Three Ways to Sign a PDF Free
| Method | Time | Best For | Legally Binding? |
|---|---|---|---|
| Browser tool (Sign PDF) | 30 sec | Quick signatures, no install | ✅ ESIGN Act compliant |
| Preview (Mac) | 1 min | Mac users, built-in | ✅ Yes |
| DocuSign free tier | 3 min | Multi-party, audit trail | ✅ Most legally robust |
Method 1: Browser Tool (Easiest)
- Go to Sign PDF
- Upload your PDF (drag-and-drop works)
- Click where you want your signature to appear
- Choose: Draw (mouse/touch), Type (handwriting font), or Upload (photo of your real signature)
- Click "Apply Signature" then download the signed PDF
Your PDF never leaves your browser. The signature is embedded directly using pdf-lib. The tool works offline once loaded — turn off your internet and it still works. No document is ever uploaded to a server.
Method 2: Preview (Mac)
- Open PDF in Preview (double-click or right-click → Open With → Preview)
- Click Markup toolbar button (pen tip icon) or press Cmd+Shift+A
- Click Signature button (cursive S icon) → Create Signature
- Sign on trackpad, or hold paper with your signature up to camera
- Place, resize, drag to position. Cmd+S to save
Method 3: DocuSign (Multi-Party or Legal)
Free tier: 3 signature requests/month. Use when you need multiple signers in sequence, an audit trail, or tamper-evident seals. Overkill for most single-signer documents — embedded signatures via methods 1 or 2 are legally valid under the ESIGN Act (US) and eIDAS (EU).
Are Electronic Signatures Legally Binding?
Yes. ESIGN Act (2000) and UETA give e-signatures the same weight as ink, provided: all parties consent, the signature is attributable to the signer, and the document can't be altered after signing without detection. Exceptions: wills, trusts, adoption papers, some family law documents still require wet ink in most states.
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