[New tool] SSL Certificate Format Conversion Tool

[zeng202211]

Clear and concise description of the feature you are proposing

Input Formats: PKCS#12, DER, and PEM.

Output Formats: PEM and DER

Is their example of this tool in the wild?

https://www.lddgo.net/encrypt/cert-format-converter

Additional context

No response

Validations

• [X] Check the feature is not already implemented in the project.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• [X] Check that the feature can be implemented in a client side only app (IT-Tools is client side only, no server).

[sharevb]

Hi @zeng202211 and @CorentinTh , implemented in #1306

[sharevb]

Hi @zeng202211 , implemented: https://sharevb-it-tools.vercel.app/ssl-cert-converter

And if you are interested in an up to date version of it-tools, with many improvements, new tools, and bug fixes, as this repo is almost no more maintained, I made a fork here : https://github.com/sharevb/it-tools (https://sharevb-it-tools.vercel.app/ and docker images https://github.com/sharevb/it-tools/pkgs/container/it-tools)