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How to change the attachment size limitation in Outlook?

Sometimes, I can’t insert a big attachment successfully in Outlook, but get a warning dialog box saying the attachment size exceeds the allowable limit. See following screenshots. This error happens due to exceeding the size limitation of attachments in Outlook. In this article, I will guide you to change the attachment size limitation in Microsoft Outlook.

Change attachment limited size with Registry Editor (6 steps)

Change attachemnt limited size with Kutools for Outlook (3 steps)good idea3


arrow blue right bubble Change attachment limited size with Registry Editor (6 steps)

To change the attachment size limitation in Microsoft Outlook, you have to modify the parameter of MaximumAttachmentSize in the Registry Editor. And you can do it with following steps.

Step 1: Press the Win + R to open the Run dialog box, enter the regedit in the Open box, and click the OK button.

Step 2: In the coming User Account Control dialog box, click the Yes button.

Step 3: Now the Registry Editor window opens. Open the Preferences folder via one of the following paths:

Outlook 2016: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
Outlook 2013
: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences 
Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences 
Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Preferences

Step 4: Click the Edit > New > DWORD (32-bit) Value, and name the new DWORD as MaximumAttachmentSize.

Step 5: Double click the new DWORD to open the Edit DWORD (32-bit) Value dialog box, check the Decimal option, enter the attachment size limitation in the Value data box, and click the OK button. See screenshot below:

For example, you want to change the attachment size limitation to 100MB, enter "102400" in the Value data box.

Note: If you want to remove the attachment size limits in Outlook, just enter "0" in the Value data box.

Step 6: Close the Registry Editor window, and restart Microsoft Outlook.

After changing the attachment size limitation in the Registry Editor window, attachments will be inserted successfully only if their sizes are less than attachment size limitation. See the following screenshot:


arrow blue right bubble Change attachemnt limited size with Kutools for Outlook

With above method to increase attachment size is a little complex, but if you have Kutools for Outlook -- a handy Outlook add-in, you can change the attachment limited size as you need in few clicks.

Kutools for Outlook, Includes
100
 powerful features and tools for Microsoft Outlook 2016, 2013, 2010 and Office 365.

Free install Kutools for Outlook, and then do as below steps:

1. Enable Outlook and click Kutools > Options. See screenshot:
doc increase attachment size 4

2. In the Options dialog, click Other tab, and enter the limited size you want to change to into the textbox besides Maximum Attachment Size section. For instance, here I change the attachment size to 10MB (10240KB). See screenshot:
doc increase attachment size 5

3. Click OK, and a dialog pops up reminding you to restart the Outlook program for the new setting to take effect. See screenshot:
doc increase attachment size 3

After the restart, the attachments size limit is increased.

Tip:

1. If you don't want to limit the attachment size, enter "0" into the Maximum Attachment Size textbox.

2. If you want to set the attachment size to default size, enter "1" into the Maximum Attachment Size textbox.


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Comments (1)
Rated 4.5 out of 5 · 1 ratings
This comment was minimized by the moderator on the site
The problem of this solution is that most of the mail servers in the world are not allowing this size of attachments !

Another option is to use a third party product like Attach2Cloud, this product allows to upload to OneDrive, Sharepoint or Teams the attachments directly from inside Outlook in few seconds through a very easy to use control center.
The limit of the attachment size is then the limit of the size on the cloud service (which is huge ! )
This product can be easily installed and tested, through the fully functional evaluation available on it’s Attach2Cloud website.

And the mail size is only few kb as the attachments are links to the cloud service.
Rated 4.5 out of 5
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