File size limits
Outlook attachment size limit: 25 MB, and how to send more
Microsoft sets the attachment size limit for files in Outlook.com at 25 MB. A bigger file will not go as an attachment. To send it anyway, upload it here and paste a link into the email.
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The Outlook attachment size limit is 25 MB on Outlook.com, according to Microsoft's own help page on sending limits. A file over 25 MB cannot go as an attachment. Microsoft suggests sharing the file from its cloud storage instead, where the limit for a shared file is 2GB. Work accounts may follow other rules.
What to do when an Outlook attachment is over 25 MB
Microsoft's help page states the limit in one line: the attachment size limit for files in Outlook.com is 25 MB. Anything bigger has to reach the other person some other way.
The same page points to sharing the file from Microsoft's cloud storage, so the recipient gets a link rather than an attachment, and it gives a limit of 2GB for files shared that way.
The page covers Outlook.com. It does not give a figure for work or school mailboxes, so check with your IT team if you send from one of those.
What Microsoft suggests: share a cloud link
Microsoft's advice for larger files is to share them from its own cloud storage, which also lets people work on the file together. That suits people who already keep their files there. The file stays in your storage, and its sharing settings decide who can open it.
Send a bigger file through Outlook
A file over 25 MB, sent as a link in three steps
The file goes to FileSeen once; the Outlook message carries only a short address.
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Step 1
Upload the file
Drop it on the box above. Anything up to 95 MB, except video.
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Step 2
Confirm your email
Type the 6-digit code FileSeen sends you. It keeps the service free of abuse.
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Step 3
Paste the link into Outlook
Write the message as usual and paste the link where the file would have gone.
Send a file over 25 MB with Outlook: share a link instead
Upload the file in the box at the top of this page and FileSeen gives you a short link. Paste it into your Outlook message where the attachment would have gone. One file can be up to 95 MB, and it is kept exactly as you made it.
- Nothing to install for the reader. The link opens in any browser on a phone or a computer, with no account and no app.
- You know when it is read. You get an email every time it is opened, and the link's stats page shows each open, the country and the reading time.
- You stay in control. Add a password or an expiry date, or delete the link, and it stops working for everyone at once.
The free plan has every feature on 3 links, with no time limit. Video files cannot be uploaded.
How the Outlook limit compares
| App | Limit | Applies to | Source and date checked |
|---|---|---|---|
| Gmail | 25 MB | Sending, all attachments on one email together, personal accounts | Gmail Help, 21 October 2026 |
| Outlook | 25 MB | Sending attachments from an Outlook.com account | Microsoft Support, 22 October 2026 |
| Google Drive | 5 TB | Storing one file in Drive, file types other than Google Docs, Sheets, Slides, Sites and Vids | Drive Help, 23 October 2026 |
| FileSeen link | 95 MB per file | Any file except video; the message carries only the link | FileSeen features page |
FAQ
Outlook file size questions
What is the Outlook attachment size limit?
Microsoft's help page gives 25 MB as the attachment size limit for files in Outlook.com.
Is the limit the same on a work or school Outlook account?
Not necessarily. The Microsoft page quoted here covers Outlook.com only. Work and school mailboxes are set up by their organization, so ask your IT team.
How do I send a file larger than 25 MB from Outlook?
Upload it to FileSeen, copy the link and paste it into the email. One file can be up to 95 MB, except video, and the free plan has every feature on 3 links.
Does the person I email need an account to open the link?
No. A FileSeen link opens in any browser on a phone or computer, with no account and no app.
Can I see whether the file was opened?
Yes. You get an email every time a FileSeen link is opened, and its stats page lists every open with the country and the reading time.
File size limits