Free for personal use

Free IT tools.
Zero data leaving.

Document your infrastructure and convert certificates – right in your browser, no account, no upload, no cost.

View tools Terms of use

Infra Stack

IT infrastructure in layers

A diagramming tool like Visio – but built around layers. Map your entire infrastructure and look at each layer on its own.

  • Create and connect objects by layer model
  • Show and hide layers, filter views with tags
  • Export to draw.io, JSON and PDF report
  • Light and dark mode, four languages

Certificate Converter

X.509 toolkit

Convert, inspect and create certificates, keys and containers – with the matching OpenSSL command for every step.

  • PEM ↔ DER ↔ PKCS#7 ↔ PKCS#12
  • Detect chains, extract root and intermediate certificates
  • Create CSRs with SANs and a new or existing key
  • Inspect contents: validity, extensions, fingerprints

Your data stays with you.

Both tools run entirely in your browser. No files are transferred and no third-party services are loaded.

No upload

Keys, certificates and diagrams never leave your device.

No account

No sign-up, no login, no email address required.

No tracking

No cookies, no analytics, no ads.

Works offline

Download the file, open it locally – done. No server required.

Free. For your personal use.

You may use both tools freely for private, non-commercial purposes.

Allowed

  • Use in your own home network and homelab
  • Learning, experimenting, training
  • Local copies for your own use
  • Sharing the unchanged link with friends

Only by arrangement

  • Use in companies or for clients
  • Reselling or embedding in your own products
  • Publishing modified versions
  • Removing author attributions

Warranty

  • Provided “as is”, without warranty
  • Check results before production use
  • Always keep private keys safe

This summary is not legal advice. Please get in touch for a commercial licence.

Frequently asked questions

Is it really free?

Yes. Private, non-commercial use costs nothing – no trial period and no hidden features.

Where is my data stored?

Only in your browser. Infra Stack keeps diagrams in the browser's local storage and in export files you save yourself. The Certificate Converter stores nothing permanently.

Do I need an internet connection?

No. All libraries are served from this site, nothing is loaded from third parties. You can also save the pages and use them offline.

Can I use the tools at work?

Commercial use requires an arrangement. Feel free to get in touch – a business licence is planned.

Which browsers are supported?

Current versions of Safari, Chrome, Edge and Firefox on desktop and tablet.