āYahoo Mail allows attachments up to 25MB.Yahoo Help ā
āIf a Gmail attachment exceeds 25MB, Gmail automatically converts it to a Google Drive link.Google Help ā
āAttachments are base64-encoded in transit, which adds ~33% overhead ā a 25MB file becomes ~33MB on the wire. Email servers measure the encoded size.
ā Frequently Asked Questions
What is the maximum PDF size I can send via email?+
Gmail and Yahoo Mail allow up to 25MB. Outlook.com allows up to 20MB. To be safe across all platforms, keep attachments under 20MB.
What happens if my PDF is too large for Gmail?+
Gmail automatically removes the attachment and inserts a Google Drive link in its place. The recipient can download it from Drive.
Does compressing a PDF affect its content?+
No. Text, fonts, and page layout are preserved. Only embedded image quality may be slightly reduced.
What should I do if I can't compress the PDF small enough?+
Use Google Drive, OneDrive, or Dropbox to share a link instead of attaching the file directly.