How to Send Large Files Without Email Attachments

Applies to: Microsoft 365, OneDrive, SharePoint, Outlook
Article Type: How-To
Last Updated: 2026-05-19

Summary

This article explains how to share large files with colleagues and external contacts when email attachments are not practical. Outlook typically limits attachments to 25 MB, and many recipients' mailboxes cannot handle large files. Using OneDrive or SharePoint sharing links is the recommended alternative — it is faster, more secure, and avoids bounced emails.

Prerequisites

• A Microsoft 365 account with OneDrive access.
• The file(s) you want to share saved to your computer, OneDrive, or a SharePoint site.
• For external sharing: your organization's sharing policies must allow external links. If you are unsure, ask IT to confirm whether external sharing is turned on for your account and which recipient domains are allowed.

Instructions

1. Understand Why Email Attachments Have Limits

Limitation	Details
Outlook attachment size limit	25 MB per message (desktop and web).
Recipient mailbox limits	If the recipient's mailbox is full, your email bounces back.
Multiple attachments add up	Five 5 MB files equal 25 MB — hitting the limit with no room for the email body.
Attachments create copies	Every recipient gets a separate copy, wasting storage and creating version confusion.

The better approach: Upload the file to OneDrive or SharePoint and send a sharing link. The recipient downloads the latest version directly — no size limit, no bounced emails, no version drift.

Tip: If the oversized file is a PowerPoint deck, it is often worth shrinking it first — full-resolution photos and embedded video account for most of the weight, and compressing them can bring a 90 MB deck under the attachment limit. See How to Shrink a Large PowerPoint File.

2. Share via OneDrive Link (From Outlook)

Outlook can automatically replace a large attachment with a OneDrive link. This is the fastest method.

1. Open Outlook and create a New Email.
2. Click Attach File (paperclip icon).
3. If the file is already in OneDrive, select it from the Recent Items or Browse Web Locations > OneDrive list.
4. If the file is on your local computer, attach it normally. If it exceeds the size limit, Outlook will prompt you to Upload to OneDrive and share as a link — click Yes.
5. The attachment icon changes to a cloud link icon, indicating the file is shared as a link instead of an embedded attachment.
6. Send the email. The recipient clicks the link to view or download the file.

Tip: You can change the link permissions before sending. Click the small dropdown arrow next to the attached link and choose:

• Anyone with the link can edit — Most open (use for trusted recipients).
• Anyone with the link can view — View-only, no editing.
• Specific people — Only the named recipients can access the file.

3. Share via OneDrive Link (From OneDrive Directly)

Use this method when you want to share a file outside of Outlook (e.g., in a Teams chat, a text message, or a third-party tool).

1. Open OneDrive (web at onedrive.com or the OneDrive folder in File Explorer).
2. Right-click the file or folder you want to share.
3. Select Share (or Copy link).
4. Choose the sharing scope:
   • People in your organization with the link — Anyone internal can access it.
   • People with existing access — Only people already shared with.
   • Specific people — Enter email addresses for targeted access.
   • Anyone with the link — Generates a public link (if allowed by IT).
5. Set optional controls:
   • Allow editing — Toggle off for view-only access.
   • Set expiration date — The link stops working after a specified date.
   • Set password — Requires a password to open (available on some plans).
   • Block download — Allows viewing but prevents downloading (available on some plans).
6. Click Copy link and paste it into your email, chat, or message.

4. Share via SharePoint Document Library

If the file belongs to a team project, uploading it to a SharePoint document library is the best approach.

1. Navigate to the SharePoint site for your team or project.
2. Open the Documents library (or the appropriate document library).
3. Click Upload and select the file, or drag and drop it into the library.
4. Once uploaded, click the three-dot menu (⋯) next to the file and select Share or Copy link.
5. Configure permissions as described in Step 3 above.
6. Share the link via email, Teams, or any other channel.

Tip: If your team already has a Teams channel, the channel's Files tab is a SharePoint document library. Upload the file there and it is automatically accessible to everyone in the channel.

5. Use OneDrive to Share a Folder of Files

When you need to share multiple files at once, share a folder instead of individual files.

1. In OneDrive, create a new folder (or use an existing one).
2. Move or copy all the files you want to share into this folder.
3. Right-click the folder and select Share.
4. Configure permissions (same options as Step 3).
5. Share the link. The recipient sees the entire folder and can browse, download, or (if allowed) upload files to it.

6. Compress Files Before Sharing (Optional)

If you need to share multiple files and cannot use a cloud link, compress them into a ZIP file to reduce the total size.

1. Select all the files you want to compress in File Explorer.
2. Right-click and select Compress to ZIP file (Windows 11) or Send to > Compressed (zipped) folder (Windows 10).
3. Name the ZIP file and attach it to your email.

This method reduces file size but is still limited by the 25 MB attachment cap. For anything larger, use a OneDrive or SharePoint link.

See How to Compress and Extract ZIP Files in Windows 11 for detailed instructions.

7. Quick Decision Guide

Scenario	Best Method
Sending a single file over 25 MB	OneDrive link via Outlook (Step 2)
Sharing files with external contacts	OneDrive link with "Specific people" (Step 3)
Team project files that everyone needs access to	SharePoint document library (Step 4)
Sharing a collection of related files	OneDrive shared folder (Step 5)
Sending a few small files under 25 MB total	Normal email attachment (standard method)
Sharing sensitive/confidential files externally	OneDrive link with expiration + password (Step 3)

Troubleshooting

DANGER

Never send confidential or sensitive files using "Anyone with the link" sharing. Use "Specific people" with an expiration date for maximum security. If you are unsure about your organization's external sharing rules, ask IT to confirm what you are allowed to send outside the company before you send it — name the recipient's domain and the kind of data the files hold.

Symptom / Error	Potential Cause	Solution
"The file is too large to attach"	File exceeds 25 MB Outlook limit	Upload to OneDrive and share as a link (see Step 2).
Email bounced back with size error	Recipient's mailbox or server rejected the file	Resend using a OneDrive/SharePoint sharing link instead of an attachment.
Recipient says "You need permission to access"	Sharing scope set to internal only	Edit the sharing link and add the recipient's email under "Specific people."
"External sharing is disabled"	IT policy blocks external links	Contact IT to request external sharing for the specific file or folder.
Recipient cannot download the file	"Block download" is enabled on the link	Edit the sharing link settings and uncheck Block download.
Link expired	Expiration date has passed	Generate a new sharing link with an updated expiration date.

Related Articles

• How to Shrink a Large PowerPoint File
• How to Share Files and Folders via OneDrive
• How to Manage Email Attachments and Send Large Files in Outlook
• How to Compress and Extract ZIP Files in Windows 11
• How to Manage PDF Files — Combine, Sign, Annotate, and Compress
• How to Create a Shared Folder in OneDrive
• Understanding File Sharing and Permissions in Microsoft 365
• Understanding Where Your Files Live — OneDrive vs. SharePoint vs. Teams

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