Timestamp PDF
Add a signature field recording your device clock time to a PDF. Not a trusted RFC 3161 timestamp: no timestamp authority is contacted.
Upload PDF for TSA Timestamp
About This Tool
Please read before use. This tool adds a signature to your PDF that records the date and time from your own device clock. It does not contact a timestamp authority, so the result is not a trusted RFC 3161 timestamp and does not prove when the document existed.
The signature is made with a certificate generated in your browser at that moment. PDF readers will show it as untrusted, and anyone could produce the same result with a different clock setting. The server name you pick is written into the signature label only; no server is contacted and no data leaves your device.
If you need evidence of when a document existed, use a signing application that requests a timestamp from a qualified or trusted timestamp authority.
How to Use
Add Your PDF
Select the PDF to sign. It is processed in your browser.
Choose a Label
Pick the name that will appear in the signature label. No server is contacted.
Apply and Download
The tool adds a signature with your device clock time and a browser-generated certificate. Download the result.
Use Cases
Internal Drafts
Record an informal signing time on a working copy where no legal or regulatory weight is needed.
Testing PDF Readers
See how PDF readers display a signature field and an untrusted certificate.
Frequently Asked Questions
Is this an RFC 3161 trusted timestamp?
No. No timestamp authority is contacted. The time comes from your device clock and the certificate is generated in your browser, so readers will report it as untrusted.
Can I use it as proof that a document existed on a date?
No. Because the time and certificate come from your own device, it is not independent evidence. Use a signing service that obtains a timestamp from a trusted timestamp authority.
Does anything leave my device?
No. The document, its hash and the signature are all handled in your browser.