Read a pasted PEM certificate without sending it anywhere

Administrators and security teams use it during a review to read the issuer, validity and key details of a PEM certificate.

Read a pasted PEM certificate without sending it anywhere. No registration is needed to obtain a clear output that is ready for real work.

How to use

Paste the certificate in PEM format into the designated field, including the begin and end lines.
Check that the text starts with the header line and ends with the footer line without extra characters.
Click the decode button to start analysing the certificate.
Read the result, which presents key fields such as the issuer, validity and subject.
Use this information for a technical review, without sharing it unnecessarily.

Example

The sample input contains a complete PEM certificate. After decoding, the result shows the structured details of the certificate. This lets you quickly check the issuer and validity period without transmitting the file.

Limits and formats

The tool reads the certificate content, but does not verify the trust chain or signature.
It also does not check revocation or matching with a private key.
The certificate must be in PEM format and correctly pasted, without truncation.
A valid certificate may have expired; check the displayed dates.

Where processing happens

Certificate decoding is performed in your browser. The pasted text does not leave your device and is not stored. No data is sent outside.

Frequently asked questions

What is a PEM certificate?

It is a text format that contains a certificate encoded in base64, delimited by a begin line and an end line. It is often used for web servers and secure exchanges. The tool reads this format to display the fields.

Can the tool check if the certificate is trustworthy?

No, it only decodes and displays the information. Trust depends on the certification chain, the issuing authority and revocation. For full validation, use a specialised tool.

What should I do if decoding fails?

Check that the certificate starts and ends with the correct lines and contains no extra spaces. Make sure the text is complete. If the problem persists, the certificate may be corrupted or in another format.