Smart PDF Compressor vs UnderLimit

Smart PDF Compressor is a free, offline PDF compressor for iPhone and iPad that helps anyone emailing, uploading or storing a PDF shrink it by up to 95% — without the file ever leaving the device. ALL PROCESSING IS LOCAL Your documents never leave your device. No internet connection required, no cloud uploads, no data collection. Complete privacy guaranteed. KEY FEATURES - Size Estimates First: See the estimated size for each option before you compress - Three Presets: Best quality, Balanced (recommended) and Smallest file - Smart Compression: Automatically detects scanned vs. digital pages and applies suitable settings - Batch Compression: Compress multiple PDFs at once with progress tracking - Share as ZIP: Bundle several compressed PDFs into one ZIP archive and name it before you share - Advanced Options: Adjust image quality, resolution (72-300 DPI) and black & white conversion - Side-by-Side Preview: Compare original and compressed pages before saving - File History: Browse, preview, rename, and share all your compressed files - Light and Dark Mode: Follows your device's appearance setting - Works on iPhone and iPad HOW IT WORKS 1. Tap Choose PDF and pick a file from Files 2. Choose a size — each option shows its estimated result 3. Tap Compress PDF and see the exact before and after sizes 4. Share or save your compressed PDF, or send several as one ZIP PERFECT FOR - Reducing email attachment sizes - Saving storage space on your device - Compressing scanned documents - Preparing files for upload to web forms - Sharing large PDFs via messaging apps Smart PDF Compressor uses Apple's PDFKit and advanced image processing to deliver fast, reliable compression without sacrificing readability.

Make your files fit the limit. UnderLimit helps you reduce photos and PDFs to the file size you actually need. Choose your target size, and UnderLimit handles the compression while preserving the best quality possible. PERFECT FOR FILE SIZE LIMITS Need a photo under 1 MB? A PDF under 5 MB? An attachment small enough to upload or send? Set the target size and let UnderLimit do the work. PHOTO COMPRESSION • Compress photos to a target file size • Reduce image size in KB or MB • Keep the best quality possible • Quickly prepare images for uploads, forms, email, and sharing PDF COMPRESSION • Reduce PDF file size • Choose the maximum size you need • Prepare PDFs for upload limits and attachments • Simple, fast workflow SMART RECOMMENDATIONS Not sure which target size to choose? UnderLimit can help you select an appropriate size for your file. PRIVATE BY DESIGN Your files are processed directly on your device. Your photos and PDFs don't need to be uploaded to a remote server for compression. SIMPLE PRICING Start using UnderLimit for free. If you need more, unlock UnderLimit Unlimited with a one-time purchase. No subscription. No ads. No account required. UNDERLIMIT IS USEFUL FOR • Online forms and portals • Email attachments • Applications and document submissions • Websites with maximum upload sizes • Reducing photos before sharing • Compressing PDFs for size-restricted uploads Stop guessing compression levels. Choose the size you need and make your file fit the limit.