Sigil
BundlApps
Self-signed certs in seconds
Screenshots
Included in your subscription
Get Sigil and 78+ other apps for $9.99/month.
About this app
Sigil turns the OpenSSL invocation gauntlet into a focused certificate workbench. Compose a complete subject DN, attach SAN entries, pick your key algorithm, and forge an X.509 artifact in seconds — locally, offline, and fully inspectable. Generated certs land as a structured passport page with SHA-256 fingerprint visualization and a two-step private-key reveal that never leaks by accident.
Key features
- X.509 v3 certificate + private key in one click
- RSA 2048 / 3072 / 4096-bit key options (no system OpenSSL required)
- Full Subject DN editor: CN, O, OU, country, state, locality, email
- Subject Alternative Names — DNS, IP, email, and URI entries
- Extended Key Usage flags for serverAuth, clientAuth, code signing, email, timestamping
- Generated artifact panel with fingerprint visualization and inspectable PEM
- Two-step key reveal — private key never copied without explicit consent
Ratings & reviews
Sigil is exactly what I was looking for. Lightweight, fast, and does the job without unnecessary bloat. Highly recommend.
Been using Sigil daily for a few weeks now. The interface is clean and intuitive. Great addition to the BundlApps catalog.
Switched to Sigil from a paid alternative and honestly prefer it. Runs locally, no account needed, just works.
What's new
Bug fixes and performance improvements.
Additional information
How to get Sigil
Install BundlApps
Download the free installer for Windows. Takes under a minute.
Find Sigil
Search the catalog or browse Developer apps. Click to install instantly.
Start using it
Runs locally, no account needed inside the app. Your files stay on your machine.