The basic steps: attach and send
To send a PDF by email, you open your email program, start a new message, add the PDF as an attachment, and send it. The attachment button is usually a paperclip icon in the compose window. Click it, find the PDF file on your computer, select it, and it will appear in the attachment field. Then address the email and send as normal.
The PDF stays as a file — the person who receives it can open it, read it, print it, or save it to their own computer. They do not need special software beyond a PDF reader, which comes built into most computers and phones.
The time it takes to send depends on the file size and your internet speed. A small PDF (under 5 MB) usually sends in seconds. Larger files take longer, and some email services reject attachments over a certain size — often 25 MB or 50 MB depending on the provider.
Key Takeaways
- Click the attachment button (usually a paperclip) in your email compose window, select the PDF from your computer, and send the message normally.
- Most email services allow attachments up to 25 MB or 50 MB, so very large PDFs may need to be sent through a file-sharing service instead.
- The person receiving the email can open the PDF on any device without needing special software beyond a standard PDF reader.
- If you do not see an attachment button in your email, look for a menu labeled "Insert," "Attach," or a three-dot options menu.
Finding the attachment button in different email services
Gmail shows a paperclip icon below the compose box on the left side. Click it and a file browser opens. Outlook and Outlook.com show the paperclip in the toolbar at the top of the compose window. Yahoo Mail has a paperclip icon in the formatting toolbar. Apple Mail on Mac and iPhone has an attachment button that looks like a paperclip in the compose area.
If you cannot find the button, look for a menu labeled "Insert" or "Options" — some email services hide the attachment feature there. On mobile phones, the attachment button is often in a menu accessed by tapping a plus sign or three horizontal lines.
Once you click the attachment button, your device opens a file browser. Navigate to the folder where your PDF is saved, select it, and click "Open" or "Select." The file name will appear in the attachment field, and you can add more files the same way before sending.
What to do if the PDF is too large to attach
If your email service rejects the file because it is too large, you have two main options: compress the PDF or use a file-sharing service. Compressing reduces the file size by lowering image quality slightly, which works well for documents that do not need to be printed at high quality.
To compress a PDF on Windows, right-click the file, select "Send to," and choose "Compressed (zipped) folder." On Mac, right-click and select "Compress." This creates a smaller version you can then attach. Many online tools also compress PDFs — search "compress PDF online" — though this means uploading your file to a third-party website.
For very large files or when you need to send multiple PDFs, file-sharing services like Google Drive, Dropbox, or OneDrive work better. Upload the PDF to the service, share a link with the recipient, and they can read it directly. This avoids email size limits entirely and lets you track whether they opened the file.
Attaching PDFs on phones and tablets
On an iPhone or iPad, open the Mail app and start a new message. Tap the compose area, then look for a paperclip icon or a plus sign. Tapping it opens options to add an attachment. Select "Files" or "Documents," navigate to where your PDF is stored (usually in Files, iCloud Drive, or an app like Dropbox), and select the PDF.
On Android phones, open Gmail or your email app and start a new message. Tap the paperclip icon, select "Attach file," and choose the PDF from your device's file manager or cloud storage. The process is similar across most Android email apps, though the exact menu location varies slightly by manufacturer.
Mobile email apps sometimes limit attachment size more strictly than desktop versions, so if a file fails to send on your phone, try sending it from a computer instead. You can also use a file-sharing link as a workaround — upload the PDF to Google Drive or Dropbox and share the link in the email body instead of attaching the file itself.
Making sure the recipient can open the PDF
PDFs are designed to look the same on any device, so the recipient will see exactly what you see. They do not need to install anything — every computer, phone, and tablet has a built-in PDF reader. If they try to open the attachment and nothing happens, they may need to update their device or use a different app, but this is rare.
If the PDF contains forms that need to be filled out, the recipient can usually type directly into the form fields if you created it properly. If the form does not allow typing, they can print it and fill it by hand, or use free online tools to add text to the PDF.
To avoid confusion, include a brief note in the email explaining what the PDF is and what the recipient should do with it. For example: "Here is the contract we discussed — please review and let me know if you have questions" is clearer than sending an attachment with no context.
Sending PDFs securely
Email is not encrypted by default, so anyone with access to your email account or the recipient's account could potentially see the attachment. If the PDF contains sensitive information like financial records, medical documents, or passwords, consider using a more find method.
Some email services offer encryption options. Gmail has a "Confidential mode" that lets you set an expiration date on the message and prevent the recipient from downloading or printing the attachment. Outlook has similar features. To use these, look for a lock icon or "Security" option in the compose menu.
For highly sensitive documents, file-sharing services with password protection work better. Upload the PDF to Google Drive or Dropbox, set a password on the shared link, and send the password separately through a different channel — for example, text the password while emailing the link. This way, even if someone intercepts the email, they cannot access the file without the password.
Common problems and how to fix them
If the recipient says they did not receive the attachment, the file may have been blocked by their email service's spam filter, especially if it is large or contains certain types of content. Ask them to check their spam or junk folder. If it is not there, try sending it again or using a file-sharing link instead.
If the PDF appears corrupted or will not open, the file may have been damaged during upload or read. Try sending it again, or ask the recipient to try opening it in a different app — sometimes one PDF reader works when another does not. On Windows, try opening it in Microsoft Edge or Adobe Reader. On Mac, try Preview or Adobe Reader.
If you attached the wrong file by mistake, you can usually delete the attachment before sending. Click the X next to the file name in the attachment field. If you already sent it, send a follow-up email with the correct file and ask the recipient to ignore the first one.
Frequently Asked Questions
Can I send a PDF to multiple people at once?
Yes. Add multiple email addresses in the "To" field, separated by commas, or use the "CC" or "BCC" fields. BCC is useful if you do not want each recipient to see the other recipients' email addresses. The PDF attachment sends to everyone in the same message.
What is the difference between attaching a PDF and pasting it into the email body?
An attachment is a separate file the recipient can save and open later. Pasting content into the email body embeds it in the message itself, which works for text but not for PDFs. Always use the attachment button for PDFs — do not try to paste them into the message.
Why does my email say the file is too large?
Most email services limit attachments to 25 MB or 50 MB. If your PDF exceeds this, compress it, split it into smaller files, or use a file-sharing service like Google Drive instead. You can also ask the recipient if they prefer a read link rather than an attachment.
Do I need to convert the PDF to a different format before sending?
No. PDF is a standard format that works everywhere. Sending it as-is preserves the formatting and appearance. Converting it to another format like Word or image files usually causes formatting problems and is unnecessary.
Can the recipient edit the PDF I send them?
That depends on how the PDF was created. Some PDFs allow editing, others do not. If you want to prevent editing, you can password-protect the PDF before sending it. Most PDF readers and online tools have an option to add password protection.