Compress a PDF on iPhone

What this looks like

Compressing a PDF on iPhone used to mean emailing the file to yourself and opening it on a computer. PDF JustFit moves the whole task onto the phone, including the case where the file arrives as an email attachment.

• A PDF on your iPhone is too large to send or upload.
• You do not have access to a desktop computer.
• The file arrived as an email attachment and needs to go back out smaller.
• You want to reduce a scan without a separate converter app.

Why it happens

• A scanned or image-heavy document saved to Files.
• An attachment received in Mail that exceeds a send limit.
• A document exported from another app at high quality.
• A file that needs to pass through a size-limited portal.

How to fix it with PDF JustFit

1. Choose your entry point

   Open PDF JustFit and pick the PDF from Files, or send the PDF to PDF JustFit from another app's share sheet.

2. Enter a target size

   Type the size you need, or choose one of the four presets.

3. Choose a mode

   Smart keeps text selectable; Maximum produces the smallest possible file.

4. Compare

   Check the original and the result side by side, page by page.

5. Export

   Save the compressed PDF, and find it later in History.