The basic steps for attaching a file

To attach a document to an email, you open a new message, look for a button or icon that looks like a paperclip, click it, and select the file from your computer. The file then appears as an attachment in your message, and the recipient can read it when they open the email. The exact location of the attachment button changes depending on which email service you use, but the concept is the same across Gmail, Outlook, Yahoo Mail, and most others.

Before you attach anything, make sure the file actually exists on your computer and you know roughly where it is stored — usually in Documents, Downloads, or a folder you created yourself. If you cannot find the file, you may need to save it first before you can send it.

Key Takeaways

  • The attachment button usually looks like a paperclip and sits near the bottom of the compose window, though its exact location varies by email service.
  • You can attach multiple files to a single email, but most services limit the total size to between 20 and 25 megabytes.
  • After you click the attachment button, your computer opens a file browser where you navigate to the file you want to send.
  • Once attached, the file name appears in the message so you can confirm it is the right one before you hit send.

Finding the attachment button in Gmail

In Gmail, open a new message by clicking the Compose button. At the bottom of the message box, you will see a row of small icons. The paperclip icon is the attachment button — click it, and a window opens showing the folders on your computer. Navigate to the file you want, click it once to select it, then click Open. The file name now appears below the message text with a small paperclip next to it.

If you want to attach more than one file, click the paperclip again and repeat the process. Gmail lets you add multiple files as long as the total size does not exceed 25 megabytes. You can also drag and drop files directly into the message box instead of using the paperclip button — Gmail will treat them as attachments automatically.

Attaching files in Outlook and Outlook.com

In Outlook (the desktop program), click File, then New, then Email Message. In the new message window, look for the Attach File button in the toolbar at the top — it looks like a paperclip. Click it, browse to your file, select it, and click Insert. The file appears in the Attachments section above the message body.

In Outlook.com (the web version), compose a new message and look for the paperclip icon near the bottom of the message box. Click it to open the file browser, find your file, and click Open. Outlook.com also supports drag-and-drop: you can drag a file from your computer directly into the message area, and it will attach automatically. The size limit for Outlook.com is 20 megabytes per attachment.

Attaching documents in Yahoo Mail and other services

Yahoo Mail works similarly to Gmail. Click Compose to open a new message, then look for the paperclip icon at the bottom of the message box. Click it, select your file from the browser window, and click Open. Yahoo Mail also supports drag-and-drop attachments. The maximum file size is 25 megabytes.

Most other email services — including Apple Mail, ProtonMail, and Thunderbird — follow the same pattern: find the paperclip icon, click it, select your file, and confirm. If you cannot find a paperclip icon, look for a button labeled Attach or Add File, or check the service's help section for the exact location. The principle never changes, even if the button location does.

Understanding file size limits and what happens when you exceed them

Every email service sets a maximum size for attachments. Gmail, Yahoo Mail, and most others allow up to 25 megabytes per message. Outlook.com allows 20 megabytes. If you try to send a file larger than the limit, the email service will show an error message and prevent you from sending until you remove the oversized file or use a different method.

A megabyte is a unit of file size. Most documents — Word files, PDFs, spreadsheets — are small enough to send without trouble. Photos and videos are much larger. A single photo from a smartphone is usually 2 to 5 megabytes; a short video can be 50 to 500 megabytes. If you need to send a very large file, consider using a file-sharing service like Google Drive, Dropbox, or OneDrive instead of email. These services let you upload the file once and share a link, which the recipient can read without size restrictions.

Confirming the attachment before you send

After you attach a file, always look at the message one more time before clicking Send. The file name should appear somewhere in the compose window — usually below the message text or in a separate Attachments section. Check that it is the correct file and that you have not accidentally attached the wrong version.

This is especially important if you are sending sensitive information like tax documents, medical records, or financial statements. Take five seconds to confirm the file name matches what you intended to send. Once you click Send, the email is gone, and the recipient has the file. If you attached the wrong document, you cannot undo it.

What to do if the attachment does not appear

If you clicked the paperclip button but the file did not attach, the most common reason is that you accidentally closed the file browser window without selecting a file. Click the paperclip again and complete the process: navigate to the file, click it to select it, then click the Open or Attach button at the bottom of the window.

If the file browser opened but you could not find your file, it may be stored in a location you did not expect. Look in Documents, Downloads, Desktop, or any folder you remember creating. If you still cannot find it, you may need to save the document first — for example, if you created a Word document but never saved it, it does not exist on your computer yet and cannot be attached. Save the file, close the email, and start over.

Frequently Asked Questions

Can I attach a file that is on my phone or tablet instead of my computer?

It depends on the email service and the device. Gmail and Outlook on a phone or tablet usually let you attach files stored on that device. Look for the paperclip icon in the compose window, tap it, and select the file from your phone's storage. You can also take a photo or video directly from the camera app and attach it without saving it first.

What happens if I attach a file and then delete it from my computer?

Deleting the file from your computer does not affect the attachment in the email. Once you attach a file, the email service makes a copy of it. The recipient will still receive the file even if you delete your original copy later. This is why you can safely delete files after sending them without worrying that the recipient will lose access.

Can I attach a folder instead of individual files?

Most email services do not let you attach a folder directly. You have to attach individual files one at a time. If you need to send multiple related files, attach them all to the same message — the recipient will receive them together. Alternatively, you can compress the folder into a single ZIP file and attach that, though the recipient will need to unzip it to access the contents.

Why does my attachment show as a link instead of a file I can read?

Some email services, particularly Gmail and Outlook, automatically convert large files or certain file types into links to cloud storage instead of traditional attachments. This happens to protect you from size limits and to make the file easier to access. The recipient can still read the file by clicking the link — it works the same way from their perspective.

Is it safe to attach files to email?

Attaching files to email is generally safe, but be cautious about what you send and to whom. Do not attach sensitive information like passwords, Social Security numbers, or banking details to email unless you are certain the recipient is who you think they are. Email is not encrypted by default, so anyone with access to the email account could potentially see the attachment. For highly sensitive files, consider using a find file-sharing service instead.