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Email attachment size limit (checked October 2026)

Short answer

The max email attachment size is 25 MB per message at Gmail, Outlook.com and Yahoo Mail. iCloud Mail and the Outlook app (for internet accounts) stop at 20 MB.

The limits on one scale

Logarithmic scale. Limits from official help pages, checked 8 October 2026. Size limits on the scale: Gmail (personal): 25 MB; Outlook.com (web): 25 MB; Outlook app, internet accounts: 20 MB; Work email (Exchange default): 10 MB; Yahoo Mail: 25 MB; iCloud Mail: 20 MB.

Email attachment size limits by provider

Email attachment limits, checked 8 October 2026
Provider Limit Source Checked
Gmail (personal) 25 MB total attachments Gmail Help
Outlook.com (web) 25 MB Microsoft: Outlook.com sending limits
Outlook app, internet accounts 20 MB default Microsoft: attachment size in Outlook
Work email (Exchange default) 10 MB counts the encoded message Microsoft: attachment size in Outlook
Yahoo Mail 25 MB total per message Yahoo Help
iCloud Mail 20 MB per message Apple Support

Why Outlook has two numbers: Outlook.com on the web accepts 25 MB, but the Outlook app uses 20 MB by default for internet accounts such as Outlook.com and Gmail. If you don’t know which one will be used, aim for 20 MB.

Will it fit?

Enter a file size to check it against each email attachment limit.

Gmail, Yahoo and Outlook.com count the files you attach. On strict work servers the email size limit counts the encoded message, which is about 37% larger, so a 10 MB limit holds about 7 MB of files. The recipient’s server can also accept less than yours.

  • Gmail (personal) 25 MB Tight: right at the limit
  • Outlook.com (web) 25 MB Tight: right at the limit
  • Outlook app, internet accounts 20 MB Too large
  • Work email (Exchange default) 10 MB Too large
  • Yahoo Mail 25 MB Tight: right at the limit
  • iCloud Mail 20 MB Too large

Fits: 0 · Tight: 3 · Too large: 3

Sources

Every limit comes from the provider’s own help page, checked on 8 October 2026. Limits change, so check the date.

  1. Gmail (personal) support.google.com/mail/answer/6584
  2. Outlook.com (web) support.microsoft.com/en-us/office/sending-limits-in-outlook-com-279ee200-594c-40f0-9ec8-bb6af7735c2e
  3. Outlook app, internet accounts support.microsoft.com/en-us/office/reduce-attachment-size-to-send-large-files-with-outlook-8c698842-b462-4a4c-8d53-5c5dd04f77ef
  4. Work email (Exchange default) support.microsoft.com/en-us/office/reduce-attachment-size-to-send-large-files-with-outlook-8c698842-b462-4a4c-8d53-5c5dd04f77ef
  5. Yahoo Mail help.yahoo.com/kb/SLN5673.html
  6. iCloud Mail support.apple.com/en-us/102198

Two ways

Two ways to a smaller file.

On iPhone and Android

Metras

Exact sizes, batches in the background, originals kept. For iPhone (iOS 15 or later) and Android (8.0 or later).

Coming soon to the App Store

Get it on Google Play

Questions

Why did my email bounce when the file was under the limit?

Attachments are encoded when the email is sent, so the message ends up larger than the files in it. The recipient’s server may also accept less than yours. If a file is right at the limit, make it a little smaller.

Whose limit counts, mine or the recipient’s?

Both. Your provider limits what you can send, and the recipient’s server limits what it accepts. Many work inboxes accept less than 25 MB.

How big of a file can you email?

It depends on the provider: 25 MB at Gmail, Outlook.com and Yahoo Mail, 20 MB at iCloud Mail and in the Outlook app, and 10 MB by default on Exchange work accounts. Those are your limits for sending, before the recipient’s own limit.

What size video can I email?

The same limits apply to a video as to any file. A minute of 1080p video is about 70–105 MB (Apple’s estimate), so a phone video usually has to be made smaller first: about 24 MB for a 25 MB limit, 19 MB for 20 MB, or 7.2 MB for a 10 MB work server. You can compress video for email in your browser, and nothing is uploaded to a server. The video size calculator shows how long a video fits in each size.

What if my email is too large to send?

Check which limit applies, yours or the recipient’s, then make the largest file smaller. Leave some room: attachments grow when the email is encoded, so a file right at the limit can still bounce.

How do I send a video that is too large for email?

Make the video smaller than the limit that applies, then attach that copy. Find the limit in the table above and compress video for email at that size. The tool aims a little under the limit and tells you before you start if the video is too long to fit.