ROT13 Encoder / Decoder

Encode or decode text with ROT13 cipher online for free.

Rotates letters A–Z by 13. Self-inverse.

Input

Output (live)

Apply again to decode

Gur dhvpx oebja sbk whzcf bire gur ynml qbt 123

Original	→	Encoded
T	→	G
h	→	u
e	→	r
q	→	d
u	→	h
i	→	v
c	→	p
k	→	x
b	→	o
r	→	e
o	→	b
w	→	j
n	→	a
f	→	s
o	→	b
x	→	k
j	→	w
u	→	h
m	→	z
p	→	c

關於此工具

Apply the ROT13 substitution cipher to any text. ROT13 replaces each letter with the letter 13 positions ahead in the alphabet. Since the alphabet has 26 letters, applying ROT13 twice returns the original text.

使用方法

Enter Text
Type or paste text to encode with ROT13.
Encode
The result appears instantly. ROT13 is its own inverse — encode again to decode.
Copy
Copy the encoded/decoded text.

使用場景

Spoiler Hiding

Hide spoilers or puzzle answers in plain sight using ROT13.

常見問題

Is ROT13 secure for encryption?

No. ROT13 is a simple letter substitution with no key. It is only useful for obscuring text, not for real security.

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Original	→	Encoded
T	→	G
h	→	u
e	→	r
q	→	d
u	→	h
i	→	v
c	→	p
k	→	x
b	→	o
r	→	e
o	→	b
w	→	j
n	→	a
f	→	s
o	→	b
x	→	k
j	→	w
u	→	h
m	→	z
p	→	c

Original	→	Encoded
T	→	G
h	→	u
e	→	r
q	→	d
u	→	h
i	→	v
c	→	p
k	→	x
b	→	o
r	→	e
o	→	b
w	→	j
n	→	a
f	→	s
o	→	b
x	→	k
j	→	w
u	→	h
m	→	z
p	→	c

關於此工具

使用方法

Enter Text

Encode

Copy

使用場景

Spoiler Hiding

常見問題

Is ROT13 secure for encryption?

相關工具

Original	→	Encoded
T	→	G
h	→	u
e	→	r
q	→	d
u	→	h
i	→	v
c	→	p
k	→	x
b	→	o
r	→	e
o	→	b
w	→	j
n	→	a
f	→	s
o	→	b
x	→	k
j	→	w
u	→	h
m	→	z
p	→	c