Gmail blocks attachments over 25 MB, Outlook often caps at 20 MB and corporate mail at 10 MB. Compressing your PDF is the fastest fix — one second, no signup.
If a file is still too large after compression, split it into two PDFs and send them as separate emails.
Frequently asked questions
What is Gmail's attachment limit?
25 MB per message.
What if the file is 100 MB?
Split it first, then compress each part.
Is a cloud link better than compressing?
Links can expire and recipients may lack access; a compressed attachment is more reliable.
Do it in the full tool
Open Compress PDF for all options, or jump straight to another step below.