Secret Encoder

Scramble messages with a secret key — only you and your friend can read them

Your message

Shift key3

125

Encoded message

Your result will appear here

Alphabet mapping

A↓D

B↓E

C↓F

D↓G

E↓H

F↓I

G↓J

H↓K

I↓L

J↓M

K↓N

L↓O

M↓P

N↓Q

O↓R

P↓S

Q↓T

R↓U

S↓V

T↓W

U↓X

V↓Y

W↓Z

X↓A

Y↓B

Z↓C

What you just learned

You just used encryption — scrambling a message so only someone with the key can read it. Every time you see a lock icon in your browser, encryption is protecting your data.