Seal PDF Pro
Apply a tamper-evident completion seal to a PDF document. Creates a verifiable evidence package with your identity, intent, and an independent timestamp.
Processed locally in your browser — not uploaded to our servers.
Drop files here or browse
Files stay on your device — never uploaded
Upgrade to seal
This tool requires a Pro plan.
Add a PDF file to get started.
Common questions
Are my files uploaded to your servers?
No. Your files are processed entirely in your browser. They are not uploaded to Filecraft servers. Only a cryptographic hash (32 bytes) is sent to a timestamp authority for independent time verification.
What is an evidence package?
An evidence package is a ZIP file containing your original document, a sealed manifest with your identity and intent, a cryptographic seal, and an independent timestamp. Anyone can verify the package using the Verify Document Proof tool.
What is the Filecraft Completion Seal?
The completion seal is a tamper-evident integrity mechanism. It cryptographically protects your document so any modification is detectable. Verify sealed documents at any time using Filecraft Verify.
Why does Adobe Reader show a warning about the seal?
Adobe Reader may show the seal as "invalid" or "untrusted". This is expected. The Filecraft Completion Seal uses a self-issued certificate — not one from Adobe's Approved Trust List. This does not affect the seal's tamper protection. Use Filecraft Verify for authoritative verification.
What is the independent timestamp?
An RFC 3161 timestamp from a trusted third-party authority. It proves the document existed at a specific time, independent of device clocks. Only a 32-byte hash reaches the timestamp service — no document content.
Which plan is required?
Seal PDF requires a Pro or higher plan.
Is there a file size limit?
On the Free plan, files can be up to 10 MB. Pro and higher plans support up to 100 MB.