ByteSeal

Offline, browser-based file encryption
using .byts containers.
No servers. No accounts. No uploads.

How it works

01 Drop or pick any file

02 Set a strong password

03 Download the encrypted .byts container

Container format

8 B

1 B

16 B

12 B

—

magic

ver

salt

ciphertext

⬡ AES-256-GCM encryption ⬡ PBKDF2 · 250,000 iterations ⬡ Runs 100% in your browser ⬡ Zero network requests