Comparison

PDFOptim vs PDF Compressor-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

PDF Compressor-Compress PDF

Easily reduce the size of your PDF files without sacrificing quality. This tool helps you shrink PDFs for faster sharing, emailing, or uploading, saving valuable storage space. It's perfect for managing large documents and scanned files efficiently.

Highlights
  • Compress PDF files without losing clarity
  • Smart compressor for scanned or large documents
  • Reduce PDF size for easy upload and sharing
  • Free compressor with high quality output
  • Preserve text and image quality
  • Choose compression level
Features
Read full description

Compress PDF files easily with our free PDF compressor tool. This app is designed to help you compress PDF, reduce file size, and save valuable storage space without losing quality. Whether you're working with large files or scanned documents, this smart PDF compressor lets you shrink PDFs for faster sharing, emailing, or uploading. Need to compress PDF files or reduce PDF size for email or storage? Just select your file, choose a compression level, and reduce size instantly, while keeping your document clean and readable. Key Features: Compress PDF files without losing clarity. Smart PDF compressor for scanned or large documents. Compress PDF reduce PDF size for easy upload and sharing. Free PDF compressor with high quality output. Preserve text and image quality while reducing MBs. Save space and manage your files more efficiently. Choose compression level to suit your needs. Intuitive design and user-friendly experience. Perfect for students, professionals or anyone handling large PDFs this app simplifies your workflow and helps you get more done. Whether you're sending documents by email, uploading them to the cloud, or freeing up device space, our free PDF compressor is the reliable solution you need. Download now and compress PDF files quickly with a tool that keeps your files small, safe, and sharp. Terms and conditions: https://www.itspdf.com/termsandconditions Privacy policy: https://www.itspdf.com/policy Disclaimer: Your privacy is fully protected. The PDF Compressor app only processes files you select and never accesses, uploads or stores any hidden data. All compression happens securely to keep your documents safe. If you have any questions, please contact us: eclix.suport@gmail.com.

Screenshots

PDFOptim4 screens
PDF Compressor-Compress PDF4 screens

Verdict

The call

PDFOptim and PDF Compressor-Compress PDF both sit at 4.7 stars, but that hides the real split: 76% of PDFOptim's written reviews are positive against 29% of PDF Compressor-Compress PDF's. PDFOptim also leads on ads (none vs shown). PDF Compressor-Compress PDF's advantage is update cadence (every 2 months vs every 5 months). On price, rating, ratings volume and in-app purchases 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 PDF Compressor-Compress PDF sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for PDFOptim against 4.6 for PDF Compressor-Compress PDF. Both are backed by a comparable volume of ratings — 292 and 146 respectively. Written reviews are what separate them: 76% of PDFOptim's written reviews are positive against 29% of PDF Compressor-Compress PDF's.

UpkeepUpdate frequency

PDFOptim ships an update every 5 months, PDF Compressor-Compress PDF every 2 months. The most recent releases landed on September 21, 2026 and September 29, 2026 respectively.

Scorecard3 real differences · 7 level
PDFOptim versus PDF Compressor-Compress PDF: the parameters behind the verdict, then further details
ParameterPDFOptimPDF Compressor-Compress PDF
PriceFreeFree
Rating4.7 (292 ratings) — better4.6 (146 ratings)
Positive reviews75.6% of reviews — better28.6% of reviews
Number of ratings292 — better146
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.615.0 — better
Further details — not scored
Size8 MB30 MB
Age rating4+4+
DeveloperRootRise Technologies Pvt. Ltd.EclixTech UK LTD

Customer experience

PDFOptim

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

PDF Compressor-Compress PDF

All ratings146 ratings
Positive91.1%
Neutral1.4%
Negative7.5%
Written reviews7 reviews
Positive28.6%
Neutral0.0%
Negative71.4%

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

PDF Compressor-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
4 purchases

PDF Compressor-Compress PDF

Subscriptions4
  • Weekly Subscription$4.997 Days
  • Monthly Subscription$9.991 Month
  • Yearly Subscription$19.991 Year
Show 1 more
  • Yearly Subscription$39.991 Year

Questions

Is PDFOptim free?
PDFOptim is free to download, with in-app purchases available.
Is PDF Compressor-Compress PDF free?
PDF Compressor-Compress PDF is free to download, with in-app purchases available.
Which has better reviews, PDFOptim or PDF Compressor-Compress PDF?
PDFOptim is rated higher. PDFOptim averages 4.7 out of 5 from 292 ratings, while PDF Compressor-Compress PDF averages 4.6 from 146 ratings.
Do PDFOptim or PDF Compressor-Compress PDF have ads?
PDF Compressor-Compress PDF shows ads; PDFOptim does not.
Which is updated more often, PDFOptim or PDF Compressor-Compress PDF?
PDFOptim ships an update every 5 months, and PDF Compressor-Compress PDF every 2 months. Most recently, PDFOptim was updated on September 21, 2026 and PDF Compressor-Compress PDF on September 29, 2026.

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