The Email Attachment Problem
Most email providers limit attachments to 20-25 MB. To make it worse, email encoding inflates attachments by ~35%, so a 20 MB file shows up as 27 MB on the other side and bounces.
| Email Provider | Maximum Size | Built-in Cloud Integration |
|---|---|---|
| Gmail | 25 MB | Google Drive (auto-upload) |
| Outlook/Hotmail | 20 MB | OneDrive integration |
| Yahoo Mail | 25 MB | No automatic integration |
| Apple Mail (iCloud) | 20 MB | Mail Drop (up to 5 GB) |
Here's how to work around it.
Method 1: Cloud Storage Links (Best for Existing Users)
If you already use Google Drive, Dropbox, or OneDrive, this is the simplest solution.
Google Drive (15 GB Free)
Upload to Google Drive, right-click → Share → "Anyone with the link" → copy and paste in your email. If you attach a file over 25 MB in Gmail, this happens automatically.
Dropbox (2 GB Free)
Upload to Dropbox, click Share → Create link, paste in your email.
Add ?dl=1 to the end of a Dropbox link to skip the preview page and go straight to download.
Microsoft OneDrive (5 GB Free)
Upload to OneDrive, right-click → Share → copy link. Outlook prompts this automatically for large attachments.
Method 2: File Transfer Services (Best for Large Files)
Purpose-built for sending large files temporarily. No storage quota used, often no account required.
Transfer.zip (Up to 1 TB, 7-day Free Trial)
Transfer.zip gives you a 7-day free trial that unlocks transfers up to 1 TB with files retained for up to a year. End-to-end encrypted, recipients don't need an account. Upload your files, copy the link, and paste it in your email. Best for files over 50 GB or when privacy matters.
Transfer.zip's homepage.
SwissTransfer (Up to 50 GB, Free)
Drag and drop files at SwissTransfer, generate a link, paste in email. Files stored 30 days, no account needed, no ads.
SwissTransfer's upload page.
WeTransfer (Up to 3 GB Free)
Add files at WeTransfer, pick email or link, click Transfer. 7-day retention, 10 transfers/month cap on the free tier.
Method 3: Compress First (Only Helps for Text/Docs)
Zip works on text files and documents (70-90% reduction). It barely touches videos, photos, PDFs, or MP3s, since those are already compressed. Skip this step for those.
Windows: Right-click → Send to → Compressed (zipped) folder Mac: Right-click → Compress "[filename]"
Method 4: Use Your Email Client's Built-in Big-File Feature
If your file is just slightly over the limit, your email provider may handle it automatically:
- Gmail - Files over 25 MB auto-upload to Google Drive and insert a link.
- Apple Mail - Mail Drop sends files up to 5 GB via iCloud, activated automatically over 20 MB.
- Outlook - Prompts you to upload large files to OneDrive.
FAQ
Why does my 20 MB file fail to attach? Email encoding inflates attachments by ~35%. A 20 MB file becomes ~27 MB when attached, breaking Gmail's 25 MB limit. Aim for 15-18 MB max if you want to be safe.
What's the easiest way to send large files by email? Upload your files to Transfer.zip's free trial (up to 1 TB), copy the link, and paste it in your email. Recipients can download any time before the link expires.
How long do transfer links last? WeTransfer: 7 days. SwissTransfer: 30 days. Transfer.zip: up to 1 year on paid plans, with a 7-day free trial included.
Bottom line: Email wasn't built for large files. For anything over 20 MB, send a link instead. Transfer.zip handles up to 1 TB with a 7-day free trial.