Guides
Code signing, explained by someone who does it
Working guides for publishers who ship Windows software: signing with signtool, what the SmartScreen warning actually measures, and why the private key has to live in hardware. Every guide names its sources and the date it was last checked.
All guides
The 2023 HSM requirement for code signing, explained
Why you can no longer get a code signing certificate as a .pfx file, what the CA/Browser Forum actually mandated in June 2023, and how cloud signing solves it without a USB token.
Fix "Windows protected your PC" — the developer's guide
What the SmartScreen warning actually measures, why a brand-new code signing certificate does not remove it immediately, and what genuinely shortens the reputation build-up.
Sign an .exe with signtool and a cloud certificate
A working end-to-end walkthrough for signing a Windows executable with signtool and a Certum cloud code signing certificate, including timestamping and verification.
When you are ready to sign
Two products, one year, one price. We check the application before you pay, and refund in full if it cannot be issued.