Smart PDF Compressor Icon Smart PDF Compressor
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Features Presets How It Works Guides FAQ Support Privacy Policy Terms of Use
100% On-Device · Apple Privacy: Data Not Collected

Shrink PDFs by up to 95%.
Directly on your iPhone & iPad.

Smart PDF Compressor reduces file sizes with intelligent image downsampling and quality optimization. Your files never leave your device — no cloud uploads, no account, no subscriptions.

Real document test: An 8-page scan shrunk from 5.6 MB to 669 KB (-88.1% smaller) while remaining sharp and legible.

Download on the App Store

Free on the App Store • Universal iPhone & iPad App • Requires iOS 18.0+

Smart PDF Compressor showing 88.1% size reduction from 5.6 MB to 669 KB
100% On-Device Privacy Zero network calls. Files are processed locally and never uploaded anywhere.
-95% Max File Reduction Intelligent image downsampling via Apple's native vImage & PDFKit frameworks.
3 Smart Presets Light, Standard, and Maximum clarity levels, plus granular manual control.
$0 Free Forever No accounts, no subscriptions, no ads, and no locked features.
Engineered for iOS

Fast, honest compression built on native Apple technologies

Smart PDF Compressor utilizes Apple's Accelerate framework and PDFKit to achieve rapid local compression without degrading document legibility.

Clarity Presets & Pro Control

Tailored compression for every destination

Choose between three carefully calibrated presets, or take full manual control over image resolution, JPEG quality, and grayscale conversion.

  • Light Preset: 85% image quality, 200 DPI max — ideal for archival and printing.
  • Standard Preset: 60% quality, 150 DPI — the balanced sweet spot for email attachments.
  • Maximum Preset: 35% quality, 100 DPI — for strict job, visa, or portal upload limits.
  • Custom Sliders: Fine-tune resolution from 72 to 300 DPI and enable Grayscale with one tap.
Smart PDF Compressor preset and slider settings screen
Smart Analysis & Honest Results

Automatic detection of scanned vs. digital PDFs

Scanned PDFs consist of large image pages and yield massive savings when downsampled. In contrast, digital text documents are already compact. The app detects document type instantly:

  • Scanned Documents: Automatically targeted for maximum image optimization.
  • Original Kept: If compressing would save less than 2%, the app keeps your original file untouched and labels it "Original kept".
  • Side-by-Side Verification: Inspect original vs. compressed pages before saving.
Side by side PDF page verification preview
Document Library & History

Organized file history with swift sharing

Every compressed document is safely saved to your device library. Search by filename, rename with a swipe, preview full documents, or export multiple files in a single tap.

  • Date Grouping & Search: Instantly locate previous documents by name.
  • Batch Compression: Select multiple files at once with real-time per-file progress tracking.
  • Native Share Sheet: Share via Mail, AirDrop, Files, WhatsApp, or ZIP archive.
Smart PDF Compressor document library and history
Compression Presets

Calibrated presets for every use case

Every preset balances file size reduction against visual readability, ensuring crisp small print and clear signatures.

Light

Best quality · Sharpest text
Resolution: Max 200 DPI JPEG Quality: 85% Color: Preserves full color

Recommended when you need to print the document, keep fine architectural drawings crisp, or preserve legal contracts with tiny footnotes.

Recommended

Standard

Balanced · Great for email
Resolution: Max 150 DPI JPEG Quality: 60% Color: Preserves color

The sweet spot for everyday sharing. Drastically cuts file size while retaining excellent clarity on phone, tablet, and desktop screens.

Maximum

Smallest file · Strict portals
Resolution: Max 100 DPI JPEG Quality: 35% Grayscale: Optional single-tap

Designed for strict upload limits (e.g. 2 MB government portals, job applications, or insurance claim forms) where every kilobyte counts.

Simple & Seamless

How to compress a PDF in 4 steps

No accounts to create, no file size queues, and no waiting for uploads.

1

Select Document

Tap + to pick one or more PDFs from the Files app, iCloud Drive, or receive them directly via the iOS Share Sheet.

2

Choose Preset

Select Light, Standard, or Maximum, or tap custom settings to choose exact DPI and grayscale mode.

3

Compress Instantly

Tap Compress PDF. Native Swift and vImage process pages on device in seconds with live progress feedback.

4

Preview & Share

Inspect before/after savings, check page clarity, and share via Mail, Messages, AirDrop, or save back to Files.

Step-by-Step Guides

Practical PDF guides for iPhone users

Clear, practical tutorials on solving everyday document file size problems on iOS.

Privacy & Security

How to compress a PDF on iPhone without uploading it

Compare Apple's Preview options with dedicated on-device compression. Learn why offline processing protects confidential tax returns, medical files, and signed agreements.

Read guide Email Attachments

How to make a scanned PDF small enough to email from iPhone

Why phone scans blow up into massive 20+ MB files, what Mail Drop does, and how adjusting DPI and grayscale gets attachments under strict mailbox limits.

Read guide
Got Questions?

Frequently Asked Questions

Everything you need to know about Smart PDF Compressor for iOS.

Does Smart PDF Compressor upload my PDF to a server?

No, never. Every PDF is compressed directly on your iPhone or iPad using Apple's built-in frameworks. The app operates 100% offline and makes zero network requests. Under Apple's App Store privacy nutrition label, Smart PDF Compressor is classified as Data Not Collected.

How much smaller will my PDF get?

Up to 95% smaller, depending on document contents. Scanned PDFs (where each page consists of an image photograph of paper) shrink the most — an 8-page scan in our benchmark dropped from 5.6 MB down to 669 KB (-88.1%). Digitally generated PDFs with pure vectors or small embedded fonts shrink less.

What happens if compression doesn't reduce the file size?

If compression produces a file that is not significantly smaller (less than a 2% saving), the app automatically keeps your original file untouched and labels it "Original kept" in history. We never replace your file with a worse copy.

Will the compressed PDF still be readable?

Yes. Our compression algorithm uses high-quality Lanczos downsampling to preserve fine lines, text edges, and stamp details. You can compare the original and compressed files side-by-side on your screen before saving.

Can I compress several PDFs at once?

Yes! When importing documents, you can select multiple PDFs. The app queues them into a batch, showing individual progress indicators for each file.

Is Smart PDF Compressor really free?

Yes. It is free to download on the App Store with no subscription, no in-app purchases, no user registration, and no ads. It is developed by Quan Dang as a standalone utility.

Does it work natively on iPad?

Yes. Smart PDF Compressor is a native universal app for iOS and iPadOS. On iPad, it takes full advantage of the larger display with full multi-column layouts and Stage Manager support.

How do I find the correct app on the App Store?

Look for Smart PDF Compressor by developer Quan Dang, App Store ID 6757997785. Direct link: apps.apple.com/app/id6757997785.

Shrink large PDFs in seconds with complete privacy.

Download Smart PDF Compressor on your iPhone and iPad today. 100% offline, zero data collected, completely free.

Download on the App Store
App Store ID: 6757997785 • Requires iOS 18.0 or later