How to Electronically Sign a PDF for Free — No Software, No Uploads

You need to sign a PDF. Maybe it's a contract, a permission slip, a job offer. Someone emailed it to you, and they need it back signed — today. Your first thought: DocuSign. Your second thought: $10/month for something I do three times a year? No thanks.

Electronic Signature vs. Digital Signature

Electronic signatures are the digital equivalent of your handwritten signature — you type, draw, or upload it, then place it on the document. This is what 95% of people need. Digital signatures are cryptographic, using certificates to mathematically prove authenticity. You need those for tax filings and regulated industries — not for a freelance contract.

Why DocuSign and Adobe Sign Are Overkill

DocuSign is excellent — multi-party workflows, audit trails, compliance features. But for signing one document? It's like renting a semi-truck to move a shoebox. What you pay $10–40/month for: sequential signing, certificate-based signatures, audit trails, API access. What you actually need: open PDF, add signature, save. That's it. And it's free.

How to Sign a PDF in Your Browser

1. Go to PDF Toolbox
2. Open your PDF — it stays in your browser
3. Create your signature: type, draw with mouse/trackpad, or upload an image
4. Place and resize the signature on the page
5. Download your signed document

Desktop Alternatives

Preview on Mac (free): Tools → Annotate → Signature. Sign with trackpad or hold up signed paper to camera. Best free desktop e-sign tool. Adobe Acrobat Reader (free): Tools → Fill & Sign. Microsoft Edge: Open PDF → pen icon → Add Signature.

Is a Browser-Based E-Signature Legally Binding?

Yes — in most cases. The ESIGN Act (US) and eIDAS (EU) establish that electronic signatures carry the same legal weight as handwritten ones, as long as all parties consent and the signature is attributable. For everyday contracts and agreements, a browser-based signature is sufficient.