If Gmail will not let you attach a PDF, the message is almost always over the allowed attachment size. Compressing it is usually enough to send it on the email, without a link.
Why Gmail rejects the attachment
The cap is for the whole message: PDF, other photos and the body count together. A scan of a few pages or a PDF with high-resolution images overshoots easily. That is not a Gmail bug; it is the mail attachment limit.
Compress the PDF for email
- Check the PDF’s weightOn the computer or phone, see how large the file is before you attach it.
- Compress if it is near the capOpen the compress PDF tool, upload it and download the lighter version.
- Attach and sendAdd the PDF with the paperclip. If Gmail still offers Drive, the file is still over the message limit.
When to squeeze compression further
- The PDF is still near 25 MB after the first pass.
- You are attaching several files in the same message.
- The recipient asks for a lighter file because their mailbox or network is tight.
If the goal is not a Gmail attachment but a specific number, such as getting it under 2 MB, compress and check the file weight on your device. To keep visible quality, follow how to reduce a PDF’s size without losing quality.
If it still will not fit
- Merge and then compress the result if they are several loose documents.
- For scans, digitise at 200–300 dpi; 600 dpi almost never helps and inflates the weight.
- For truly large files, send a Google Drive link instead of the attachment.