Comparison

PDFOptim vs Compress PDF

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

Head to head
About

PDFOptim

Easily compress and optimize PDF files on your iPhone and iPad. Reduce the size of large documents, saving storage space and transmission time. Offers both automatic and manual compression modes with advanced settings for image and vector graphics.

Highlights
  • Compress PDF documents
  • Optimize PDF files
  • Automatic compression mode
  • Manual compression mode
  • Adjust image resolution and quality
  • Optimize vector graphics
  • Support for password-protected PDFs
Features
Read full description

PDFOptim is a simple and intuitive way to compress, optimize and reduce PDF documents on iPhones and iPads. PDFOptim provides easy and effective ways to compress large image and graphics heavy PDF files. Inbuilt side-by-side preview to compare original and compressed PDF. * * * PDFOptim for Mac is also available on the Mac App Store. * * * Compressed PDF documents requires less disk space for storage and faster uploads and downloads saves transmission time and cost. PDFOptim rewrites the entire PDF documents using selected compression options as efficiently as possible without compromising the document's integrity. If your PDF documents are in another app (For Example Mail, DropBox or SkyDrive etc.) that uses the Open In… button, tap the button to open the PDF document in PDFOptim. You can also transfer PDF documents from your desktop computer via iTunes into PDFOptim application on your iPhone or iPad. KEY FEATURES: AUTO COMPRESSION MODE - PDFOptim analyze document’s contents and apply algorithm to generate a smallest possible PDF by maintaining the document’s visual quality. Choose one of the four predefined Auto compression methods and let the app do the hard work for you. No further user interaction required to provide technical compression options. MANUAL COMPRESSION MODE - Change compression options manually to generate optimum sized PDF of your need. You can choose compression options to set from Image Color Model, Image Resolution, JPEG Image Quality, Optimise vector graphics level and Advance option. - Image color model to choose from RGB, Gray and Mono. Selecting Monochrome color model option converts raster PDF contents into black and white which helps reduces PDF file size to greater extent. It is very helpful when compressing scanned books mainly containing text. - Image resolution ppi (pixels/inch) control to resize raster image contents. Downsampling at lower resolution decrease the file size dramatically. - Quality control. Set quality from lossless to least for resampling all raster images into PDF. It allows you to control compressed PDF size and viewing quality. -Advance options to remove PDF content properties like alternate images, page thumbnails, documents structure hierarchy and output intent. - Optimize vector graphics option removes superfluous information to reduce vector graphics heavy PDF. Increase in optimize vector from 'Level 1' to 'Level 5' reduces output PDF file size less to more respectively. This option is very useful when PDF content mainly consist of high precision vector graphics, Usually PDF drawing, note-taking and PDF markup apps creates large vector graphics heavy PDF files which can be compressed by this option efficiently. - Password protected PDF documents supported for compression using correct password. - Single or multiple compressed PDFs can be shared as single ZIP (*.zip) file. - Allows Compressed PDFs to Open In… another application, Mail, Message, Print, share PDFs to nearby iOS devices via AirDrop. - Use Copy to iTunes to save and share compressed PDFs on your desktop computer. PDF VIEWER: - Inbuilt PDF viewer with fully selectable and searchable text contents. Select and copy text to clipboard for further use. - Pinch out and Pinch in to ZoomIn and ZoomOut view and search feature to find a character, word and sentence. - Scroll through your document by thumbnail view or Go to page feature. Note: PDFOptim is standalone application running natively to compress PDF documents securely on your iOS device. You can refer User Manual for any assistance Or Contact Support. *The free version has limitation to export one compressed PDF per week. Get Premium to remove all restrictions and start exporting an unlimited number of compressed PDFs. Privacy Policy: http://rootrisetech.com/pdfoptim-privacy-policy Terms of Use(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Compress PDF

Reduce the file size of your PDF documents, especially those with many images. This app offers compression options to shrink PDFs without compromising quality, saving storage space and transmission time. It's a lightweight tool for optimizing memory usage.

Highlights
  • Full size compression
  • Ultra fast processing
  • Low battery usage
  • Supports all file types
  • Optimize memory usage
  • Integrates with other apps
Features
Read full description

