Compress a PDF

Reduce the file size of a PDF by downsampling embedded images. Text and vectors stay sharp.

The Compress tool reduces a PDF's file size by shrinking embedded images. Text, fonts and vector graphics are untouched — the output looks identical to the original at normal viewing sizes.

How to compress

1. With the PDF open, tap ••• and choose Reduce File Size (number 3 in the picture). You can also start from the Tools tab › Compress PDF.

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2. Pick a compression level: - Smallest (72 dpi images) — smallest file, for on-screen viewing. - Balanced (110 dpi) — good for sharing and email. - Sharpest (150 dpi) — keeps images clearer, for printing.
3. Tap Reduce File Size. Only images are recompressed — text, vector graphics, links and form fields stay intact.

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Tips

• Compression only helps if the PDF contains images (photos, scans). A PDF with only text and vector graphics will not shrink much.
• Use Smallest or Balanced for documents you will share by email or message.
• Use Sharpest for anything that may be printed.
• The original file is never modified — the compressed result is always a new file.