How to Shrink a PDF Small Enough for Email Attachments
Guide · PDF Tools
Most email providers cap attachment size somewhere between 20 and 25MB, and a PDF with a handful of high-resolution scanned pages or photos can quietly sail past that limit without looking unusually large when you're just glancing at it in a file browser.
Check the size before you try to send it
A quick look at the file's size in your file manager tells you immediately whether you're dealing with a compression problem or something else (like the email service being down) if a send fails — don't assume the first email failure is a connection issue if the file is sitting close to or over the limit.
Compress first — it's usually enough
Running the PDF through a compressor before anything else typically solves the problem outright for documents with embedded images, since images are almost always the source of the bulk. Try moderate compression first and check the file still looks acceptable before going further.
If it's still too big, remove what you don't need
If compression alone doesn't get you under the limit, check whether every page is actually necessary for this specific recipient — splitting out just the relevant pages, rather than sending the entire original document, is often the fastest remaining option.
When a cloud link is genuinely the better answer
If the document needs to stay at full, uncompressed quality (a printable proof, for example) and it's still too large even after reasonable compression, a shared cloud storage link is the right answer rather than compressing past the point where quality actually suffers.