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Digitally Sign a PDF

Apply a real cryptographic signature — any edit made after signing will show the document as modified. This is different from the Sign PDF tool, which draws a signature image on the page.

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Click to upload or drag and drop a PDF here

Generate a signing certificate for me Use my own certificate (.p12/.pfx)

Your name

Your email

This creates a fresh, single-use self-signed certificate — proves the document wasn't altered after signing, but PDF viewers will show your identity as "not verified by a trusted authority" since it isn't issued by a CA.

Reason for signing (optional)

Location (optional)

How digital signing works

Upload your PDF.
Either let us generate a certificate for you, or upload your own .p12/.pfx.
Click "Sign PDF" and download the signed file.

Frequently asked questions

How is this different from "Sign PDF"?

The Sign PDF tool draws a picture of a signature onto the page — visually convincing, but not cryptographically meaningful. This tool applies a real PKI signature: if anyone edits the document afterward, PDF viewers will flag the signature as invalid.

Will it show a green "verified" checkmark?

Only if you upload your own certificate from a trusted Certificate Authority. A generated self-signed certificate proves integrity (untampered since signing) but not identity, unless the recipient already trusts that specific certificate.

Is my certificate password stored?

No — it's used only in memory for that one request and never written to a database or log.