iPhoneiOSFiles AppUpdated May 1, 2026by Yee Wee

How to Compress a PDF on iPhone Using the Files App

The iPhone Files app can open, view, and organise PDFs — but it can't compress them. The fastest way to compress a PDF on iPhone is through Safari using a browser-based tool. No App Store download, no sign-in. The compressed file saves directly into your Files app, ready to share or upload.

Step-by-Step: Compress PDF on iPhone

Open Safari on Your iPhone

Open the Safari browser — not Chrome or Firefox. Safari on iOS integrates best with the Files app for downloading files. Go to shrinkpdf.fyi.

Tap "Choose PDF File"

Tap the upload button. iOS will show you options: Files, iCloud Drive, or other connected storage. Tap Files to browse your local storage, or iCloud Drive if your PDF is synced there.

Navigate to Your PDF

In the file picker, browse to your PDF. Common locations: Downloads (files received via Safari), On My iPhone (local storage), or a specific app folder like WhatsApp or Mail.

Choose Compression Level

Select Balanced for most documents. Select Maximum for scanned files or when you need the smallest possible size for uploading to a portal.

Download the Compressed PDF

Tap Download. A small download indicator appears in the Safari address bar (top right). Tap it to see the download progress. When complete, tap the file to open it, or tap Downloads to see all recent downloads.

Find It in the Files App

Open the Files app → On My iPhone → Downloads. Your compressed PDF is there. Long-press it to rename, move, share, or delete it.

Everything stays on your iPhone

ShrinkPDF processes your PDF entirely within Safari — the file never leaves your device. This is important when compressing sensitive documents like bank statements, ICs, or payslips before sending them via WhatsApp or email.

Finding Your PDF in the Files App

iOS stores files from different sources in different locations. Here's where to look:

Files received via WhatsApp: Files app → On My iPhone → WhatsApp → Documents
Files received via email (Mail app): Tap the attachment in Mail → tap the share icon → Save to Files → choose a folder. Then find it in Files.
Files downloaded via Safari: Files app → On My iPhone → Downloads
Files in iCloud: Files app → iCloud Drive
Files from Google Drive: Open the Google Drive app, find the file, tap the three dots → Open in → Files app (or download first)

If you can't find the PDF in the file picker

Some apps save files in their own private storage, which isn't accessible from the Files picker. Try: open the file in its source app (e.g. WhatsApp), tap Share → Save to Files, choose a folder. It'll then appear in Files when you go back to ShrinkPDF.

Sharing the Compressed PDF After Download

Once the compressed PDF is in your Files app Downloads folder, you can share it directly:

WhatsApp: Open WhatsApp → chat → paperclip icon → Document → browse Files → select compressed PDF
Email: Open Mail → compose → paperclip icon → browse Files → select the file
Upload to portal: Open Safari → go to the portal → tap the file upload field → Files → select the compressed PDF
AirDrop to Mac: Long-press the file in Files → Share → AirDrop → select your Mac

Compressing PDFs Stored in iCloud Drive

If your PDF is in iCloud Drive and not downloaded to your phone yet:

Open the Files app and go to iCloud Drive
Find the PDF — if it shows a cloud icon, tap it to download it first
Once downloaded (no cloud icon), go to ShrinkPDF in Safari
Tap Choose PDF File → iCloud Drive → navigate to the file
Compress, download, and the compressed file saves to On My iPhone → Downloads

✓ Compress PDF on iPhone — Free, Private, Fast

Open in Safari. No App Store. No account. Your files stay on your device.

🗜️ Compress My PDF Now

Frequently Asked Questions

Can I compress a PDF on iPhone without downloading an app? ▼

Yes. Open Safari on your iPhone, go to shrinkpdf.fyi, upload your PDF, compress it, and download the result — all within Safari. The compressed file saves to your Files app Downloads folder. No App Store download needed.

Where does the compressed PDF save on iPhone? ▼

When you download a file in Safari on iPhone, it saves to the Files app → On My iPhone → Downloads. You can then move it to any folder, share it, or upload it directly from there. If you use iCloud Drive, Safari downloads may go to iCloud Drive → Downloads instead, depending on your settings.

Can the Files app compress PDFs on its own? ▼

No. The iOS Files app can view, organise, rename, and share PDFs, but it doesn't have a built-in compression feature. For compression, you need a separate tool — either a browser-based tool like ShrinkPDF (in Safari) or a third-party app from the App Store.

Should I use Safari or Chrome on iPhone for ShrinkPDF? ▼

Either works, but Safari integrates more smoothly with the iOS Files app and the download manager. When you download in Safari, the file appears natively in Files → Downloads. Chrome on iOS downloads to its own internal folder, which is slightly harder to access from other apps.

Why does my iPhone PDF look large after scanning with the Notes app? ▼

The Notes app scans PDFs at high resolution by default — typically 200–300 DPI with minimal compression — resulting in files of 1–5MB per page. A 5-page scanned document can easily be 15–20MB. Compressing with ShrinkPDF's Maximum setting typically brings this down to 2–4MB, which is much more practical for sharing.