Add timestamp to PDF
Add an RFC 3161 timestamp to your PDF using a trusted Time Stamp Authority (TSA).
Quick guide
- Upload your PDF
- Adjust options if needed
- Download the result
Add timestamp to PDF
Add an RFC 3161 timestamp to your PDF using a trusted Time Stamp Authority (TSA).
Add timestamp to PDF
Adding a timestamp to a PDF creates cryptographic proof of when the document existed in its current state — a form of digital notarization that proves document integrity.
The timestamp embeds a digitally signed time record from a trusted authority, confirming the document was not modified after the timestamp was applied.
Used in legal documents, intellectual property filings, contract signing, and any context where proving the exact creation or signing time has legal significance.
Frequently asked questions
Is this tool free?
Yes, Add timestamp to PDF is completely free. No sign-up or account required.
Are my files secure?
Yes. Uploaded files are automatically deleted from our servers after processing. We never store copies of your documents.
What is the maximum allowed file size?
You can upload files up to 50 MB.
Do I need to install anything?
No. The tool works entirely online, directly from your browser, with no installation required.