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rot 13 transformer online w3docs w3docs bücher html lernen css lernen javascript lernen git lernen java lernen php lernen python lernen kurse quizze übungen snippets tools general tools html editor password generator html encoder code diff json beautifier alle 13 color tools color picker color converter color mixer color hex colors hsl alle 10 string tools string length calculator md5 hash generator sha256 hash generator string reverse url encoder alle 19 code formatters javascript formatter css formatter html formatter json formatter php formatter w3docs durchsuchen k de english en deutsch de русский ru français fr español es português pt italiano it anmelden home tools string functions rot 13 transformer string functions rot 13 transformer apply the classic rot 13 cipher letters shift by 13 positions other characters are left alone source result clear copy submit about rot 13 rot13 rotate by 13 is a substitution cipher that shifts every letter 13 places through the alphabet wrapping z back to a because the latin alphabet has 26 letters and 13 is exactly half of that applying rot13 a second time undoes the first the same operation both encodes and decodes this tool takes whatever text you paste shifts each a z and a z character by 13 positions and leaves everything else digits punctuation spaces accented letters emoji exactly as it was under the hood the transform is a single regex replace input replace a za z g ch matches each letter reads its code with charcodeat picks a base of 65 for uppercase or 97 for lowercase then computes code base 13 26 base and converts back with string fromcharcode the 26 wraps the shift at the end of the alphabet instead of spilling into unrelated unicode ranges this matches php s built in str_rot13 byte for byte so output is interchangeable between the two everything runs in your browser no request is sent so pasted text never leaves your machine rot13 is not encryption it provides no real confidentiality since knowing the algorithm or simply running the text through again instantly reverses it its actual use is obscuring text that shouldn t be immediately visible on the page spoilers puzzle solutions and joke punchlines on forums and wikis a convention going back to usenet it s also handy for generating a reversible test string that isn t plain text or for decoding rot13 d content someone else posted if you need to actually protect data rather than just obscure it reach for a real cipher such as aes instead examples encode then decode by resubmitting text input hello rot13 world output uryyb ebg13 jbeyq input uryyb ebg13 jbeyq output hello rot13 world this is the tool s own placeholder pair paste the output back into the source box and submit again to get the original text back shifting by 13 twice is a full 26 letter loop back to the start the transform as a standalone js function js function rot13 input return input replace a za z g ch const code ch charcodeat 0 const base code 97 97 65 return string fromcharcode code base 13 26 base rot13 attack at dawn nggnpx ng qnja this is what the tool runs client side only a za z characters match the regex and get shifted digits spaces and punctuation fall through untouched same result from php s str_rot13 php echo str_rot13 attack at dawn nggnpx ng qnja php ships rot13 as a built in with identical a z a z only behavior so output matches this tool exactly useful when checking a php backend against it frequently asked questions is rot13 a form of encryption no rot13 is obfuscation not encryption it uses no key and anyone who knows it s rot13 or just runs the text through again reads it instantly use it to hide text from a casual glance not from anyone who actually wants to read it why does rot13 use a shift of 13 specifically 13 is exactly half of the 26 letter alphabet so shifting twice 13 13 26 lands back on the original letter that makes rot13 its own inverse a shift of any other size would need a different amount to undo it does rot13 affect numbers spaces or punctuation no only the letters a z and a z are shifted digits punctuation whitespace and non latin characters pass through unchanged abc123 becomes nop123 the 123 stays exactly as typed how do i decode a rot13 string run it through rot13 again encoding and decoding are the same operation paste the ciphertext into this tool and click submit to get the plaintext back is rot13 the same thing as base64 no base64 re encodes bytes into a 64 character alphabet changing both the character set and the string s length rot13 only rotates letters in place so the output stays the same length and case pattern as the input related tools base 64 encoder another reversible text transform but one that changes the character set and length unlike rot13 which only shifts letters string reverse a different classic text scrambling transform also fully reversible by re running it phrase encryptor need real confidentiality instead of obfuscation aes gcm encryption with a passphrase done in the browser all string functions browse the full set of string tools learn more lesson javascript strings covers charcodeat the method this transform uses to read each letter s code lesson javascript regexp methods string replace with a regex and a function callback the exact pattern this transform s replace call uses all string functions w3docs kostenlose tutorials beispiele übungen snippets und quizze für das web seit 2014 bücher html lernen css lernen javascript lernen git lernen java lernen php lernen python lernen üben übungen quizze probier editor tools html editor password generator html encoder code diff json beautifier unternehmen über uns kontakt datenschutzrichtlinie sprache english deutsch русский français español português italiano 2026 w3docs alle rechte vorbehalten für entwickler gemacht