Compress Video for Outlook Email Attachments
Need to compress a video for an Outlook email attachment? Outlook.com documents a 25MB attachment limit, while work and school systems can apply different policies. This preset reduces the video to a 20MB target for extra margin and processes it locally.
Quick answer
For an Outlook.com attachment, compress the video to a conservative 20MB target so it stays below the documented 25MB ceiling with some margin. Managed work or school mailboxes can use different limits, so check the policy when delivery is critical.
How to compress a video for Outlook
- Choose the video you plan to attach in Outlook.
- Keep the target at 20MB and start the local compression.
- Download the result and attach it to the Outlook message.
Tips for a better result
- Ask the recipient for their mailbox limit when an organization manages either account.
- Use the email guide below when a longer video needs a cloud link instead of more compression.
Reviewed 2026-07-14
How to reduce video size for Outlook email
Outlook.com documents a 25MB maximum attachment size. Administrators can set different limits for managed mailboxes, so 20MB is a conservative preset rather than the official Outlook.com ceiling.
Sources: Outlook.com sending limits · Reviewed 2026-07-14
Frequently asked questions
- How do I compress a video for an Outlook email?
- Choose the video, keep the 20MB target, and start compression. The result is designed to sit below Outlook.com's documented 25MB ceiling while leaving room for mailbox-specific limits.
- What is Outlook's attachment size limit?
- Outlook.com documents a 25MB attachment limit. Managed Exchange or Microsoft 365 environments may use an administrator-defined limit.
Related private video workflow
Need the broader decision tree? Read the guide on compressing video without uploading it. If you need a short silent loop instead of an MP4, try the video to GIF converter.
Trying to send the file as an attachment? Use the guide to send a video by email when the file is too large before deciding whether to compress further or send a cloud link.