Decode X.509 Certificate

About This Spell

With a wizard's whisper, Parse PEM/DER X.509 certificates and display key details including Subject, Issuer, validity period, serial number, and Subject Alternative Names.

How to Cast the Spell:

Use your magic to Paste your certificate in PEM or DER format.
Use your magic to Click Decode to view fields.

What is Cert Decoder?

Cert Decoder is a free developer assistant from WizardOfAZ. Use it to work with developer payloads using flexible options as part of your debugging and prototyping, without installing extra software.

Because everything happens locally in your browser, your code and credentials stay under your control while you work with developer payloads using flexible options.

Popular ways to use Cert Decoder

Streamline debugging and prototyping by using Cert Decoder to work with developer payloads using flexible options.
Share deliverables faster—processed developer payloads are ready for download in seconds.
Combine Cert Decoder with other WizardOfAZ tools to keep complex workflows in one browser tab.

Examples and workflow tips

Upload a sample file, cast the spell to work with developer payloads using flexible options, and download the processed result instantly.
Bookmark the Cert Decoder in your browser so recurring tasks stay only one click away.
Share the spell with teammates who need a quick, no-install way to work with developer payloads using flexible options.

Frequently asked questions

Is the Cert Decoder secure?

Yes. The Cert Decoder runs entirely in your browser, which means your code and credentials never leave your device.

What can I do with the Cert Decoder?

You can debugging and prototyping by processing developer payloads without uploading them to an external service.

Can I use Cert Decoder on mobile?

Yes. WizardOfAZ tools are responsive, so you can launch the spell on desktops, tablets, or phones without installing extra apps.

Related tools to explore

Expand your toolkit with other WizardOfAZ spells that complement Cert Decoder:

Base64 Tool — Use it to work with developer payloads using flexible options.
Batch Minifier — Use it to work with developer payloads using flexible options.
CSS Minifier — Use it to work with CSS snippets using flexible options.