Remove a certificate-based digital signature from a PDF. A signed document is locked against changes by design, so a file that needs a correction has to have the signature removed first - and then re-signed once the edit is done. Removing it does not forge anything: it deletes the signature and, with it, any claim the document was making about who approved it.
Because a digital signature exists to prove nothing changed after signing. Any edit invalidates it, which is the mechanism working as intended rather than a restriction to work around.
No - the opposite. The signature is gone, so nothing verifies and Validate PDF Signature will report no signatures present.
No. An image added with Sign PDF is page content, not a digital signature. Remove it by redacting the area.
Files are uploaded over an encrypted connection and processed on CoonTool's own server, not in your browser. The working copy is deleted automatically once the job is done, and in any case within 24 hours. Nothing is stored permanently and no account is required.