Email Attachment Too Large? 6 Ways to Send Big Files from Your Mac

You finished the presentation, attached it to an email, hit Send — and got the bounce: “Message size exceeds the maximum allowed.”

Gmail caps at 25 MB. Outlook at 20 MB. Apple Mail at 20 MB (before it kicks in Mail Drop). These limits haven’t changed meaningfully in over a decade, but file sizes have. A 3-minute screen recording is 50 MB. A set of brand assets is 200 MB. A batch of photos from a shoot is 2 GB.

Here are six ways to actually send the file, ranked from quickest to most robust.

1. Let Apple Mail handle it (Mail Drop)

If you use Apple Mail, this might already be happening without you realizing.

When you attach a file larger than 20 MB, Mail asks if you want to use Mail Drop. If you say yes, it uploads the file to iCloud and sends the recipient a download link instead of the raw attachment. The file can be up to 5 GB. The link works for 30 days. It doesn’t count against your iCloud storage.

Pros: Zero setup. Works from your regular email workflow. Cons: Apple Mail only (not Gmail or Outlook apps). No tracking. No password protection. 30-day expiry, non-extendable. For a deeper look, see our full guide to Mail Drop.

2. Use a share link instead of an attachment

Instead of attaching the file, upload it to a sharing service and paste the link in your email. The recipient clicks the link and downloads.

Swooshare — Select files in Finder, shake your mouse, the link is on your clipboard. Paste it into your email. Done. 5 GB per share on free, unlimited on Pro.

SwissTransfer — Open the website, upload (up to 50 GB free), copy the link. No account needed.

Google Drive — If you use Gmail, it automatically offers to upload large attachments to Drive and share a link. This works, but the recipient needs to deal with Google’s sharing permissions UI.

Pros: No file size anxiety. The link works regardless of the recipient’s email provider. Cons: An extra step compared to a direct attachment.

3. Compress the file first

Sometimes the file is bigger than it needs to be.

• Images: Open in Preview > File > Export > choose JPEG with 80% quality. A 20 MB PNG might become a 3 MB JPEG.
• PDFs: Open in Preview > File > Export > Quartz Filter > “Reduce File Size.” This can cut PDFs by 50-80%.
• ZIP: Select files in Finder > right-click > Compress. Won’t reduce photos or videos much, but can significantly shrink text files, documents, and folders with many small files.

Pros: No external tool needed. Built into macOS. Cons: Doesn’t help with already-compressed formats (JPEG, MP4, ZIP). Quality loss on images.

4. Share from cloud storage

If the file is already in Dropbox, Google Drive, iCloud Drive, or OneDrive, right-click it and create a share link. Paste the link in your email.

Pros: No separate upload if the file is already synced. Cons: You’re sharing from your personal storage. If you move or delete the file later, the link breaks. Also, the recipient may need to navigate a clunky cloud storage interface to download.

5. Use AirDrop (if they’re nearby)

If the recipient is in the same room with an Apple device, AirDrop sends the file directly without email at all.

Finder > right-click the file > Share > AirDrop > select the recipient.

Pros: Fast, no file size limit, no upload. Cons: Only works with Apple devices in Bluetooth range. If AirDrop isn’t cooperating, see our troubleshooting guide.

6. Use a USB drive

For very large files (10+ GB) or when you’re handing off to someone in person, a USB drive formatted as exFAT (readable on Mac and Windows) is still the fastest option.

Pros: No upload time. No file size limit. Works offline. Cons: Physical handoff required. You need a drive.

Which method to use

Situation	Best method
Fastest workflow (any size)	Swooshare — select, shake, share
Already writing an email	Mail Drop (built into Apple Mail)
One-off huge file	SwissTransfer (50 GB free)
Rush delivery, very large	MASV (fastest speeds)
In-person handoff	USB drive

Stop fighting the 25 MB limit

The email attachment limit is a relic. It exists because email was designed for text messages in the 1990s, and the infrastructure was never upgraded for modern file sizes.

Instead of compressing, splitting, or re-exporting your file to fit under 25 MB, use a link. It takes 10 seconds, the recipient gets the original file at full quality, and you never see a bounce message again.