Digitally Sign a PDF
Use your own password-protected PKCS#12/PFX certificate to create a cryptographic PDF signature.
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Your signing certificate is processed by this service. See Privacy & security.
How to use Digitally Sign a PDF
Use MallowShare’s Digitally Sign a PDF workspace when you need to work with a file directly in your browser. The steps below describe what to check before sharing or downloading the result.
- Choose a PDF and a certificate you are authorized to use.
- Enter the certificate password in the signing form and submit the PDF for signing.
- Download the signed PDF, then check certificate trust and signature status in a PDF viewer.
What to check before you download
A signed file can contain a valid cryptographic signature while its issuing certificate remains untrusted.
Keep a copy of your source file until you have opened and checked the exported result.
Digitally Sign a PDF — common questions
Can I use a self-signed certificate?
A self-signed certificate may sign the document, but recipients might see an untrusted-signer warning.
Does the website need my certificate password?
This workflow processes the uploaded certificate and password on the server. Use only a trusted HTTPS deployment and a certificate you are authorized to use.