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

A PDF that is too big to attach, upload, or share stops you on an iPad — an email bounces, a portal rejects the file, or a scanned contract fills your iCloud storage. You do not need a compressor app to fix it.

Here is how to compress a PDF on your iPad for free, using the built-in app or in Safari.

Compress a PDF with the built-in Preview app

On recent iPadOS versions, the Preview app that ships with the iPad can export a PDF at a smaller size:

1. 1Open the PDF in the Preview app.
2. 2Tap the Actions (…) button next to the file name, then tap Export.
3. 3Choose PDF and use the size slider to reduce the file.
4. 4Save the compressed copy back to the Files app.

The exact wording varies by iPadOS version, but the export screen always offers a size control. This creates a new file and leaves your original at full quality.

Compress a PDF on iPad in Safari (more control)

For finer control over quality, a browser-based compressor runs in Safari with no app to install and processes the file on your iPad:

1. 1Open the Compress PDF tool in Safari on your iPad.
2. 2Tap to choose a file, then select your PDF from the Files app or iCloud Drive.
3. 3Pick a compression level — light keeps text and images crisp, while heavier compression produces the smallest file.
4. 4Tap compress and review the new file size.
5. 5Download the smaller PDF back to your device and share it from the Files app.

Which compression level should you pick?

• Light for documents you will print or zoom into — text stays sharp and photos keep their detail
• Recommended for screen viewing, email, and most uploads — usually 40–80% smaller with no visible difference
• Heavy when you need the absolute smallest file and do not need full image quality

If compression is not enough

A heavily scanned or photo-filled document can stay large even at maximum compression. Re-scan at a lower resolution, split the file and send only the pages the recipient needs, or run OCR to replace scanned images with selectable text — then a light compression polish is usually all that is left.