Compress PDF file size makes it possible for anyone to reduce your PDF documents size, especially useful for those PDF files with many scan graphics and photos. Compressed PDF documents requires less disk space for storage and faster uploads and downloads saves transmission time and cost. This app gives you access to compression options to help you to reduce PDF file size without compromising the document's integrity. compression app app provides you a great chance to use the pdf size limit zip and enjoy pdf reduce size app. In this pdf size limit zip app you have to play as a pdf size reducer. 
Features of Compress PDF Files Size:
- Full size compression
- Ultra fast processing power
- Less Battery usage
- Supports all other files also How to play Compress PDF Files Size:
- Choose your file
- Click compress and give a name
- The zip file will appear in the file browser this PDF compress is very useful and very lightweight application. you can reduce size for any PDF file. and Optimize your Memory for other usages. Compressed PDF documents requires less disk space for storage and faster uploads and downloads saves transmission time and cost. The PDFOptim gives you access to compression options to help you to reduce PDF file size without compromising the document's integrity. PDFOptim rewrites the entire PDF documents using selected compression options as efficiently as possible. Some PDF documents might not get compressed, because the PDF documents might be already compressed or have nothing much to compress. If your PDF documents are in another app (For Example Mail, DropBox or SkyDrive etc.) that uses the Open In… button, tap the button to open the PDF document in PDFOptim. You can also transfer PDF documents from your desktop computer via iTunes into PDFOptim application on your iPhone or iPad. If you like this app please share with other and give review or rating. SUBSCRIPTION INFORMATION : - Subscribe for unlimited access to all the Premium features. - - Subscription is automatically renewed unless canceled 24 hours before the renewal - Payment will be charged to iTunes Account at confirmation of purchase - Account will be charged for renewal within 24-hours prior to the end of the current period, at the same price - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Privacy Policy : https://nitinkatrodiya.wordpress.com/privacy-policy/ & Terms of Service: https://nitinkatrodiya.wordpress.com/terms-and-condition/

Screenshots

PDFOptim4 screens
Compress PDF4 screens

Verdict

The call

The clearest difference is review sentiment: PDFOptim at 76% against Compress PDF's 20%. PDFOptim also leads on rating (4.7 vs 1.0) and ratings volume (292 vs 3). Compress PDF's advantage is update cadence (every 6 weeks vs every 5 months) and iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and monetization model 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. PDFOptim sells 3 in-app purchases, starting at $0.99 per month and Compress PDF sells 1 in-app purchase, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

PDFOptim holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: PDFOptim has 292 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 76% of PDFOptim's written reviews are positive against 20% of Compress PDF's.

UpkeepUpdate frequency

PDFOptim ships an update every 5 months, Compress PDF every 6 weeks. The most recent releases landed on September 21, 2026 and July 20, 2026 respectively.

Scorecard5 real differences · 5 level
PDFOptim versus Compress PDF: the parameters behind the verdict, then further details
ParameterPDFOptimCompress PDF
PriceFreeFree
Rating4.7 (292 ratings) — better1.0 (3 ratings)
Positive reviews75.6% of reviews — better20.0% of reviews
Number of ratings292 — better3
Update frequencyEvery 5 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size8 MB12 MB
Age rating4+4+
DeveloperRootRise Technologies Pvt. Ltd.Nitin Katrodiya

Customer experience

PDFOptim

All ratings292 ratings
Positive93.5%
Neutral1.7%
Negative4.8%
Written reviews82 reviews
Positive75.6%
Neutral3.7%
Negative20.7%

Compress PDF

All ratings3 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews5 reviews
Positive20.0%
Neutral0.0%
Negative80.0%

Bugs and requests

PDFOptim

Reported bugs

11 issues
  • App not launching on iOS 18.0.1
  • App freezes during launch
  • App won't take purchases
  • Cannot optimize certain PDFs
  • Compression not effective on marked-up PDFs
Show 6 more
  • App no longer works after updates
  • File compressed to a slightly smaller size with no significant reduction
  • Graphics become unreadable or highly degraded
  • App crashes
  • Multitasking, drag and drop not working
  • Doesn't use full screen on new iPads

Requested features

6 requests
  • Support for iOS shortcuts
  • macOS version integration/cross-platform compatibility
  • Improved handling of specific file types like GoodNotes
  • Better optimization for handwritten notes within PDFs
  • Cloud storage for compressed documents (iCloud)
Show 1 more
  • Update for latest OS versions and multitasking features

Compress PDF

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

PDFOptim

Subscriptions2
  • Premium : Monthly Access$0.991 Month
  • Premium : Yearly Access3 Days trial$2.991 Year
One-time1
  • Premium : Lifetime Access$4.99
1 purchases

Compress PDF

Subscriptions1
  • CompressPDF Premium Version$0.997 Days

Questions

Is PDFOptim free?
PDFOptim is free to download, with in-app purchases available.
Is Compress PDF free?
Compress PDF is free to download, with in-app purchases available.
Which has better reviews, PDFOptim or Compress PDF?
PDFOptim is rated higher. PDFOptim averages 4.7 out of 5 from 292 ratings, while Compress PDF averages 1.0 from 3 ratings.
Do PDFOptim or Compress PDF have ads?
Neither PDFOptim nor Compress PDF shows ads.
Which is updated more often, PDFOptim or Compress PDF?
PDFOptim ships an update every 5 months, and Compress PDF every 6 weeks. Most recently, PDFOptim was updated on September 21, 2026 and Compress PDF on July 20, 2026.

Other comparisons