You are trying to send an important job application, signed contract, or financial disclosure over Gmail or Outlook on your Android phone, only to be stopped by the dreaded error: 'Attachment exceeds the 25 MB limit.'
Most email providers enforce a strict 25 MB cap on total attachment size. Here is how to compress your PDF on Android down to under 5 MB or 10 MB in seconds without losing readability or uploading your private documents to third-party websites.
Why Scanned PDFs Exceed 25 MB
When you photograph or scan physical pages, smartphone cameras capture high-density uncompressed image data (often 5 to 8 MB per page). A 5-page document can easily exceed 30 MB.
Compression repacks the image streams using intelligent downsampling, reducing the file size by 60% to 85% while keeping text clear and legible.
Choosing the Right Compression Preset in OfflyPDF
OfflyPDF provides 3 targeted presets to help you beat email size limits:
- Balanced (Recommended): Reduces file size by 50-70% with virtually no visible difference on mobile or desktop screens. Perfect for standard email submissions.
- Extreme: Maximizes size reduction (up to 85%+), ideal for government job portals with strict 2 MB or 5 MB upload limits.
- High Quality: Light compression that preserves maximum photograph sharpness while cleaning up metadata bloat.
Frequently asked questions
Quick answers to what people ask most about this topic.
Open OfflyPDF, select 'Compress PDF', pick your document, choose the 'Balanced' preset, and tap compress. The file will be reduced in seconds locally, allowing you to attach it directly in Gmail.
Never let email attachment limits delay an important deadline. Compressing PDFs on-device is instant, reliable, and ensures your private paperwork stays safe.
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