PEM ⇄ DER Converter
Convert X.509 certificates and keys between PEM and DER — runs 100% in your browser. No data is uploaded; nothing leaves your device.
Reach for PEM ⇄ DER Converter whenever you need to convert X.509 certificates and keys between PEM and DER. Developers and ops teams use it when configuring TLS, converting key material between tools and debugging certificate issues.
How to embed PEM ⇄ DER Converter on your website
Add this free tool to your own site, blog or intranet — it's 100% free to embed. Paste this snippet where you want the tool to appear; it loads a clean, self-contained version with no ads or navigation.
<iframe src="https://tooljolt.com/embed/pem-der-converter" title="PEM ⇄ DER Converter" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy"></iframe>
About PEM ⇄ DER Converter
PEM ⇄ DER Converter is a free online certificate tool that lets you convert X.509 certificates and keys between PEM and DER. It runs entirely in your browser — no sign-up, no uploads and nothing ever sent to a server — so it is fast, private and safe to use with sensitive data. Whether you are a developer, security professional, student or just curious, PEM ⇄ DER Converter gives you an instant, reliable result with zero setup.
How to use PEM ⇄ DER Converter
- 1Paste your certificate, key or CSR into PEM ⇄ DER Converter.
- 2Choose the conversion or action.
- 3It is parsed locally in your browser.
- 4Copy or download the converted output.
Why use PEM ⇄ DER Converter?
- ✓100% free with no sign-up, accounts, watermarks or usage limits
- ✓Runs entirely in your browser — your input never leaves your device, ideal for confidential security data
- ✓Your private key material is never uploaded
- ✓Supports the standard PEM and DER formats
- ✓Works on any device with a modern web browser, online or offline
Frequently asked questions
Is my certificate or key safe in PEM ⇄ DER Converter?+
Yes. PEM ⇄ DER Converter parses and converts everything in your browser — your certificate, CSR or key material is never uploaded, so it is safe to use with private keys.
What formats does PEM ⇄ DER Converter support?+
It works with the standard PEM (base64 text) and DER (binary) encodings used by OpenSSL, web servers and most TLS tooling.
Is PEM ⇄ DER Converter free to use?+
Yes. PEM ⇄ DER Converter is 100% free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.
Does PEM ⇄ DER Converter upload my data to a server?+
No. PEM ⇄ DER Converter runs entirely in your browser using JavaScript — nothing you type or upload ever leaves your device. That makes it safe to use with sensitive or confidential security data.