Reduce attachment size to send large files with Outlook Outlook limits the size of files you can send This limit prevents your computer from continually trying to upload very large attachments that exceed the limits of most internet service providers For internet email accounts such as Outlook com or Gmail, the email size limit is 20 megabytes (MB)
Email Attachment Size Limits: Every Provider Compared (2026) A comprehensive reference for email attachment size limits across Gmail, Outlook, Yahoo, iCloud, and corporate Exchange servers Learn practical techniques to compress and convert files to fit within limits — without losing quality
Whats my Outlook Attachment Size Limit? (2026) In this article, we will explore the process of sending large email attachments, as we cover the two types of attachments that Outlook supports, various file types you may wish to send, and the technical limitations that work behind the scenes
Outlook Attachment Size Limit: Max File Size (2026) Outlook’s attachment cap depends on which version you’re using: Outlook com (web) allows 34 MB of files from your computer, while desktop Outlook defaults to 20 MB — though Microsoft 365 and Exchange Online mailboxes generally raise that to around 150 MB
Sending limits in Outlook. com - Microsoft Support To help protect against abuse by spammers, Outlook com limits the number of email messages that you can send in a single day, as well as the number of recipients for a single message
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