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Generate or Buy

Self-hosting your Documenso instance requires your own certificate to sign documents. This article explains why. When it comes to certificates, you have two options:
  • generate your certificate
  • buy one from the Certificate Authority (CA)

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Generating A Certificate

If you don’t have special requirements for the signature of your signed documents, you can use a self-generated (self-signed) certificate. The main drawback is that mainstream PDF readers like Adobe won’t recognize the signature as a trusted source or show a green checkmark. The certificate will still include your company/personal data to prove your Documenso instance signed the document. It also guarantees that the document wasn’t altered after signing. You can generate your signing certificate by following this guide.

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Buying a Certificate

If you want more “officially backed” (for lack of a better word) signatures, you will need to buy a certificate from a CA (Certificate Authority). If you want a green checkmark in Adobe PDF, you will need a vendor trusted by Adobe. Check out all Adobe vendors with a green checkmark for the signature on the Adobe Trust List. If you are based in Europe, it might make sense to go with a European one, though there is no hard requirement. While the pricing can vary from vendor to vendor, the certificate’s properties don’t. The usual case would be a corporate certificate detailing the company’s name to which it was issued.

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Technical Process

Receiving your signing certificate is similar to receiving an SSL certificate. Since you need the actual certificate as part of the Documenso config, you must generate a secret private key and a CSR (Certificate Signing Request).
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Generate a private key
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Generate a private key (on a secure machine or in an HSM, depending on your security needs and the provider’s requirements).
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Create a CSR
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Have the Certificate Authority sign the Certificate Signing Request.
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Configure Documenso to use the certificate
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Configure your instance to use the new certificate by configuring the following environment variables in your .env file:
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Environment VariableDescriptionNEXT_PRIVATE_SIGNING_TRANSPORTThe transport used for document signing. Available options: local (default), gcloud-hsmNEXT_PRIVATE_SIGNING_PASSPHRASEThe passphrase for the local file-based signing transport. This field is optional.NEXT_PRIVATE_SIGNING_LOCAL_FILE_PATHThe local file path to the .p12 file to use for the local signing transport. This field is optional.NEXT_PRIVATE_SIGNING_LOCAL_FILE_CONTENTSThe base64-encoded contents of the .p12 file to use for the local signing transport. This field is optional.NEXT_PRIVATE_SIGNING_GCLOUD_HSM_KEY_PATHThe Google Cloud HSM key path for the gcloud-hsm signing transport. This field is optional.NEXT_PRIVATE_SIGNING_GCLOUD_HSM _PUBLIC_CRT_FILE_PATHThe path to the Google Cloud HSM public certificate file to use for the gcloud-hsm signing transport. This field is optional.NEXT_PRIVATE_SIGNING_GCLOUD_HSM _PUBLIC_CRT_FILE_CONTENTSThe base64-encoded contents of the Google Cloud HSM public certificate file for the gcloud-hsm signing transport. This field is optional.NEXT_PRIVATE_SIGNING_GCLOUD_ APPLICATION_CREDENTIALS_CONTENTSThe Google Cloud Credentials file path for the gcloud-hsm signing transport. This field is optional.