Sign a PDF with a verified digital certificate

Every document PDF Verified seals is protected by a SHA-256 cryptographic hash and an RFC 3161 trusted timestamp from an independent authority, a digital certificate of integrity. Recipients can verify the signature and confirm the file hasn't been altered, by code, QR or upload.

Sign PDF online → · Free PDF Signer

What you can do

Sign a PDF with a verified digital certificate

  1. Open the free signer and drag your PDF in, or tap to choose a file, no account needed.
  2. Draw, type or upload your signature, then drop it exactly where it belongs. Add the date, initials or text fields too.
  3. Click seal, PDF Verified binds the signature to the document with a tamper-evident cryptographic hash and an audit trail.
  4. Download the signed PDF or share a verification link. Anyone can confirm it is genuine and unaltered.

Ready? Sign PDF online now, free, no signup, and your file is auto-deleted after an hour.

Frequently asked questions

What is a digital certificate on a signed PDF?

It is cryptographic proof of integrity: a hash of the exact bytes of the document, sealed at signing time and stamped by an independent timestamp authority. If a single character changes afterwards, verification fails, so recipients know the file is exactly what was signed.

Is it free to sign a PDF online?

Yes. You can fill in and sign a PDF for free with no account, you only pay when you download a finished document ($1.50 per document pay-as-you-go, or unlimited on any paid plan). sign a PDF with a digital certificate works the same way.

Is signing a PDF online secure?

Yes. Files are uploaded over 256-bit TLS, processed in your browser session, and automatically deleted after one hour. Each signature is bound to the document with a SHA-256 tamper-evident seal, so any later edit is detectable.

Are electronic signatures legally binding?

Yes, electronic signatures are legally binding for ordinary business documents in 190+ countries under the US ESIGN Act and UETA, the EU eIDAS Regulation, and equivalent laws worldwide. Courts look for intent, identity and integrity, all of which PDF Verified records.

Do I need to install anything?

No. Everything runs in your browser on desktop or mobile, no app, plugin or download required.

What PDF Verified is, and what it is not

Electronic signature law is settled in broad terms and specific in the details. The ESIGN Act, UETA, eIDAS and their equivalents recognise electronic signatures across more than 190 countries, and what decides a particular case is intent to sign plus evidence connecting the signature to the signer, which is what the audit certificate records. Certain document types carry their own formalities wherever you are: deeds, wills, some property instruments, and anything requiring a witness or a notary. Sign only what you are authorised to sign, since applying another person signature without their authority is forgery whatever tool is used.

PDF Verified is a tool for preparing, signing, stamping and checking documents. It is not a law firm, a compliance service or a forensic examiner, and nothing here is legal, financial or compliance advice. Requirements differ by country, by document type and by the party asking, so check what applies to your document before you rely on it, and take advice where the document matters. You are responsible for the documents you create, sign and send, and for having the authority to do so: signing or stamping in somebody else name, or as an organisation you do not represent, is forgery whatever tool is used. To the extent the law allows, we accept no liability for how a document made with this tool is used or relied on. The full position is in our terms of service.

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