{"id":2001,"date":"2025-03-26T10:13:57","date_gmt":"2025-03-26T10:13:57","guid":{"rendered":"https:\/\/cheapsslsecurity.com\/p\/?p=2001"},"modified":"2025-03-26T10:17:15","modified_gmt":"2025-03-26T10:17:15","slug":"differences-between-cer-and-crt","status":"publish","type":"post","link":"https:\/\/cheapsslsecurity.com\/p\/differences-between-cer-and-crt\/","title":{"rendered":"Differences Between .CER and .CRT"},"content":{"rendered":"<h2>Files with the extensions .CER and .CRT refer to X.509 certificates, which are used for encryption and authentication on the Internet.<\/h2>\n<p>Although they contain the same data, the differences between them lie in the encoding format and traditional usage on different operating systems. <\/p>\n<p><!--more--><\/p>\n<h2>What is the difference between .CER and .CRT? <\/h2>\n<h3>1.Coding Format<\/h3>\n<p>Certificates can be presented in two formats: <\/p>\n<ul>\n<li><strong>DER<\/strong> \u2014 binary;<\/li>\n<li><strong>PEM<\/strong> \u2014 text (Base64 with delimiters &#8212;&#8211;BEGIN CERTIFICATE&#8212;&#8211; and &#8212;&#8211;END CERTIFICATE&#8212;&#8211;). <\/li>\n<\/ul>\n<p>Both extensions can contain files in any of these formats. <\/p>\n<h3>2.Traditional Usage<\/h3>\n<ul>\n<li><strong>.CRT<\/strong> &#8211; most used in Linux and Unix-based systems.<\/li>\n<li><strong>.CER<\/strong> &#8211; common in Windows, especially in the Microsoft environment. <\/li>\n<\/ul>\n<p>In practice, both formats can be used interchangeably if the system supports the required encoding. <\/p>\n<h2>How to convert .CRT to .CER and vice versa. <\/h2>\n<p>Sometimes it is necessary to convert one format to another, for example, so that the certificate is correctly recognized on a certain platform. This can be done using any text editor or OpenSSL utility. <\/p>\n<h3>1. Conversion via text editor. <\/h3>\n<p>If the certificate is in PEM format (i.e. it can be opened in a text editor), you can simply change the extension manually. <\/p>\n<ul>\n<li><strong>STEP 1.<\/strong><br \/>\nOpen the certificate.cer (or .crt) file in Notepad, Notepad++, VS Code or another text editor.<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-01.png\" alt=\"open certificate with notepad\" width=\"434\" height=\"466\" class=\"alignnone size-full wp-image-2003 lazyload\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-01.png 434w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-01-279x300.png 279w\" data-sizes=\"(max-width: 434px) 100vw, 434px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 434px; --smush-placeholder-aspect-ratio: 434\/466;\" \/><\/li>\n<li><strong>STEP 2.<\/strong><br \/>\nMake sure the content starts with &#8212;&#8211;BEGIN CERTIFICATE&#8212;&#8211; and ends with &#8212;&#8211;END CERTIFICATE&#8212;&#8211;<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-02.png\" alt=\"copy certificate in notepad\" width=\"434\" height=\"466\" class=\"alignnone size-full wp-image-2004 lazyload\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-02.png 434w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-02-279x300.png 279w\" data-sizes=\"(max-width: 434px) 100vw, 434px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 434px; --smush-placeholder-aspect-ratio: 434\/466;\" \/>\n<\/li>\n<li><strong>STEP 3.<\/strong><br \/>\nSelect &#8220;Save As&#8221;, and enter a new file name, replacing the extension (.cer \u2192 .crt or vice versa).<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-03.png\" alt=\"save file as CRT in notepad\" width=\"975\" height=\"444\" class=\"alignnone size-full wp-image-2005 lazyload\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-03.png 975w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-03-300x137.png 300w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-03-768x350.png 768w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-03-500x228.png 500w\" data-sizes=\"(max-width: 975px) 100vw, 975px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 975px; --smush-placeholder-aspect-ratio: 975\/444;\" \/>\n<\/li>\n<li><strong>STEP 4.<\/strong><br \/>\nIn the &#8220;Save as type&#8221; field, select &#8220;All files&#8221; to avoid the automatic addition of .txt.<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-04.png\" alt=\"file extension selection in notepad during saving\" width=\"975\" height=\"233\" class=\"alignnone size-full wp-image-2006 lazyload\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-04.png 975w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-04-300x72.png 300w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-04-768x184.png 768w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-04-500x119.png 500w\" data-sizes=\"(max-width: 975px) 100vw, 975px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 975px; --smush-placeholder-aspect-ratio: 975\/233;\" \/><\/li>\n<li><strong>STEP 5.<\/strong><br \/>\nClick &#8220;Save&#8221;.<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-05.png\" alt=\"save file in notepad\" width=\"975\" height=\"233\" class=\"alignnone size-full wp-image-2007 lazyload\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-05.png 975w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-05-300x72.png 300w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-05-768x184.png 768w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/cer-crt-diff-05-500x119.png 500w\" data-sizes=\"(max-width: 975px) 100vw, 975px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 975px; --smush-placeholder-aspect-ratio: 975\/233;\" \/><\/li>\n<\/ul>\n<p>This method is only suitable for certificates in PEM format. If the file is DER encoded, it must be converted via OpenSSL. <\/p>\n<h3>2. Conversion via OpenSSL.<\/h3>\n<p>You can use the OpenSSL utility to convert certificates. <\/p>\n<p><strong>Convert .CRT to .CER<\/strong><\/p>\n<ol>\n<li>If the certificate is encoded in PEM:\n<div class=\"code-with-bg\"><span>openssl x509 -in certificate.crt -out certificate.cer<\/span><\/div>\n<\/li>\n<li>If you want the binary DER format:\n<div class=\"code-with-bg\"><span>openssl x509 -in certificate.crt -outform der -out certificate.cer<\/span><\/div>\n<\/li>\n<\/ul>\n<p><strong>Convert .CER to .CRT<\/strong><\/p>\n<div class=\"code-with-bg\"><span>openssl x509 -in certificate.cer -out certificate.crt <\/span><\/div>\n<h3>Conclusion<\/h3>\n<p>The .CER and .CRT files are identical and can be used interchangeably depending on the operating system. To convert, you can either rename the file manually (if it is in PEM format) or use OpenSSL to change the encoding format. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Files with the extensions .CER and .CRT refer to X.509 certificates, which are used for encryption and authentication on the Internet. Although they contain the same data, the differences between them lie in the encoding format and traditional usage on &hellip; <a href=\"https:\/\/cheapsslsecurity.com\/p\/differences-between-cer-and-crt\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,4,14],"tags":[],"class_list":["post-2001","post","type-post","status-publish","format-standard","hentry","category-ssl-advanced","category-ssl-basics","category-ssl-error-codes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Differences Between .CER and .CRT - Cheap SSL Security<\/title>\n<meta name=\"description\" content=\"Files with the extensions .CER and .CRT represent X.509 certificates, which are essential for ensuring secure encryption and robust authentication on the Internet.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cheapsslsecurity.com\/p\/differences-between-cer-and-crt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Differences Between .CER and .CRT - 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