What is the difference between .crt and .pem?

Both are extensions for X.509 certificates. .pem always means Base64 text between BEGIN/END markers. .crt is common on Linux and with Apache/Nginx and is usually PEM already, but some CAs and Windows exports use .crt for binary DER. This converter accepts both and outputs PEM.

What is the OpenSSL equivalent?

openssl x509 -inform der -in certificate.cer -out certificate.pem converts a DER certificate. This converter produces the same PEM: the certificate Base64-encoded in 64-character lines between BEGIN/END CERTIFICATE markers.

Can I convert a private key with this tool?

No, and you should never upload a private key to an online tool. Certificates are public by design, so converting them is safe; private keys are not.

How do I convert CRT to PEM?

Upload your CRT file above, click Convert, and download the PEM result instantly. No account or software needed.

Is converting CRT to PEM free?

Yes. It is free and unlimited for files up to 5 MB, with no account required. Larger files get 3 free conversions per day; beyond that, credit packs start at $1 and credits never expire.

Are my files stored or shared?

No. Files are processed in server memory and deleted immediately after conversion. Nothing is written to disk or retained.

Do I need to install anything?

No software installation needed. OmniConvert runs in the browser — just upload, convert, and download.

OmniConvert

Convert CRT to PEM

Free

Free and unlimited

For files up to 5 MB. No account needed. Larger files: 3 free per day.

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About this conversion

Convert a .crt certificate (DER or PEM encoded) to a PEM file. This converter processes your CRT file server-side and returns a PEM file instantly — no account, no software installation, and no file storage. Files are deleted from our servers immediately after conversion.

Learn more: PEM / DER / CER / CRT file format explained

How to convert CRT to PEM

1. Upload — drag your CRT file onto the converter above, or click to browse.
2. Convert — press Convert. Processing happens on secure servers in seconds.
3. Download — your PEM file downloads automatically. No sign-up required.

Convert CRT to PEM from the command line

curl --fail-with-body \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -F "file=@input.crt" \
  -F "conversionId=crt-to-pem" \
  https://www.omniconvert.cloud/api/convert -o output.pem

The API needs a token from a credit pack, and each API conversion uses one credit. Converting on this page stays free. API documentation

Frequently Asked Questions

What is the difference between .crt and .pem?: Both are extensions for X.509 certificates. .pem always means Base64 text between BEGIN/END markers. .crt is common on Linux and with Apache/Nginx and is usually PEM already, but some CAs and Windows exports use .crt for binary DER. This converter accepts both and outputs PEM.
What is the OpenSSL equivalent?: openssl x509 -inform der -in certificate.cer -out certificate.pem converts a DER certificate. This converter produces the same PEM: the certificate Base64-encoded in 64-character lines between BEGIN/END CERTIFICATE markers.
Can I convert a private key with this tool?: No, and you should never upload a private key to an online tool. Certificates are public by design, so converting them is safe; private keys are not.
How do I convert CRT to PEM?: Upload your CRT file above, click Convert, and download the PEM result instantly. No account or software needed.
Is converting CRT to PEM free?: Yes. It is free and unlimited for files up to 5 MB, with no account required. Larger files get 3 free conversions per day; beyond that, credit packs start at $1 and credits never expire.
Are my files stored or shared?: No. Files are processed in server memory and deleted immediately after conversion. Nothing is written to disk or retained.
Do I need to install anything?: No software installation needed. OmniConvert runs in the browser — just upload, convert, and download.

No account needed · Credits never expire · Share your token link across devices