Generate your CSD request
Create the signing request for your Certificado de Sello Digital (CSD) without SAT’s Certifica desktop app. Upload your e.firma, confirm your details, and download the signed .sdg to submit in CertiSAT Web plus the .key you keep for stamping. Your private key never leaves your device.
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Frequently Asked Questions
Is my e.firma private key safe?
Yes. Your e.firma, the generated key pair, and the signing all run locally in your browser. Nothing — not your private key, not your password — is ever uploaded to a server.
What are the .sdg and .key files for?
The .sdg is the signed request you upload in CertiSAT Web to obtain the certificate. The .key is the CSD private key, protected by the password you set — keep it, you will use it to stamp invoices.
What do I need to generate a CSD?
You need a valid (non-expired) e.firma. The CSD request is signed with your e.firma right here in your browser, and SAT validates that signature when you submit the .sdg — so an expired e.firma will be rejected. This tool is independent and not affiliated with SAT.
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