How to compress a PDF for email without uploading it

Most email providers allow attachments somewhere around 20 to 25 MB, and many workplace systems are stricter. PDFs often exceed that limit because each page contains large scanned images, high-resolution photos, or embedded design assets.

Text-heavy PDFs are usually already compact. Scanned documents are different: every page is essentially a picture. Compressing those files means reducing how much image data is stored while keeping the document readable.

Start by making a copy of the original PDF. Compression can reduce image sharpness, so keeping the original gives you a clean fallback.

Open the compression tool, add the copied PDF, and export the smaller version. After export, check two things before sending: file size and readability. Zoom into signatures, stamps, small print, tables, and scanned IDs if they exist.

If the PDF is large because it contains many unrelated documents, splitting it may be better than compressing it. If only a few pages are needed, extract those pages instead of sending the whole file.

For legal, financial, or medical paperwork, prioritize readability over tiny file size. A slightly larger attachment is better than a document that the recipient cannot verify.