證書加密與簽名
使用非對稱公鑰證書加密 PDF，配合 3D 實體黃金火漆按壓蓋印及 PKCS#7 數字證書簽名。
物理签名与证书加密选项
拖放PDF文件到此处以放置3D火漆印章及证书锁。
上传待保护PDF
關於此工具
Cert Cryptor encrypts a PDF for a named recipient using their certificate, so only that holder's private key can open the file. This is envelope encryption for documents that must travel safely to a single, intended reader. Unlike password encryption, there is no shared secret to transmit and no passphrase that can be intercepted or forgotten.
Finance and legal departments exchange contracts whose recipients are authorized by certificate, eliminating the ritual of sharing and resetting passwords. Medical records staff protect sensitive patient files so only the named physician's key opens them. Anyone who must guarantee that the single intended reader, and only that reader, can open the file benefits from certificate-based access. The recipient's certificate is all you need, and the encryption keys stay fully under your control rather than with a hosted service.
Encryption for the certificate is performed locally in your browser, so the document and the recipient's certificate never touch a server. Keep the recipient's public certificate on hand and store your own private key securely. Free, no account, and recipient-specific security for documents that need to travel.
Practical guidance before you use 證書加密與簽名
Best for real document workflows
Use 證書加密與簽名 when you need a quick browser-based result without creating an account or sending routine documents through an unnecessary upload workflow. Diplomas and Certificates is a common example: Affix highly-valued 3D wax seal badges to digital diplomas and awards, backed by genuine digital signatures.
Privacy and file handling
EasyPDFNex prioritizes local processing in your browser. That means supported PDF operations run on your device, not in a public cloud queue. For sensitive files, review the output before sharing it, close the browser tab after downloading, and avoid processing documents you are not authorized to edit.
Quality checks after processing
After you download secured pdf, open the result and check page order, text readability, signatures, links, and form fields. If the source file is scanned, encrypted, very large, or damaged, try a related workflow such as encrypt pdf, sign pdf, timestamp pdf before repeating the task.
Start with a clean source file whenever possible. For 證書加密與簽名, the first step is usually "Upload PDF and Cert": Add your PDF and import your signing certificate (.pfx) or the recipient's public certificate (.cer). This simple preparation step prevents most failed exports, missing pages, and formatting surprises.
Editorial review note
This guidance is maintained by the EasyPDFNex editorial team and reviewed for practical PDF workflow accuracy. Tool pages are written to explain when a feature is useful, what to check before download, and where browser-based processing has limits.
使用方法
Upload PDF and Cert
Add your PDF and import your signing certificate (.pfx) or the recipient's public certificate (.cer).
Place the 3D Stamp
Drag and locate the seal on the document preview, and pick a wax style (e.g., gold, crimson).
Press and Sign
Click execute to watch the 3D wax-seal imprint ceremony, generating a physical-grade digital signature.
Download Secured PDF
Save the output document, now cryptographically locked and stamped.
使用場景
Diplomas and Certificates
Affix highly-valued 3D wax seal badges to digital diplomas and awards, backed by genuine digital signatures.
Confidential Agreements
Lock sensitive contracts using the client's public certificate so that only their secure physical keycard can unlock it.
Official Press Releases
Digitally sign public announcements to prevent malicious text edits or spoofing.
常見問題
Is the wax seal just an image or a real signature?
Both. The system renders an incredibly realistic 3D wax imprint with normal-mapped depth (visual layer) and encodes an authentic, tamper-proof PKCS#7 cryptographic signature inside the PDF (data layer).
What is "Certificate-based Encryption"?
It is a passwordless encryption technique. You encrypt the file using the recipient's public key. The reader automatically searches for their local private certificate to decrypt the file seamlessly, ensuring robust security.
Can I customize the stamp design?
Yes. We provide multiple designs like the EasyPDFNex watermark or a Royal crest, and you can adjust the wax melting radius and normal-map indentation depth in the panel.