How to add your signature to a PDF online

Adding a signature to a PDF doesn't require Acrobat, doesn't require a printer, and doesn't require you to install anything. The entire process runs in your browser — typically in under two minutes from upload to download. Here's exactly how to do it, and what the different signing methods mean for the legal standing of the result.

Step-by-step: signing a PDF online

• Open InkRobin (or another browser-based e-sign tool) in your browser
• Click 'Upload document' and select your PDF
• The document opens in a signing view — scroll to find where the signature should go
• Click the signature field tool and drag it to that position
• Click the signature field to open the signing panel
• Choose your signing method: type, draw, or upload your signature
• Click Apply, then click Download or Send

Signing methods: which one should you use?

Type your name: the tool renders it in a handwritten-style font. Quick, clean, consistent. Draw: use your mouse, trackpad, or finger to write your signature. Looks more natural, especially on a touchscreen. Upload: photograph your ink signature and upload it as an image — the tool removes the background. All three are legally equivalent under ESIGN and UETA.

What happens to the document once you sign

The e-signature platform embeds your signature visually into the PDF and records the signing event: your email address, the time and date (UTC), your IP address, and a SHA-256 hash of the document. This data is compiled into a Certificate of Completion, which is attached to the signed PDF. If the document is ever disputed, the certificate is what proves who signed what and when.

Sending a PDF for someone else to sign

If you need a counterparty to sign — a client, a landlord, a collaborator — the workflow is the same up to the signing step. Instead of signing yourself, you click 'Send for signature', enter the recipient's email address, and InkRobin sends them a unique signing link. They receive an email, click the link, and sign in their browser with no account required. Both parties receive the signed PDF once all signatures are complete.

Is a PDF signed online legally binding?

Yes, provided the signature was applied with the intent to sign and the signing event was recorded. Under the ESIGN Act and UETA (in the US) and eIDAS (in the EU), electronic signatures carry the same legal weight as ink signatures for most document types. A signed PDF produced by a reputable e-signature platform — with an audit trail attached — satisfies the requirements of both pieces of legislation.

Frequently asked questions

• Can I sign a PDF online for free? Yes — InkRobin's free tier covers five documents per month with no credit card required.
• Can the recipient sign without creating an account? Yes — signers receive a unique link and sign directly in their browser. No account needed.
• How do I know the signed PDF hasn't been altered? The SHA-256 document hash in the audit trail proves the file is identical to what was signed at the time of signing.