Comparison

Compress PDF vs Stamp Studio

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

Head to head
About

Compress PDF

Easily reduce the file size of PDFs and images without sacrificing quality. This utility helps you shrink large documents for sharing, uploading, or saving storage space on your device.

Highlights
  • Compress PDF files
  • Compress images
  • Custom compression levels
  • Fast PDF processing
  • Saved files manager
  • Download & share files
Features
Read full description

PDF Compressor – Compress PDF & Reduce File Size PDF Compressor is a fast, reliable, and easy-to-use app that helps you compress PDF files and images, reduce file size, and save storage on your device. If you need a simple way to shrink large PDFs for sharing, uploading, or archiving, this app is built for you. With advanced compression technology, PDF Compressor allows you to reduce PDF size without losing quality. You can also compress images to make them easier to upload, email, or store. Whether you are working with business documents, study material, invoices, or scanned files, this app helps you manage everything efficiently. Key Features: • Compress PDF Files – Reduce PDF file size quickly and securely • Image Compressor – Compress images without noticeable quality loss • Custom Compression Levels – Low, Medium, and Custom options • Fast PDF Processing – Optimized for speed and performance • Saved Files Manager – Access and manage compressed PDFs easily • Download & Share Files – Save compressed files instantly • Simple & Modern Interface – Designed for iPhone and iPad users Perfect for: - PDF compression for email and cloud upload - Reducing file size for online forms and portals - Saving storage on your iPhone or iPad - Students, professionals, and business users PDF Compressor is a subscription-based app. Premium features such as unlimited PDF compression, advanced compression controls, and enhanced file management require an active subscription. Privacy Policy: https://health-fitness-pro.fit/privacy Terms of Use: https://health-fitness-pro.fit/terms

About

Stamp Studio

Features
Read full description

Stamp Studio is a focused tool for preparing documents on your iPhone or iPad. Import a PDF, add a reusable handwritten signature or custom stamp, and export a finished copy when you are ready to share it. FEATURES • Import PDF documents from Files • Draw and save handwritten signatures • Create reusable business-style stamps and seals • Extract a stamp from a photo or camera image with a transparent background • Move, resize, rotate, and rename signatures and stamps • Place marks on individual PDF pages or create an edge seal across multiple pages • Rename imported files and export a new signed PDF YOUR FILES STAY ON YOUR DEVICE Stamp Studio processes documents, signatures, and stamps locally on your device. Camera and photo-library access are used only when you choose to capture or import an image for stamp extraction. Stamp Studio offers auto-renewable subscriptions. The Terms of Use are governed by the Apple Standard License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Compress PDF4 screens
Stamp Studio3 screens

Verdict

The call

The clearest difference is in-app purchases: Stamp Studio at none against Compress PDF's 3. Stamp Studio also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement 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. Compress PDF sells 3 in-app purchases, starting at $1.99 per 7 days. Stamp Studio asks for nothing beyond the download.

UpkeepUpdate frequency

Compress PDF ships an update every 3 weeks, Stamp Studio monthly. The most recent releases landed on September 25, 2026 and October 12, 2026 respectively.

Scorecard2 real differences · 7 level
Compress PDF versus Stamp Studio: the parameters behind the verdict, then further details
ParameterCompress PDFStamp Studio
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 3 weeks — betterMonthly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS16.616.0 — better
Further details — not scored
Size14 MB4 MB
Age rating4+4+
DeveloperESPRESSO TECH (SMC-PRIVATE) LIMITEDBeijing Yangming Jiuha Technology Co., Ltd

In-app purchases

3 purchases

Compress PDF

Subscriptions3
  • Weekly Access$1.997 Days
  • Monthly Access$3.991 Month
  • Yearly Access$29.991 Year
None

Stamp Studio

No in-app purchases

Questions

Is Compress PDF free?
Compress PDF is free to download, with in-app purchases available.
Is Stamp Studio free?
Stamp Studio is free to download, with no in-app purchases.
Do Compress PDF or Stamp Studio have ads?
Compress PDF shows ads; Stamp Studio does not.
Which is updated more often, Compress PDF or Stamp Studio?
Compress PDF ships an update every 3 weeks, and Stamp Studio monthly. Most recently, Compress PDF was updated on September 25, 2026 and Stamp Studio on October 12, 2026.

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