Skip to content
KazamTools

How to Compress a PDF on iPhone or iPad (Free, No App)

Compress a PDF on iPhone in Safari without an app: pick the file from Files, choose a compression level and save the smaller copy back to Files.

By , Founder and editor-in-chiefPublished

Compress PDFMake PDFs smaller for email and upload limits, without sending them anywhere.Split PDFCut one PDF into several files by page range, every few pages, or page by page.Delete PDF PagesRemove blank, duplicate or unwanted pages and keep the rest.

Your iPhone has no “compress PDF” button. The Files app can view, mark up, rotate and combine PDFs, but it cannot make one smaller. The quickest free fix is a browser tool: open Compress PDF in Safari, choose the file from the Files app, pick a compression level and save the result back to Files. It takes under a minute and you don’t need an App Store download or an account.

This guide walks through those steps, explains which setting to choose for which kind of PDF, and covers the tricks that work when a form or email still says the file is too big.

Why PDFs on an iPhone get so big

Most large PDFs on a phone come from one of three places:

  • Scans. Notes and the Files app can scan paper documents into PDFs. Each page is stored as a photo, often several megapixels, so a 10-page scan can be 5 to 15 MB.
  • Photos turned into PDFs. Printing or exporting camera photos to PDF keeps the full-resolution images inside.
  • Downloaded reports and brochures. These often embed high-resolution images and whole font files.

Text-only PDFs, such as a letter typed in Pages, are usually small already. Compression helps most with the first two types.

Step by step: compress a PDF in Safari

  1. Save the PDF to Files first. If it arrived as an email attachment, press and hold it, tap Save to Files, and pick a folder you will remember, such as On My iPhone > Downloads. If it is in WhatsApp, open it, tap the share icon and choose Save to Files.
  2. Open the tool. In Safari, go to Compress PDF.
  3. Choose the file. Tap the upload box. iOS shows a menu: tap Choose Files (or Browse) and select your PDF from the Files app. Do not use Photo Library; that is for images.
  4. Pick a level. Start with Recommended. If the result is still too large, go back and choose Strong.
  5. Compress and download. Tap the button and wait for the progress bar. When it finishes, tap Download. Safari asks whether to download the file; tap Download again.
  6. Find the smaller file. Tap the blue download arrow in Safari’s address bar, or open the Files app and look in Downloads. The new file has the same name with a suffix, so the original stays untouched.

The compression runs in Safari on your phone. The PDF is not uploaded to a server, which matters for bank statements, ID scans and medical letters.

If you can’t find downloads, check Settings > Apps > Safari > Downloads. That setting decides whether Safari saves to iCloud Drive or to On My iPhone.

The two settings work in different ways, and the right one depends on what is inside the PDF.

Setting What it does Best for Trade-off
Recommended Removes unused and duplicate data, keeps text and images exactly as they are Reports, forms, typed documents Scans may shrink only a little
Strong Redraws every page as a JPEG image at the resolution and quality you set Scans and photo-heavy PDFs Text can no longer be selected or searched

A useful habit: try Recommended first. If the file barely changes, the PDF is probably made of page images, and Strong is what will shrink it. Scans commonly drop by 50 to 90 percent with Strong at 100 dpi.

If you need to keep the text searchable after a strong squeeze, run the result through OCR PDF afterwards. It adds an invisible text layer back.

When the file is still too big

Government portals, job sites and university forms often cap uploads at 1 MB, 500 KB or even 200 KB. If one pass is not enough, work through these in order:

  1. Lower the dpi. With Strong, try 100 dpi, then 72 dpi. Text stays readable on screen at 100 dpi for most documents; 72 dpi is a last resort for scans you only need to view.
  2. Lower the quality. Drop JPEG quality step by step (70, 60, 50). Check one page after each try.
  3. Remove pages you don’t need. A bank might only want the first page of a statement. Delete PDF pages cuts the rest, and fewer pages means fewer bytes.
  4. Split it. If a portal allows several uploads, use Split PDF to send the file in parts.
  5. Hit an exact target. For a fixed limit, the presets compress PDF to 1 MB, to 500 KB, to 200 KB and to 100 KB aim for that size.

A quick sum helps you choose settings for a hard limit. Divide the limit by the number of pages. A 1 MB limit on a 10-page scan gives about 100 KB per page, which Strong at 100 dpi usually meets. A 200 KB limit on 10 pages leaves only 20 KB per page, which is too little for clear text. For that, cut pages first.

Scan smaller in the first place

If you are about to scan a document on your iPhone, you can avoid a big file:

  • Scan in black and white or greyscale when the page is just text. In the Notes scanner, tap the filter button and choose Greyscale or Black & White. Colour scans are much larger.
  • Crop tightly. Let the scanner detect the page edges so you don’t save the table around it.
  • Scan only what is asked for. An application that wants your ID front and back does not need a blank third page.

Emailing a big PDF instead

If the PDF is for email rather than an upload form, you might not need to compress it. When an attachment is too large, the iPhone Mail app offers Mail Drop. It uploads the file to iCloud and sends a download link instead. Apple says Mail Drop handles attachments up to 5 GB, and the link lasts 30 days (Apple Support).

Mail Drop is handy for sending, but many forms will not accept a link. For uploads you still need a smaller file.

Troubleshooting

The download button does nothing. Make sure you’re in Safari, not an in-app browser such as the one inside Instagram or Gmail. Tap the share icon and choose Open in Safari.

The file got bigger or stayed the same. Some PDFs are already well compressed. The tool keeps your original and tells you when the result is not smaller. Try Strong instead.

The PDF is password-protected. Compression needs to read the file. If you know the password, remove it with Unlock PDF, compress, then add protection back with Protect PDF.

Text looks blurry after Strong. Raise the dpi to 150 or the quality to 80. You are trading size for sharpness, so find the lowest setting that still reads well.

For other devices, see the full guide to compressing a PDF on Mac, Windows and Android.

FAQ

Can I compress a PDF on iPhone without an app?

Yes. iOS has no built-in compression, but a browser tool works in Safari with files from the Files app. Nothing needs installing, and with Compress PDF the file stays on your phone.

Does compressing a PDF on iPhone reduce quality?

The Recommended setting is lossless, so text and images look exactly the same. The Strong setting converts pages to JPEG images, which lowers image quality and makes text unselectable. Check a page before you send it.

How do I make a PDF under 1 MB on my iPhone?

Use Strong compression at 100 dpi and about 60 percent quality, then check the size in Files (press and hold the file and tap Get Info). If it is still too big, delete unneeded pages or use the 1 MB preset.

Where does Safari save the compressed PDF?

In the Downloads folder in the Files app by default, either in iCloud Drive or On My iPhone. You can change the location in Settings > Apps > Safari > Downloads.