Comparison

Slim PDF vs Shrink PDF

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

Head to head
About

Slim PDF

Features
Read full description

Slim PDF makes oversized PDFs smaller in seconds, directly on your iPhone or iPad. Your PDF files are processed on-device and are never uploaded to a document-processing server. COMPRESS FOR EMAIL AND UPLOADS Choose Email, WhatsApp, Web Upload, or a custom target size. Slim PDF automatically works toward the limit you select. SEE EXACTLY WHAT YOU SAVED Compare the original and compressed sizes, preview the result, then share it or save it to Files. BATCH COMPRESS Compress several PDFs in one run instead of processing them individually. MERGE AND SPLIT Combine multiple PDFs or divide a large document into smaller files without switching apps. PRIVATE PDF PROCESSING PDF compression, merging, and splitting happen on your device. No account is required, and your PDF contents are not uploaded for processing. SLIM PDF PRO Unlock unlimited compression, all compression presets, target-size tools, batch processing, merge and split, and biometric app lock. Monthly, annual, and lifetime options are available. Questions or feedback? Contact support from Settings inside the app. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vRznAH_B9JavfvM4hbre2eIJYm1aBoXo02aw5T7ccS3XMh7VqV1LT3kqyLbojMguCsW0vDy08MUsa9q/pub

About

Shrink PDF

Features
Read full description

"File is too large." Seeing that right before a deadline is a special kind of stress. Shrink PDF makes heavy PDFs small enough to attach to an email. Pick a PDF, pick how much to compress, done. ◆ See exactly how much smaller it got ・The size before and after sit side by side, in big clear numbers ・In one measured example, 10.3 MB became 1.0 MB (about 90% smaller) ・How much you save depends on what is inside your PDF ◆ Three compression levels, all included ・For email — when it just has to be small ・Standard — a balance of size and appearance ・High quality — stays sharp, still lighter ・None of them are locked behind a purchase. You get all three ◆ Nothing is sent to a server ・Compression happens entirely on this device ・Your PDF is never uploaded anywhere ・Safe for contracts, invoices, scanned IDs and anything else you would rather not hand to a website ・Works with no internet connection at all ◆ Made for moments like ・A form that only accepts files up to 10 MB, and yours is bigger ・An email that bounced back because the attachment was too heavy ・Scanned paperwork that somehow takes several MB per page ・A university or workplace portal that refuses your upload ・A contract or invoice you need to send a client, but it is too large 【How the compression works】 This app rebuilds each page as an image to bring the size down. Because of that, text in the compressed PDF can no longer be selected, copied or searched. Your original file is left untouched, so you can keep both and use whichever fits. 【About Premium】 The app is free to use and the compression features are not limited in any way. The free version shows ads. Premium — an auto-renewing monthly subscription — removes all ads from the app. ・Payment is charged to your Apple ID account at confirmation of purchase ・The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period ・Manage or cancel in your device Settings → Apple ID → Subscriptions ・There is no free trial period Privacy Policy: https://hecuhecu.github.io/apps/pdf-compress/privacy/ Terms of Use: https://hecuhecu.github.io/apps/pdf-compress/terms/

Screenshots

Slim PDF4 screens
Shrink PDF4 screens

Verdict

The call

The clearest difference is ads: Slim PDF at none against Shrink PDF's shown. Shrink PDF's advantage is update cadence (every 8 days vs every 3 weeks) and iOS requirement (15.0 vs 17.6). On price, 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. Slim PDF sells 3 in-app purchases, starting at $7.99 per month and Shrink PDF sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Slim PDF ships an update every 3 weeks, Shrink PDF every 8 days. The most recent releases landed on October 28, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 3 level
Slim PDF versus Shrink PDF: the parameters behind the verdict, then further details
ParameterSlim PDFShrink PDF
PriceFreeFree
Update frequencyEvery 3 weeksEvery 8 days — better
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.0 — better
Further details — not scored
Size20 MB39 MB
Age rating4+4+
DeveloperRUEBEN ANSOLIWEN AKANKOBATENGhiroki kawamura

In-app purchases

3 purchases

Slim PDF

Subscriptions2
  • All access monthly$7.991 Month
  • All access yearly$29.991 Year
One-time1
  • All access Lifetime$89.99
2 purchases

Shrink PDF

Subscriptions1
  • Ad-Free PDF Shrinking$1.991 Month
One-time1
  • Ad-Free Forever$17.99

Questions

Is Slim PDF free?
Slim PDF is free to download, with in-app purchases available.
Is Shrink PDF free?
Shrink PDF is free to download, with in-app purchases available.
Do Slim PDF or Shrink PDF have ads?
Shrink PDF shows ads; Slim PDF does not.
Which is updated more often, Slim PDF or Shrink PDF?
Slim PDF ships an update every 3 weeks, and Shrink PDF every 8 days. Most recently, Slim PDF was updated on October 28, 2026 and Shrink PDF on October 29, 2026.

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