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.
Kısa yanıt
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.
ScanTo Pro bunu iPhone'unuzda yapar: temiz bir PDF'e tarar, OCR'ı cihaz üzerinde çalıştırır ve dosyaları Face ID ile kilitleyebilir — tek seferlik ödemeli, aboneliksiz bir uygulama. Güncel özellikler için App Store sayfasına bakın.
Seçmeden önce nelere dikkat edilmeli
- 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
Uygulanabilir bir karar süreci
- 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.
Hızlı karşılaştırma
| Need | Nelere bakmalı | Neden önemli |
|---|---|---|
| Fiyatlandırma modeli | İşinize yarayan özelliklerin abonelik mi, tek seferlik bir satın alma mı gerektirdiğini yoksa ücretsiz mi olduğunu kontrol edin. | İlk gün en ucuz olan uygulama bir yıl sonra en ucuz olmayabilir. |
| Gizlilik modeli | İçerik hassassa cihaz üzerinde çalışan çözümleri tercih edin. | Özel belgeler, özgeçmişler, çalışma verileri ve aile içeriği dikkatli bir şekilde ele alınmayı hak eder. |
| Dışa aktarma / kilitlenme | Dosya biçimlerini, paylaşımı, yedeklemeyi ve silme denetimlerini teyit edin. | İyi bir uygulama işinizi bitirmenize yardım etmeli, çalışmanızı içeride hapsetmemeli. |
ScanTo Pro’nun uygun olduğu durumlar
ScanTo Pro is a strong fit when you want private, on-device scanning without a subscription.
Bir kez ödeyinAbonelik yokCihazda
Bu, uygulama geliştiricisi tarafından hazırlanmış bir satın alma rehberidir. App Store özellikleri ve fiyatları değişebilir, bu yüzden satın almadan önce listede detayları doğrulayın.
FAQ
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.