All about CRT Files

The CRT file type is primarily associated with OpenSSL.

CRT	File extension: CRT
	File type:	security certificate

What is a CRT file?

CRT files mostly belong to OpenSSL by OpenSSL. A CRT file is an X.509 public key certificate for authenticating data transferred over HTTPS (HyperText Transfer Protocol Secure). The CRT certificate is usually saved as Base64-encoded data representing the hostname, organization, and other basic information of an entity. A CRT file is similar to a PEM or CER file. X.509 public certificate standard is defined by the International Telecommunication Union. Another type of CRT file contains terminal settings used by Oracle Database. CRT is also the filename extension of a crontab (cron table) containing a scheduled job/task to be executed by cron.

How to open a CRT file

You need a suitable software like OpenSSL to open a CRT file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CRT file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CRT file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CRT Text Viewer

Choose your .crt file to view

or drag and drop it here

Online File Viewer

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How to extract texts from CRT files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

1. Just click the "Choose your .crt file to view" button on this page.
2. After your file is opened in browser,
3. click "Save as..." in the menu.
4. Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
5. Your file will be converted and downloaded.

CRT file format:

If you can determine the file format, the associated program can also be determined. The file format can be determined based on the file extension and the signature (the first few characters of a file). However, different programs can use the same file extension, and file extensions can be assigned incorrectly. Knowledge is power - this also applies when dealing with unknown or faulty files. Our analysis of the CRT files produces the following result:

CRT is a very widely used file extension. The file type uses a standardized format supported by many programs. However, the following two file formats are common:

• 85% of all CRT files are based on the well-known certificate file format. A digital certificate is a unique, digitally signed document which authoritatively identifies the identity of an individual or organization. Using public key cryptography, its authenticity can be verified to ensure that the software or website you are using is legitimate. The content consists of readable text data, which can be read using a text editor. CRT files can be up to 210 KB in size, but are often around 1 KB - 2 KB. The file type was developed only in the last few years. The following keywords are characteristic: ----BEGIN CERTIFICATE----. A usual file name is certificate.crt or ca_bundle.crt. Such files sometimes refer to bundle, cert, cabundle, services, root, secure, aaacertificate and validation.
• 1% of all CRT files use the same file format, which have the signature NATURAL DRAFT COOLING TOWER: TRIPLE CLUSTER - EXAMPLE. These files contain text and words, not binary data. The file size is in the range of 20 KB to 56 KB. Several words can almost always be found in the files, e.g. Cartesian Coordinate Format, Coordinate Format, ANNUAL; Cartesian, NATURAL DRAFT COOLING TOWER: TRIPLE CLUSTER - EXAMPLE USING NRC SURFACE MET. DATA, PLUME, TABLE, ENERGY, LOSS, DEPOSITION and SOLAR. A usual file name is TotSlrLss.crt or PlmLenFrq.crt.

All the rest of the CRT files (14%) have different formats, frequently e.g. X.509v3 security certificate, Security Certificate, C64 Cartridge image, LINEAR, MII and CIRCULAR. Sometimes used for server, sectigorsadomain, client, usertrustrsaaaaca, authority or star. If you want to find out what your CRT file contains, drag and drop it onto this page.