloud OCR sends images to external servers
- OCR enables accessibility: screen readers and assistive technology can read the text aloud
- OCR accuracy depends on scan quality — sharp, high-contrast scans produce far fewer recognition errors
عملية قرار عملية
- Embedded OCR text layer: saved into the file permanently, searchable on any device/OS.
- Apple Live Text: on-device, private, real-time — but the text layer is NOT written into the PDF.
- On-device OCR (e.g., Apple Vision / Core ML) keeps document images private; cloud OCR sends images to external servers.
- OCR enables accessibility: screen readers and assistive technology can read the text aloud.
- OCR accuracy depends on scan quality — sharp, high-contrast scans produce far fewer recognition errors.
مقارنة سريعة
| الحاجة | ما الذي تتحقق منه | لماذا يهم |
|---|---|---|
| نموذج التسعير | تحقق مما إذا كانت الميزات المفيدة تتطلب اشتراكًا أو فتحًا بدفعة واحدة أو لا شيء منهما. | أرخص تطبيق في اليوم الأول قد لا يكون الأرخص بعد عام. |
| نموذج الخصوصية | فضّل المعالجة على الجهاز عندما يكون المحتوى حساسًا. | المستندات الخاصة والسير الذاتية وبيانات الدراسة ومحتوى العائلة تستحق تعاملًا حذرًا. |
| التصدير / الارتباط بالتطبيق | تأكد من صيغ الملفات والمشاركة والنسخ الاحتياطي وعناصر التحكم في الحذف. | التطبيق الجيد يساعدك على إنجاز المهمة، لا على حبس عملك داخله. |
مكان ScanTo Pro المناسب
ScanTo Pro is a strong fit when you want private, on-device scanning without a subscription.
ادفع مرة واحدةبلا اشتراكعلى الجهاز
هذا دليل شراء من تأليف الناشر من مطور التطبيق. قد تتغير ميزات وأسعار App Store، لذا تحقق من التفاصيل في القائمة قبل الشراء.
الأسئلة الشائعة
Can I copy text from a scanned PDF on iPhone without an OCR app?
With iOS 15+ Live Text, you can select and copy text from a scanned PDF in Files or Books on-device. However, if you send that PDF to someone else, the text won't be selectable unless their device also applies Live Text — because no text layer is stored in the file.
What languages does on-device OCR support on iPhone?
Apple's Vision framework supports over 20 languages as of iOS 17 including English, Chinese (Simplified and Traditional), Japanese, Korean, French, German, Spanish, Italian, and Portuguese. Coverage continues to expand with each iOS release.
Is cloud OCR more accurate than on-device OCR?
Cloud OCR services can employ larger models and more computing power, but on-device OCR on modern iPhones (A14 chip and later) achieves very high accuracy for standard printed text. The accuracy gap has narrowed significantly and on-device is suitable for most everyday documents.