PDF Signing — Electronic Signatures That Are Fast, Verifiable, and Legally Defensible

E-signatures are legal — but the strength varies

Electronic signatures are legal in most countries under laws like the U.S. ESIGN Act, the EU eIDAS regulation, India's IT Act, and the UAE's Electronic Transactions Law. What varies is the level of proof required for the signature to hold up in a dispute.

PDFTrusted's signing workspace supports three signature types so you can match the tool to the situation instead of over-engineering (or under-engineering) every signed file.

Signature types you can use

Pick the type that matches the document risk and the counterparty's expectations.

• Typed signature — choose a signature-style font and type your name. Fast, casual, suitable for internal approvals and low-risk agreements.
• Drawn signature — sign with a mouse, stylus, or finger on a touchscreen. Visually matches a paper signature and is widely accepted for most business contracts.
• Certificate-based digital signature — attach a cryptographic signature using a .p12 or .pfx file issued by a trusted Certificate Authority. This is the strongest option — the signed PDF carries a tamper-evident seal that any PDF reader can verify.

Placing your signature on the page

Drag the signature block onto the exact position on the page it should appear. You can add multiple signature fields, initials, dates, and optional company stamps. Every placement is previewed at the exact size and location it will appear in the final file, so there are no surprises after downloading.

What makes a signature verifiable

Four elements move a signature from decorative to defensible.

• Signer identity — a name and email captured at signing, ideally paired with a link click confirmation.
• Intent — a clear 'I agree to sign' acknowledgement before the signature is applied.
• Integrity — a cryptographic hash of the document that changes if a single byte is later modified.
• Audit trail — timestamp, IP address, and event log kept alongside the signed file.

When to use a certificate-based signature

Certificate-based signatures are recommended for tender documents, cross-border contracts, tax filings, board resolutions, and anything you might need to defend in court. The certificate binds your identity to the file at the cryptographic level.

Even opening the file in a different PDF reader will show a green verification indicator, or a red warning if the file was altered after signing. If you do not have a certificate, providers like DigiCert, GlobalSign, eMudhra, and Sectigo issue individual and organizational certificates.

Preparing a document for signing

A few pre-flight steps prevent the most common signature mistakes.

• Flatten form fields you do not want the signer to edit.
• Add your logo or company header before uploading — signed files should not be altered afterwards.
• Merge multi-page attachments into a single file so the signature covers the entire agreement.
• Confirm the file is not password protected; unlock it first if needed.

Privacy and data retention for signed files

Signed files and their audit trails are stored encrypted for the duration of your session, then deleted within one hour unless you have an active plan that includes signed document history. We never share signed documents with any third party.