The basic steps for any document

To email a document, you open your email program, start a new message, type the recipient's address and subject line, then use the Attach button to add the file. The button usually shows a paperclip icon and sits near the bottom of the compose window. After you select the document from your computer or phone, the filename appears in the message, and you send as normal.

The exact location of the Attach button and the steps to find your file differ slightly between Gmail, Outlook, Apple Mail, and phone email apps — but the concept is identical across all of them. Once you know the pattern on one platform, you can find it on another.

File size matters. Most email providers reject attachments larger than 25 MB. If your document is a photo-heavy PDF or a video, check the file size before you send. You can usually see this by right-clicking the file on Windows or selecting it on Mac and pressing Command+I.

Key Takeaways

  • Every email program has an Attach button (usually a paperclip icon) that lets you add a file to your message before you send.
  • Email providers typically reject files larger than 25 MB, so check your document size if it contains many images or pages.
  • On a phone, you may need to save the document to your device first, or use the email app's built-in file browser to locate it.
  • Once attached, the filename appears in your message so you can confirm you sent the right document before hitting Send.

Attaching a document in Gmail

Open Gmail in your web browser and click the Compose button (usually a pencil icon on the left side). Type the recipient's email address in the "To" field, add a subject line, and write your message. Below the message text, you will see a paperclip icon — click it to open your file browser.

Navigate to the folder where your document lives, select it, and click Open. The filename will appear as a small box below your message text, showing that the attachment is ready. If you need to remove it, click the X on that box. Once everything looks correct, click Send.

If you are attaching a document you created in Google Docs, Sheets, or Slides, you can also right-click the document name in Google Drive and select "Share" instead — this gives the recipient a link to view or edit it directly without downloading a separate file.

Attaching a document in Outlook (web and desktop)

In Outlook on the web, click New Message, fill in the recipient and subject, then look for a paperclip icon or the word "Attach" near the bottom of the compose window. Click it, then select "Browse this computer" to find your file. Choose the document and click Open.

In Outlook on your Windows computer (the desktop app), the Attach button is in the toolbar at the top of the compose window. Click it, navigate to your file, and select it. The filename will appear in the message area so you can see it before you send.

Outlook also lets you attach files from OneDrive or SharePoint by clicking "Attach" and choosing "Browse cloud locations" instead of your computer. This is useful if the file is very large, because the recipient gets a link rather than a copy in their inbox.

Attaching a document on your phone

On an iPhone or Android phone, open your email app and start a new message. The Attach button location varies: in Gmail's app, it is a paperclip icon at the bottom. In Apple Mail, it is a paperclip icon at the top right. In Outlook's app, it is usually a plus sign or paperclip near the compose area.

When you tap the Attach button, your phone will show a file browser or ask where you want to attach from. You may see options like "Photos," "Files," "Recent," or "Browse." If your document is a PDF or Word file, tap "Files" or "Browse" to navigate to it. If it is a photo or screenshot, tap "Photos" to find it in your camera roll.

Some documents may need to be saved to your phone first. For example, if you received a PDF in email and want to forward it, you may need to open it, tap "Save," and then attach it from your Files app. Check your phone's file manager (Files on iPhone, Files or My Files on Android) to see what documents are stored locally.

What happens after you attach and send

Once you click Send, your email program uploads the file to the email server and delivers it with your message. The recipient downloads the attachment when they open your email. Most email apps show a read icon next to the filename so they know it is there.

If the file is very large (over 20 MB), the upload may take a minute or two, and your email program may show a progress bar. Do not close the program or turn off your device until the upload finishes, or the message may send without the attachment.

After you send, you cannot edit the document you attached — the recipient gets the version you sent. If you need to send a corrected version, you must send a new email with the updated file.

Common problems and how to fix them

The Attach button is grayed out or missing. This usually means your email program is still loading. Wait a few seconds and refresh the page (on web email) or close and reopen the app (on your phone). If it stays missing, try a different browser or update your email app.

The file is too large to attach. If your document is larger than 25 MB, use a cloud storage link instead. Upload the file to Google Drive, OneDrive, or Dropbox, right-click it, select Share, and copy the link. Paste the link into your email message instead of attaching the file. The recipient can open it directly without downloading.

The recipient says they did not receive the attachment. Ask them to check their spam or junk folder — large attachments sometimes get filtered. If it is not there, try sending it again or use a cloud link instead. Also confirm that the filename appeared in your message before you sent it.

You attached the wrong file by mistake. If you have not sent the message yet, click the X on the filename to remove it, then attach the correct one. If you already sent it, send a new email with the correct file and let the recipient know to ignore the first one.

Frequently Asked Questions

Can I attach multiple documents in one email?

Yes. Click the Attach button once, select the first file, then click Attach again to add a second file. Repeat for as many documents as you need. Keep in mind that the total size of all attachments combined cannot exceed your email provider's limit, usually 25 MB.

What file types can I email?

You can attach almost any file type: PDF, Word documents (.docx), Excel spreadsheets (.xlsx), images (.jpg, .png), text files (.txt), and many others. Some email systems block executable files (.exe) for security reasons, but standard document and image formats work everywhere.

Is it safe to email documents with personal information?

Email is not encrypted by default, so anyone with access to your email account or the recipient's account could see the contents. If the document contains sensitive information like a Social Security number or bank details, consider using a password-protected PDF or a find file-sharing service instead.

Why does my attachment show as a preview instead of a read link?

Some email apps display images, PDFs, and other common file types inline (as a preview in the message) rather than as a separate attachment. This is normal and does not affect the recipient's ability to read the file — they can usually right-click the preview and save it to their device.

Can I attach a document from my cloud storage without downloading it first?

Yes. In Gmail, Outlook, and most other email apps, you can click Attach and choose "Browse cloud locations" or "OneDrive" or "Google Drive" to select a file directly from your cloud account without downloading it to your device first. This saves time and storage space on your computer or phone.