Comparison

PDFToolbox vs PDF Compressor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PDFToolbox

This app offers a suite of tools for local PDF processing, including converting PDFs to images and vice versa, adding text watermarks, and encrypting/decrypting documents with passwords. It prioritizes user privacy by performing all operations on the device without internet access.

Highlights
  • Convert PDF to Image (JPG, PNG, GIF)
  • Convert Image to PDF
  • Add custom text watermarks
  • Encrypt PDFs with passwords
  • Remove PDF password protection
  • Batch export and multi-image processing
Features
Read full description

PDF Toolbox is a powerful PDF processing tool that works entirely on your device, with no internet connection required, ensuring your file privacy and security. We provide comprehensive PDF handling solutions that allow you to easily convert, protect, and customize your PDF documents. Key Features PDF to Image Conversion Transform PDF documents into high-quality images with multiple customization options: • Image format selection: JPG, PNG, or GIF • Result type: Multiple separate images or one large image • Color modes: Color, grayscale, or black & white • Quality levels: Low, medium, high to meet different needs • Batch export: Export all pages with one tap Image to PDF Conversion Easily merge multiple images into PDF documents: • Multi-image processing: Select multiple images simultaneously • Flexible conversion: Merge into a single PDF or generate multiple separate PDFs • Color processing: Color mode, grayscale mode, black & white mode • Source selection: Choose images from your photo library or file system Add Watermark Add professional text watermarks to your PDFs: • Custom watermark text • Adjustable font size • Transparency settings (0-100%) • Rotation angle (0-360°) • Horizontal/vertical spacing control • Automatically applied to all PDF pages Add Password Protect important documents with password encryption: • Secure encryption: Using standard PDF encryption technology • Simple operation: Add password protection with one tap • Secure storage: Encrypted files saved locally only Remove Password Easily remove encryption from PDFs with known passwords: • Enter the correct password to unlock PDF documents • Remove password protection with one tap • Preserve all formatting and content of the original document Our Advantages • Completely local processing: All file processing is performed locally on your device, never uploaded to any servers • Privacy protection: Your document contents remain only on your device • Efficient processing: Optimized processing engine provides fast conversion experience • Rich options: Meet various customization needs for professional users • High-quality output: Maintain the clarity and formatting of original documents Use Cases • Students: Convert study materials, course slides, and e-books • Professionals: Process work documents, add company watermarks or password protection • Designers: Convert PDF designs to images for editing or sharing • Teachers: Add watermarks to teaching materials to prevent unauthorized distribution • Anyone who needs simple, efficient PDF file processing Download PDF Toolbox now and experience professional-grade PDF processing features! END USER LICENSE AGREEMENT (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ PRIVACY POLICY: https://jiw.github.io/PDFToolbox/privacy_policy_en.html

About

PDF Compressor

Features
Read full description

Compresso helps you reduce PDF file size quickly while keeping documents clear and readable. Compress, save space, and share smaller PDFs in just a few taps. Everything runs directly on your iPhone for speed and privacy. Key features: • Fast on-device PDF compression • Multiple compression levels for size vs quality • Preserve readability for text-heavy files • Works great for scans, reports, and forms • Simple, clean workflow: import, compress, share • Compression history for easy tracking • Optional Face ID app lock • Private processing — files stay on your device Pro subscription: Compresso Pro includes unlimited compression with Weekly or Annual plans. Subscription details: • Payment is charged to your Apple ID at confirmation of purchase • Subscription renews automatically unless canceled at least 24 hours before the end of the current period • Your account is charged for renewal within 24 hours before the end of the current period • You can manage or cancel your subscription anytime in App Store account settings Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://1kbapps.com/pdf-crush-support-privacy-terms/

Screenshots

PDFToolbox4 screens
PDF Compressor4 screens

Verdict

The call

The clearest difference is update cadence: PDF Compressor at every 3 months against PDFToolbox's every 7 months. PDFToolbox's advantage is iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. PDFToolbox sells 3 in-app purchases, starting at $0.99 per 7 days and PDF Compressor sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PDFToolbox ships an update every 7 months, PDF Compressor every 3 months. The most recent releases landed on October 13, 2026 and October 4, 2026 respectively.

Scorecard2 real differences · 7 level
PDFToolbox versus PDF Compressor: the parameters behind the verdict, then further details
ParameterPDFToolboxPDF Compressor
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 7 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.0 — better17.6
Further details — not scored
Size8 MB2 MB
Age rating4+4+
Developer钊辰 王Vikram Singh

In-app purchases

3 purchases

PDFToolbox

Subscriptions2
  • Weekly$0.997 Days
  • Yearly$9.991 Year
One-time1
  • Lifetime$29.99
2 purchases

PDF Compressor

Subscriptions2
  • CrushPDF Premium Weekly$2.997 Days
  • CrushPDF Premium Annual$19.991 Year

Questions

Is PDFToolbox free?
PDFToolbox is free to download, with in-app purchases available.
Is PDF Compressor free?
PDF Compressor is free to download, with in-app purchases available.
Do PDFToolbox or PDF Compressor have ads?
Neither PDFToolbox nor PDF Compressor shows ads.
Which is updated more often, PDFToolbox or PDF Compressor?
PDFToolbox ships an update every 7 months, and PDF Compressor every 3 months. Most recently, PDFToolbox was updated on October 13, 2026 and PDF Compressor on October 4, 2026.

Other comparisons