Yes. Cipher is completely free with no account and no sign-up.

Does Cipher upload my data?

No. It runs entirely in your browser; your files and text are not uploaded to any server.

Do I need to install anything?

No install. It is a web app that works in any modern browser.

Encode, hash, decode JWTs, and generate IDs, all in your browser via Web Crypto.

Format

Plain text

Base64

Two-way live conversion. UTF-8 safe. Edit either side.

Input text

Algorithm

Output

HMAC key (optional, leave blank for plain digest)

Digest

Result

JWT

Header

Payload

Verify signature

UUID v4

ULID

Crockford Base32: 48-bit timestamp + 80-bit randomness. Lexicographically sortable.