How to Reduce PDF File Size for Email and Sharing

Large PDF files are a common headache — email providers often cap attachments at 25MB, and slow uploads waste time. Here's what actually makes PDFs large, and how to bring the size down.

What makes a PDF large?

Most bloated PDFs are large because of embedded images that are higher resolution than needed for on-screen viewing, or because scanning software embeds each page as a full-resolution image instead of compressed text and vector graphics.

How to compress a PDF in your browser

1. Open the Compress PDF tool.
2. Upload your PDF.
3. Download the compressed result.

Compression restructures the PDF's internal objects for a smaller file size. Results vary by document — PDFs with large embedded images benefit the most from image-focused compression, while text-only PDFs may see smaller size reductions since there's less to optimize.

Other ways to shrink a PDF

• Split it. Use the Split PDF tool if you only need to send certain pages instead of the whole document.
• Strip metadata. Remove unnecessary metadata with the PDF Metadata Remover — author names, software versions, and timestamps add up across many files.
• Recheck your source images. If you're the one creating the PDF from photos, compress the images first with the Image Compressor before converting them.

Quick checklist before sending a large PDF

• Do I actually need every page, or can I split out just the relevant ones?
• Are the embedded images higher resolution than the recipient needs?
• Does the file still contain metadata I don't want to share?