[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"howto:csr:ios:en":3},{"resolvedFromAlias":4,"canonicalExt":5,"ext":5,"name":6,"category":7,"categoryName":8,"updatedAt":9,"os":10,"osLabel":11,"quickSolution":12,"stepByStep":13,"recommendedSoftware":15,"alternativeMethods":16,"commonIssues":17,"securityNote":36,"extensionPath":37,"extensionLabel":38,"breadcrumbs":39,"metaDescription":49},false,"csr","PKCS #10 Certificate Signing Request","certificates","Certificates","2026-06-12T08:14:09.409Z","ios","iOS","To open .CSR files on iOS, there is no widely standard, built-in way to inspect PKCS #10 .csr files on iOS; transfer the file to a Mac/PC and use OpenSSL to view it.",[14],"There is no widely standard, built-in way to inspect PKCS #10 .csr files on iOS; transfer the file to a Mac/PC and use OpenSSL to view it.",[],[],[18,24,30],{"title":19,"description":20,"steps":21},"OpenSSL says it cannot load the request (wrong format or encoding)","CSRs are commonly PEM (text with BEGIN/END lines) or DER (binary). If the file’s encoding doesn’t match what the tool expects, parsing can fail.",[22,23],"Open the .csr in a text editor: if you see a header like \"-----BEGIN CERTIFICATE REQUEST-----\" it is PEM; if it looks like binary, it may be DER.","For PEM, use: openssl req -in file.csr -noout -text. For DER, try: openssl req -inform DER -in file.csr -noout -text.",{"title":25,"description":26,"steps":27},"CSR is missing the expected domain/SAN information","A CSR includes the subject and may include requested extensions (commonly subjectAltName). If those fields were not included at generation time, the CA may issue a certificate that doesn’t match what you intended.",[28,29],"Inspect the CSR with: openssl req -in file.csr -noout -text and look for Subject and any requested extensions.","If required names are missing, regenerate the CSR with the correct parameters in your CSR generation tool (for example, using OpenSSL’s req command).",{"title":31,"description":32,"steps":33},"The CA rejects the CSR or the signature check fails","A PKCS #10 CSR is signed with the private key corresponding to the included public key. If the CSR was corrupted during copy/paste, line-wrapped incorrectly, or otherwise altered, the signature may not validate.",[34,35],"If you copied the CSR through email or a web form, re-export the CSR from the source system as a file and avoid manual reformatting.","Validate/display it again with OpenSSL: openssl req -in file.csr -noout -text; if parsing fails, regenerate the CSR from the original key pair.","A CSR contains a public key and identifying information, but it should not contain the private key. If you ever receive a “CSR” file that includes private key material, treat it as a key-compromise incident and replace the key pair.","/file-extension/csr",".CSR",[40,43,46],{"label":41,"to":42},"Home","/",{"label":44,"to":45},"How To","/file-extension",{"label":47,"to":48},"Open .CSR on iOS","/how-to/open-csr-on-ios","Learn how to open .CSR files on iOS with step-by-step instructions, recommended software, and troubleshooting tips."]