how to reduce pdf file size on iphone
iOS does not include a dedicated 'Compress PDF' button in the native Files app as of iOS 18/26; the most common workaround is the Print-to-PDF trick (open PDF ← Share ← Print ← pinch out ← Share ← Save to Files), which re-renders and re-compresses the embedded images, often producing a smaller file — but results are unpredictable and quality may degrade. The most effective approach is at the point of scanning: setting a lower DPI (150 DPI is generally sufficient for readable text), using JPEG compression rather than lossless, and scanning in grayscale or black-and-white mode instead of colour can reduce file size by 60–80% compared to defaults.
إجابة مختصرة
iOS does not include a dedicated 'Compress PDF' button in the native Files app as of iOS 18/26; the most common workaround is the Print-to-PDF trick (open PDF ← Share ← Print ← pinch out ← Share ← Save to Files), which re-renders and re-compresses the embedded images, often producing a smaller file — but results are unpredictable and quality may degrade. The most effective approach is at the point of scanning: setting a lower DPI (150 DPI is generally sufficient for readable text), using JPEG compression rather than lossless, and scanning in grayscale or black-and-white mode instead of colour can reduce file size by 60–80% compared to defaults. Dedicated scanner and PDF apps expose these controls directly and are the reliable path to predictable compression.
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
- iOS native 'Print to PDF' workaround can reduce file size but results are inconsistent
- Scan resolution (DPI) is the biggest lever: 150 DPI gives readable text; 300 DPI for archival quality
- JPEG compression level directly trades off file size against image quality (blocking artifacts at extreme compression)
- Grayscale or black-and-white mode significantly shrinks colour scan PDFs with no text quality loss
- True PDF compression (resampling, removing metadata, flattening layers) requires a dedicated app
عملية قرار عملية
- iOS native 'Print to PDF' workaround can reduce file size but results are inconsistent.
- Scan resolution (DPI) is the biggest lever: 150 DPI gives readable text; 300 DPI for archival quality.
- JPEG compression level directly trades off file size against image quality (blocking artifacts at extreme compression).
- Grayscale or black-and-white mode significantly shrinks colour scan PDFs with no text quality loss.
- True PDF compression (resampling, removing metadata, flattening layers) requires a dedicated app.
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
What DPI should I use for an everyday text document scan?
150 DPI produces clearly readable text in a reasonably small file and is a common default in quality scanner apps. Use 300 DPI for fine print, small fonts, or documents you may need to print later.
Does converting a scan to black-and-white reduce file size?
Yes — significantly. A black-and-white (binary) scan of a text document can be 5–10× smaller than the same page scanned in colour, with no loss of text readability. It is not suitable for preserving photos or colour graphics.
Will compressing a PDF damage its embedded OCR text layer?
Compressing the image layer (reducing DPI or JPEG quality) does not remove an existing OCR text layer embedded in the PDF. However, if you re-scan or re-render the document, the OCR layer may need to be regenerated.