Comparison

PDF Compressor vs UnderLimit

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

Head to head
About

PDF Compressor

Easily reduce PDF file sizes, split documents into separate pages, and merge multiple files into one. Offers preset compression levels or custom target sizes for your documents.

Highlights
  • Compress PDFs to any size
  • Split documents into pages
  • Merge multiple PDFs
  • Customizable compression levels
  • Offline merging and splitting
  • Privacy-focused file handling
Features
Read full description

Shrink PDFs to any size without the fuss. PDF Compressor makes it easy to reduce PDF file sizes, split documents, and merge files together โ€” all on your iPhone. COMPRESS Quickly compress any PDF with one tap. Choose a preset level like Balanced, light, strong or type in a target file size down to the exact MB or KB you need. We use advanced algorithms in our servers to compress PDFs. PRIVACY FIRST Your files are automatically removed from our servers after 2 hours. You can also head to Settings โ†’ My Data to delete your files on demand. SPLIT & MERGE โ€” FREE Split a PDF into separate pages or extract exactly what you need, with visual page previews. Merge multiple PDFs into a single file in seconds. Both features are completely free to use. Merging and splitting PDFs happen offline and in seconds. FREE & PRO โ€ข Free: compress PDFs up to 10 MB, up to 20 pages total. Merge & split unlimited PDFs. โ€ข Pro: up to 50 MB per PDF, unlimited compression, batch compress multiple files at once with per-file settings No fuss. Just smaller PDFs. Privacy Policy - https://compresspdftoanysize.com/privacy Terms of service - https://compresspdftoanysize.com/terms

About

UnderLimit

Features
Read full description

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 โ€ข Compress photos to a target file size โ€ข Reduce image size in KB or MB โ€ข Keep the best quality possible โ€ข Quickly prepare images for uploads, forms, email, and sharing PDF COMPRESSION โ€ข Reduce PDF file size โ€ข Choose the maximum size you need โ€ข Prepare PDFs for upload limits and attachments โ€ข 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 โ€ข Online forms and portals โ€ข Email attachments โ€ข Applications and document submissions โ€ข Websites with maximum upload sizes โ€ข Reducing photos before sharing โ€ข Compressing PDFs for size-restricted uploads Stop guessing compression levels. Choose the size you need and make your file fit the limit.

Screenshots

PDF Compressor4 screens
UnderLimit4 screens

Verdict

The call

The clearest difference is update cadence: UnderLimit at every 2 days against PDF Compressor's every 2 weeks. PDF Compressor's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. PDF Compressor sells 3 in-app purchases, starting at $9.99 per 7 days and UnderLimit sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PDF Compressor ships an update every 2 weeks, UnderLimit every 2 days. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.

Scorecard2 real differences ยท 6 level
PDF Compressor versus UnderLimit: the parameters behind the verdict, then further details
ParameterPDF CompressorUnderLimit
PriceFreeFree
Positive reviews100.0% of reviewsโ€”
Update frequencyEvery 2 weeksEvery 2 days โ€” better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumโ€”
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS13.0 โ€” better17.0
Further details โ€” not scored
Size49 MB4 MB
Age rating4+4+
DeveloperAmal PaulALESSANDRO VINCENZO DEL BALZO

In-app purchases

3 purchases

PDF Compressor

Subscriptions3
  • Weekly Access3 Days trial$9.997 Days
  • Monthly Access3 Days trial$14.991 Month
  • Yearly Access3 Days trial$39.991 Year
1 purchases

UnderLimit

One-time1
  • UnderLimit Unlimited$2.99

Questions

Is PDF Compressor free?
PDF Compressor is free to download, with in-app purchases available.
Is UnderLimit free?
UnderLimit is free to download, with in-app purchases available.
Do PDF Compressor or UnderLimit have ads?
Neither PDF Compressor nor UnderLimit shows ads.
Which is updated more often, PDF Compressor or UnderLimit?
PDF Compressor ships an update every 2 weeks, and UnderLimit every 2 days. Most recently, PDF Compressor was updated on October 31, 2026 and UnderLimit on October 24, 2026.

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