{"id":235,"date":"2026-08-21T17:51:44","date_gmt":"2026-08-21T17:51:44","guid":{"rendered":"https:\/\/netguide.io\/tools\/rot13-caesar-cipher\/"},"modified":"2026-08-21T17:51:44","modified_gmt":"2026-08-21T17:51:44","slug":"rot13-caesar-cipher","status":"publish","type":"post","link":"https:\/\/netguide.io\/tools\/en\/rot13-caesar-cipher\/","title":{"rendered":"ROT13 \/ Caesar Cipher"},"content":{"rendered":"<div id=\"netgu-1227152264\" class=\"netgu-before-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"3494115342\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n<style>\n.wp-rot-container { max-width:100%; background:#fff; padding:20px; border:1px solid #ddd; border-radius:10px; font-family:-apple-system, sans-serif; color:#333; }\n.wp-rot-title { margin:0 0 15px 0; color:#2271b1; font-size:1.4rem; }\n.wp-rot-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(140px, 1fr)); gap:12px; margin-bottom:10px; }\n.wp-rot-input-group label { display:block; font-size:11px; font-weight:bold; margin-bottom:4px; text-transform:uppercase; color:#666; }\n.wp-rot-input-group input, .wp-rot-input-group select { width:100%; padding:8px; border:1px solid #ccc; border-radius:4px; box-sizing:border-box; }\n.wp-rot-checkbox-group { margin:15px 0; font-size:12px; display:flex; align-items:center; gap:8px; color:#666; }\n.wp-rot-note { font-size:12px; color:#666; margin-top:12px; min-height:1em; }\n.wp-rot-warn { color:#d63638; font-weight:bold; }\n.wp-rot-results { margin-top:20px; border-top:2px solid #eee; padding-top:15px; }\n.wp-rot-res-item { display:flex; justify-content:space-between; margin-bottom:6px; font-size:14px; gap:10px; }\n.wp-rot-total { font-weight:bold; font-size:18px; color:#2271b1; margin:10px 0; padding:5px 0; border-top:1px solid #eee; border-bottom:1px solid #eee; }\n.wp-rot-val { color:#2271b1; font-weight:bold; }\n.wp-rot-out { width:100%; box-sizing:border-box; padding:10px; border:1px solid #ccc; border-radius:4px; font-family:monospace; font-size:13px; word-break:break-all; background:#f7f7f7; margin-top:6px; }\n.wp-rot-btn { background:#2271b1; color:#fff; border:none; padding:9px 14px; border-radius:4px; cursor:pointer; font-size:13px; margin-top:10px; }\n<\/style><div class=\"wp-rot-container\">\n  <h3 class=\"wp-rot-title\">ROT13 \/ Caesar Cipher<\/h3>\n  <div class=\"wp-rot-input-group\"><label>Text<\/label><textarea id=\"rot-in\" style=\"width:100%;box-sizing:border-box;height:100px;padding:10px;border:1px solid #ccc;border-radius:5px;font-family:monospace;font-size:13px;\" oninput=\"doRot()\">Hello World<\/textarea><\/div>\n  <div class=\"wp-rot-grid\">\n    <div class=\"wp-rot-input-group\"><label>Shift (<span id=\"rot-shift-label\">13<\/span>)<\/label><input type=\"range\" id=\"rot-shift\" min=\"0\" max=\"25\" value=\"13\" oninput=\"doRot()\"><\/div>\n    <div class=\"wp-rot-input-group\" style=\"display:flex;align-items:flex-end;\"><button class=\"wp-rot-btn\" onclick=\"rot13()\">ROT13<\/button><\/div>\n  <\/div>\n  <label style=\"display:block;font-size:11px;font-weight:bold;text-transform:uppercase;color:#666;margin:8px 0 4px;\">Result<\/label>\n  <textarea id=\"rot-out\" style=\"width:100%;box-sizing:border-box;height:100px;padding:10px;border:1px solid #ccc;border-radius:5px;font-family:monospace;font-size:13px;\" readonly><\/textarea>\n  <button class=\"wp-rot-btn\" onclick=\"copyRot()\">Copy<\/button>\n  <div class=\"wp-rot-note\">ROT13 (shift 13) is self-inverse: apply again to decrypt. Only letters are shifted, no real security.<\/div>\n<\/div>\n<script>\nfunction caesar(s,shift){ return String(s).replace(\/[a-zA-Z]\/g,function(c){ var code=c.charCodeAt(0); var base=(code<91)?65:97; return String.fromCharCode(((code-base+shift)%26+26)%26+base); }); }\nfunction doRot(){ var t=document.getElementById('rot-in').value; var sh=parseInt(document.getElementById('rot-shift').value,10)||0; document.getElementById('rot-out').value=caesar(t,sh); document.getElementById('rot-shift-label').innerText=sh; }\nfunction rot13(){ document.getElementById('rot-shift').value='13'; doRot(); }\nfunction copyRot(){ var o=document.getElementById('rot-out'); if(!o.value)return; o.focus(); o.select(); try{navigator.clipboard.writeText(o.value);}catch(e){} }\ndoRot();\n<\/script>\n\n\n<div id=\"netgu-599326967\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- NetGuide.io-After-Widget-Tools -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-6258556257245998\"\r\n     data-ad-slot=\"5175852350\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">ROT13 and Caesar cipher<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Caesar cipher shifts each letter by a fixed number of positions in the alphabet. ROT13 is the special case with shift 13 \u2013 popular for hiding spoilers or solutions.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ROT13:<\/strong> Applying it twice restores the original text (13 + 13 = 26).<\/li>\n\n\n<li><strong>Caesar:<\/strong> Choose any shift from 0 to 25. To decrypt, use a shift of 26 \u2212 n.<\/li>\n\n\n<li><strong>Not a security tool:<\/strong> The cipher is trivial to crack and only serves to obscure.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Related tools<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/tools\/en\/base32-encode-decode\/\">Base32 Encoder \/ Decoder<\/a><\/li>\n\n\n<li><a href=\"\/tools\/en\/base64-encoder-decoder\/\">Base64 Encoder \/ Decoder<\/a><\/li>\n<\/ul>\n\n\n<div id=\"netgu-4211719672\" class=\"netgu-after-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"4559785002\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Encrypt and decrypt text with ROT13 or a Caesar shift \u2013 freely choosable shift. Runs entirely in the browser.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[164],"tags":[],"class_list":["post-235","post","type-post","status-publish","format-standard","hentry","category-decoder-encoder-en"],"brizy_media":[],"_links":{"self":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts\/235","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/comments?post=235"}],"version-history":[{"count":0,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts\/235\/revisions"}],"wp:attachment":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/media?parent=235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/categories?post=235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/tags?post=235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}