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Sign a PDF and keep a record that holds up PACT

Draw or type a signature and PACT appends a signature page to the PDF: name, role, time and the document's SHA-256, plus a certificate recording the hash of the signed file.

1. The document

Drop the PDF here, or choose it The document is hashed and read in browser memory. Sign a PDF that has already been signed with PACT to add a second signature page.

2. The signer

3. Sign

Check a signed file against its certificate

Choose a PDF signed with PACT and its certificate JSON; the file is hashed here and compared.

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How it works

PACT signs a PDF and keeps a record that holds up. Draw or type your signature and it adds a signature page with your name, role, the time and the document's SHA-256 fingerprint, plus a certificate you can use later to check the signed file has not changed. In most places a simple electronic signature can form a binding contract, though some kinds of document are excluded. The PDF is signed in your browser.

Doing this often? For signing with a certificate from a .p12 file, with a trusted timestamp, use PDF Studio. On its own, US$4 a month; with everything else, US$9 a month or US$79 a year. 7 days free.