How to Share Large Files with Clients Securely
If you're a freelancer, agency, or remote team, you share large files with clients daily. Most people use email attachments, WeTransfer, Google Drive, or Dropbox. All have security risks you probably haven't thought about.
Here's a practical guide to doing it right.
The risks you probably don't see
1. Email attachments are unencrypted in transit. Anyone with access to either email account can read the file. Most email providers scan attachments for malware and ad targeting — your client's "confidential" brief is being read by machines.
2. Cloud drives (Drive, Dropbox) store files on servers you don't control. Your client could give their Google password to anyone, and that person would have access to your work. Many cloud drives also lack end-to-end encryption.
3. WeTransfer encrypts files but stores them with the password — the encryption key is on the same server. A breach exposes both.
4. Public sharing links are forwarded by clients to other people, search engines index them, and screenshots spread.
What to do instead
Use FastDDL for final deliverables
FastDDL encrypts files in your browser before upload. The password is generated randomly and shown to you once — never stored on the server. You send the link through one channel (email) and the password through another (Slack, SMS, or verbal). Even if email is intercepted, the file is unreadable.
Use masked filenames for surprise work
If you're delivering work before a launch (brand reveal, product video, confidential report), enable filename masking. Your client sees "FinalDelivery.mp4" instead of "ACME_Project_Confidential_Q3.mp4" — preventing accidental leaks through email previews or screenshots.
Set short expiry times for sensitive work
Use 1-hour expiry for previews. 24-hour for final deliverables. 48-hour for assets clients might need to reference. Files auto-delete — no manual cleanup needed.
Burn $DDLX to extend important files
Need a file to stay live for a project duration? Burn 1,000 $DDLX to extend it 30 days. Your client can re-download anytime without you resending.
A workflow that works
- Drop file in FastDDL, enable masking if sensitive
- Set expiry to match project needs (1-48 hours)
- Copy the link from the result screen
- Email the link to client (subject: "Final deliverable — secure link")
- Send password via Slack DM or text message
- Tell client: "Link expires in 24 hours — download now"
- File auto-deletes — no need to clean up
For repeat clients
If you work with the same client regularly, use the burn 30 days option for assets they need ongoing access to (brand kits, templates, source files). Each burn extends the clock by 30 days — perfect for ongoing projects.
For NDAs and confidential work
If your work is under NDA, consider also:
- Watermarking previews with the client's name (visible deterrent)
- Sending low-res previews via FastDDL, full-res files after payment clears
- Using permanent storage ($50K DDLX burn) for final deliverables that must never be deleted
FastDDL is free for up to 2GB files. Start using it →