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Learn how to sign a PDF document with a certificate-based digital signature in docHub. Download docHub for free from its official website. To sign a document, you need a digital ID containing your name, email, issuer information, serial number, and expiration date. In docHub, digital IDs are used to sign or seal documents. Follow steps to add or create a digital ID, such as selecting digital IDs in preferences, then adding a new ID or uploading an existing one from your organization. Fill in your personal information to create a new digital ID for signing documents.