About Certificate Decoder
Certificate Decoder is a no-nonsense utility for engineers and technical marketers. Decode a PEM certificate to read its subject, SAN, validity and algorithm. Give it your text and it returns a metric breakdown — no sign-up, no ceremony.
Everything is analysed locally in your browser. Your text is never uploaded, which makes this safe to use on unpublished drafts, client work and anything under NDA.
Certificate Decoder is included on Professional and above. Every run counts against your plan's credit allowance, and results are saved to your history so you can return to them or attach them to a client report.
How to use Certificate Decoder
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1
Enter your text
Paste your text into the workspace. The live counter shows characters and words as you type.
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2
Set your options
Adjust the settings to match your use case. Defaults are chosen to be sensible for most people, so you can usually skip this step.
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3
Run the tool
Press Run. Progress is shown while it works, and most runs finish in under two seconds.
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4
Review the result
Scan the metric cards for anything outside the expected range.
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5
Export or share
Copy to clipboard, download the raw output, export to PDF, CSV or JSON, or share a link to this tool with your team.
Example
You enter
You get back
Features
Runs locally
Your text never leaves the browser, so it is safe for drafts and client work.
Plain-language metrics
Each value comes with context, not just a number.
Fast by default
Most runs complete in well under two seconds, with live progress while it works.
Export anywhere
Copy to clipboard or export to PDF, CSV, JSON or plain text in one click.
Privacy-aware
Anything that can be computed in your browser is — nothing is uploaded unless the job genuinely needs a server.
Saved to your history
Every run is stored on your account so you can revisit it or attach it to a report.
Why teams use it
Stop paying for a single-purpose tool
Certificate Decoder is one of 312 tools on the same account. One subscription replaces the handful of point solutions most developer teams end up stacking.
Get to the decision faster
The output is structured around what you will do next, not around what was easiest to measure. Less interpretation, fewer meetings.
Share results without a screenshot
Export to PDF or CSV, or send a link. Clients and colleagues see the same thing you do, formatted properly.
Works the same on every device
The full workspace — including tables and exports — works on a phone, a tablet and a 4K display without a separate app.
Certificate Decoder — frequently asked questions
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