How to Compress a PDF for Email

Quick answer: Drop your PDF into Compress PDF, pick "screen" quality, then download. Most 25 MB PDFs come out under the 20 MB Gmail / 20 MB Outlook attachment cap in a single pass.

Steps

Open the free Compress PDF tool.
Drop your file in. Pick "screen" or "ebook" quality — both keep text crisp.
Click Compress, wait a few seconds, then download. Attach the smaller file to your email.

Everything runs in your browser — your PDF never leaves your device.