DER Converter

Extract text from DER files


Drop or upload your .DER file
✈

How to extract text from your DER file

  1. Click the "Select File" button above, and choose your DER file.
  2. You’ll see a preview, if available.
  3. Click the "Convert file to..." button to extract text information.

Convert DER to another file type

To convert your DER file to another format, you need OpenSSL or other System software.

  • DER to PEM
  • DER to CER
  • DER to JKS
  • DER to HTML
  • DER to HTM
  • DER to CSS
  • DER to JS
  • DER to PHP
  • DER to ASP
  • DER to ASPX
  • DER to JSP
  • DER to JSPX

Convert a file to DER

To convert other file formats to the "PKI Certificate" file type, you need software like OpenSSL or a similar tool.

  • RSS to DER
  • CSS to DER
  • CGI to DER
  • SITEMAP to DER
  • PL to DER
  • WEBMANIFEST to DER
  • JSON to DER
  • JS to DER
  • XML to DER
  • HTML to DER
  • ICO to DER
  • HTM to DER

About DER files

The .DER file type contains an X.509 digital certificate encoded using the ASN.1 Distinguished Encoding Rules. It is the binary sibling of the more common, text-based PEM format. While highly efficient for storage and Java applications, the .DER format is a common issue for system administrators and developers: because it is binary data, you cannot open it in a text editor (like Notepad or Vim) to view details, nor can you copy-paste the certificate content into web server configurations (like Nginx or Apache HTTP Server) that typically expect Base64 ASCII headers (e.g., -----BEGIN CERTIFICATE-----).

To ensure compatibility with cloud platforms (like AWS or Azure), email servers, and web infrastructure, users typically convert .DER files to PEM (for text editing and server config), CRT (for broad OS recognition), or TXT (for debugging).

Convert.Guru analyzes your DER file, detects the exact format, and lets you read the text inside.

Users also converted CER, PEM, CRT, CERT, TXT, ZIP, PDF, DAT, INDD, BIN, ASPX, P7B and JKS files.



The DER Converter Story

The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our DER converter.