Put a password on a file before sending it
If you're sending a file with private details, you can lock it with a password first. Encrypt a file makes a locked copy with .enc added to its name. The other person needs your password and this same tool to open it, so check that they're happy to use it. The file and password stay in your browser while the tool works.
1. Check the file and its name
Remove anything the recipient shouldn't see, including private details saved inside the file. Encryption locks the contents; it doesn't clean them. Check the filename too. A file called private-project.pdf becomes private-project.pdf.enc, so rename your sending copy if its name gives too much away.
2. Save a strong, separate password
Use a unique random password or passphrase and save it somewhere protected. Password generator can make one in your browser. The tool requires eight characters, but that is only its minimum. Avoid dates, the filename and passwords you already use for an account.
3. Make the locked copy
Open Encrypt a file, select Encrypt and choose your prepared file. Enter the password twice and press Encrypt file. Download the .enc result before closing the page. Large files can need more memory than your device has, even though the tool works through them in smaller pieces.
4. Try opening the download yourself
Select Decrypt and choose the .enc file you just downloaded. Enter its password and press Decrypt file, then download and open the restored file. For an exact comparison, File checksum can calculate a SHA-256 code for each file. Matching codes mean the restored file matches the original byte for byte.
5. Send the password another way
Send the .enc attachment through your chosen message or storage service. Give the password through a different route, such as a phone call to a number you have checked. Include the Encrypt a file page address so the recipient knows how to open it. A password in the same message as the attachment gives a reader both pieces.
6. Keep what you'll need to open it later
Keep your private original until the recipient confirms they can open the file. Save the password for as long as you need the locked copy. This site's .enc format won't open in ordinary ZIP software or a PDF reader, and there is no password reset if you forget it.
Good to know
Encryption leaves the attachment name, approximate size and message recipients visible. It doesn't make a file expire or let you recall it. The recipient can keep an unlocked copy. A weak password or an unsafe device can also put the contents at risk.