How to reduce image's size in Outlook?
Supposing you need to send friends some large photos via Microsoft Outlook, no matter how you attach these photos as attachments or insert photos in the message body directly, these photos may be too big for recipients to receive or view regularly. Actually, you can resize both of attached images and images in messages body before you send the message.
Resize attached photos in Outlook 2010 and 2013
Reduce the size of inserted photos in message body
Resize attached photos in Outlook 2010 and 2013
This section will talk about resizing big attached photos which you added by Insert > Attach File in message window in Outlook 2010 and 2013.
Step 1: Create a new message with clicking the New- Email button on the Home tab in the Mail view.
Step 2: In the message window, please click the Attach File button on the Insert tab.

Step 3: In the popping up Insert File dialog box, please find out and select pictures, and click the Insert button.

Step 4: In the Message window, click the File > Info.
Step 5: Now please check the option of Resize large images when I send this message. See the following screen shot:

Step 6: Compose your email message and send it.
Note: This method will resize big attached photos at a maximum of 1024x768 pixels in Outlook 2010 and 2013.
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Reduce the size of photos in message body
Most of time, you may layout photos in the body of messages directly, which make your messages much attractive. However, the photos may be too large for recipients to view regularly. This section will help you solve this problem, and reduce the size of inserted photos in message body easily.
Step 1: Create a new message:
- In Outlook 2010 and 2013, please click the New E-mail button on the Home tab in Mail view;
- In Outlook 2007, please click the File > New > Mail Message, or just clicking the New button in the Ribbon.
Step 2: Insert pictures in the message body with clicking the Picture button on the Insert tab.
Note: The Picture button will be gray until you put the cursor in the body of message.
Step 3: In the popping up Insert Picture dialog box, please find out and select pictures, and click the Insert button.
Step 4: Right click the inserted picture, and select the Size and Position (or Size in Outlook 2007) in the right-clicking menu.

Step 5: In the new dialog box, go to the Scale section on the Size tab, and you can specify the percent of both Height and Width according to your needs, for example 30%. See the following screen shot:

Step 6: Click the OK (or Close) button to exit the dialog box.
Step 7: Compose the message and send it.
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