Sharing files online is routine, but not all file sharing is equally secure. Whether you are sending a contract, client work, or personal documents, it is worth understanding what makes a transfer safe.
What does "secure file sharing" actually mean?
Security in file sharing involves a few different things:
- Encryption in transit — the data cannot be read while it is moving between you and the server, or the server and the recipient
- Access control — only the right people can open the file
- Limited exposure — the file is not available forever, reducing the window for it to be accessed by the wrong person
- No indexing — the link cannot be discovered by searching
A good file transfer service handles most of this automatically. Here is what to look for.
Encryption in transit
Any reputable file sharing service today uses HTTPS. This encrypts the connection, meaning someone on the same network as you (for example, on public Wi-Fi) cannot intercept the file as it travels. Look for the padlock icon in the browser URL bar when using any web-based service.
Password protection
For sensitive files, adding a password to the transfer is one of the most effective extra layers of protection. Even if the link is forwarded to the wrong person, they cannot access the files without the password.
HeftySend lets you add a password to any transfer, on all plans including free. Recipients see a password entry screen before the download page appears. See Protecting your transfer with a password for how to do it.
Automatic expiry
Files that sit around indefinitely are a security risk. If a link is in someone's email history years later, it could still be used. Transfers with automatic expiry dates solve this by making the link inactive after a set period.
For details on setting expiry dates, see Setting expiry dates on your transfers.
Unique, unguessable links
File sharing services that generate random, unique links for each transfer make it effectively impossible to guess a link by trial and error. Avoid services that use predictable or sequential URLs.
What not to do
- Do not share sensitive files via email attachments — most email providers scan attachments and retention policies are opaque
- Do not use public cloud storage with "anyone with the link" sharing for confidential files
- Do not share the link on public channels (social media, forums) if the files are private
A practical security checklist
For any sensitive file transfer:
- Use a service with HTTPS encryption
- Add a password to the transfer
- Set a short expiry date
- Share the link and password through separate channels (for example, the link by email and the password by text message)
- Confirm the recipient has downloaded what they need, then consider deleting the transfer early if possible
For more on how HeftySend keeps files secure, see How your files are kept secure.