Is Certificate Sign free to use?

Yes — completely free, with no sign-up and no watermark on the output.

Certificate Sign

Digitally sign a PDF with a certificate file. Free online — no sign-up, no watermark.

FreeNo sign-up No watermark

Protect sensitive documents before you share them. These tools encrypt PDFs, remove restrictions, redact confidential text, scrub hidden metadata and validate signatures — with clear controls over what gets changed.

Accepts .pdf files. This tool uses secure in-memory processing on our server — files are never stored.

How to use Certificate Sign

Upload your file — drag and drop it onto the page or click to browse.
Adjust the tool's options if needed, then run it.
Download the finished file straight to your device.

Frequently asked questions

Is Certificate Sign free to use?: Yes — completely free, with no sign-up and no watermark on the output.
Is my file safe?: This tool uses secure in-memory processing on our server — files are never stored.
What files does Certificate Sign accept?: Accepts .pdf files.

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