Certify PDF (digital signature)

Certify PDF (digital signature) is a Pro feature ($5/month flat, free trial) — the everyday tools (merge, split, rotate, organize, watermark, page numbers, image to PDF) stay free with no sign-up, no watermark and no daily limit.

Open Certify PDF (digital signature), drop your file, set the options, and download the result in a few seconds — processed securely, no queue and no ads.

Files are sent over an encrypted connection and deleted automatically after processing. No one else can access them and they are never used for anything but your task.

It applies a PAdES digital signature using your certificate, so a reader can verify who signed the document and prove that not a byte has changed since. A drawn signature is a picture on the page; this is cryptographic evidence.

Yes — the signature is made with your certificate, which is what ties the document to you. Bring one from your certificate authority or your organisation.