# Encrypt files
To protect the files you want, add files to Seald and encrypt them for the contacts you want. The files are locally encrypted on your computer and Seald never has access to them. 🗃
- You can encrypt files for Seald or non-Seald contacts.
- You can set security options for each encryption.
- You can encrypt all the formats you want (except .shtml).
- Encrypted files are working files. Editing and saving continue to work as a normal file.
Note: The size of the files encrypted with Seald increases by 1/3, to add the protection layer.
You can only encrypt files that are stored on your computer. To open Seald, click on the Seald icon in the notification area (bottom right) on Windows and Linux or in the status menu bar on MacOS (top right).
- Drag and drop as many files as you want into Seald or click on the drop box to select your files.
- Select or search the Seald or non-Seald contacts who will be the only ones who can open your files.
- If you wish, you can change the security preferences. On the encryption screen, click on the wheel icon to the right of the drop zone.
- When you are ready, click on Encrypt.
You can now send your encrypted files, without risk, through the channel (email, internet, USB key) of your choice. If your recipient does not have the Seald application, they can still open the Seald file using the file format.shtml.
Note: Seald only encrypts files, not sends them.
Tip: You can now track and control your encrypted files.