PDF Digital Signature (PAdES)
Cloud Processing (Encrypted)Apply PAdES digital signatures to PDFs via server-side pyHanko, with RFC 3161 trusted timestamping and PAdES LTA readiness check (signature, signature timestamp, DSS evidence, document timestamp).
How this tool works (no sign-up needed)
- Upload your file above. Each tool shows whether it runs Local (in your browser) or Cloud (encrypted servers).
- Adjust options, then click the Run / Convert / Process button.
- Wait for progress, then download the result. Use Next tools to continue.
If buttons are not visible, enable JavaScript — the interactive workspace loads in your browser.
Server-side signingPAdES digital signing with pyHanko (MIT)
Supports application/pdf
Adopt a visual signature (draw, type, or upload) and click where it should land — the finalized image is stamped onto the PDF exactly as previewed. Skip it for an invisible cryptographic signature.
Signing happens on our server: by default with the platform's self-signed demo certificate, or with your own PEM certificate and key (this request only, never stored). Post-signing verification uses a server-side validator; RFC 3161 timestamps (.tsr) are independent tokens — the digest is computed locally and its ownership checked, no certificate-chain validation.
What is it?PDF Digital Signature (PAdES) is a PDFLean security & privacy tool: Apply a PAdES digital signature to a PDF via server-side pyHanko with a configured certificate, including signing reason and location. Legal validity depends on certificate type and applicable jurisdiction.
TL;DR: Apply a PAdES digital signature to a PDF via server-side pyHanko with a configured certificate, including signing reason and location. Legal validity depends on certificate type and applicable jurisdiction. Files are transferred over an encrypted channel, automatically deleted within 24 hours, and never used for AI training; requires a configured server-side certificate and pyHanko command.
About this tool
Apply a PAdES digital signature to a PDF via server-side pyHanko with a configured certificate, including signing reason and location. Processing runs on encrypted cloud infrastructure, with files automatically deleted within 24 hours and never used for AI training. The workflow is deliberately short: load the file, choose the options on the page, run the operation, and save the result. Every choice is applied before the file is written, so re-running with different settings takes seconds. Practical limits apply (see the on-page limits), and it pairs well with the related tools linked beside this page when one step is not the whole job. Key facts — Processing: encrypted cloud; Access: free with no account required; File limits: see the on-page limits; Privacy: encrypted in transit, deleted within 24 hours, never used for AI training.
How to use
Upload a PDF (optionally set reason/location)
Click "Digital signature"
Download the signed PDF
FAQ
Is my file safe?
Files are transferred over an encrypted channel, automatically deleted within 24 hours, and never used for AI training.
Are there any limits?
Requires a configured server-side certificate and pyHanko command; for handwritten touch signatures, please use the Sign & Stamp tool.
Is the protection strong enough?
Files are transferred over an encrypted channel, automatically deleted within 24 hours, and never used for AI training. Signatures adhere to the PAdES specification; legal validity depends on the certificate type and applicable jurisdiction.
Can I process multiple files in bulk?
A single tool page handles one task at a time; for bulk work use the Batch Processing workflow and add this tool as a step to run a whole set at once.
Is the processed file still editable?
The output remains a standard PDF that opens in any viewer. Any subsequent modifications will invalidate the digital signature or trigger a tamper warning.