Choose the content and a strong password
On the website, select an image or other file, choose up to 100 files to bundle together, or enter text. The extension protects images. Use a strong, unique passphrase of at least 12 characters. The source-data limit is 50 MiB with noise or 8 MiB when using a public cover image. Bundles must fit the same limit, including their ZIP overhead. The tool checks the input before encryption.
Create the encrypted copy
AES-256-GCM encryption runs in your browser, without an upload or account. Choose noise or a public cover picture for the protected PNG. A cover does not hide the fact that encrypted data is present. The source bytes are preserved unless you explicitly choose to compress an image first; that option changes what the recipient receives. Download the ZIP or PNG and test that you can unlock it before sending important content.
Send the file and password separately
Send the downloaded ZIP or PNG as a file or document, and share the password through another channel. Some outputs include a recovery copy for supported JPEG compression at the same dimensions, but resizing, cropping and other changes can defeat it. Sending the original file is the reliable route. Keep the password: there is no password recovery.
Unlock the original in the browser
The recipient opens the Unlock tool at snapseal.app/unlock or uses the extension, selects the protected file and enters the password. No account or extension is required on the website. Decryption stays in that browser. Anyone who unlocks the content can save or copy it afterward; password protection does not control those copies or encrypt originals already kept in extension history.