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Rhad ac am ddim Caesar Cipher & Text Encryptor

Encrypt and decrypt text with Caesar cipher, ROT13, Atbash, and Vigenère cipher. Classic substitution ciphers, all in your browser.

Runs in your browserNo sign-up, no pop-upsNid oes angen mewngofnodiAm ddim am byth

Shifts each letter by 13. Self-inverse — applying it twice returns the original.

Input
Output
Gur dhvpx oebja sbk whzcf bire gur ynml qbt.

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Sut Mae'n Gweithio

1
Ewch i mewn
Rhowch eich testun neu ddata.
2
Proses
Wedi'i brosesu ar unwaith yn eich porwr. Dim gweinydd, dim aros.
3
Lawrlwythwch
Arbedwch eich canlyniad. Nid oes dim yn cael ei storio.

Pam defnyddio ein un ni?

Completely free — no hidden costs, ever
No account, email, or login required
Runs entirely in your browser — no uploads
Works on any device — phone, tablet, desktop
Open and ad-supported, with no tracking
Loads fast, with no installation needed

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