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Sign PDF

100% In-Browser Sandbox

Sign contracts, consent forms, and agreements. Draw with smooth touch/mouse ink, type an editorial script, or place an existing signature stamp.

Sign PDF

Sign contracts, consent forms, and agreements. Draw with smooth touch/mouse ink, type an editorial script, or place an existing signature stamp.

Notice: Visual electronic signature. Does not include cryptographic X.509 PKI certificate.

Signatures and documents never leave your local browser sandbox.

How to Use Sign PDF

  1. Step 1: Upload PDF document
  2. Step 2: Create your signature (Draw, Type, or Upload)
  3. Step 3: Position and scale on the target page
  4. Step 4: Burn signature and download

Technical Specifications & Limitations

  • Maximum file size: 50 MB.
  • Electronic signature stamp: Creates an electronic visual signature; does not apply cryptographic x509 PKI certificates.
  • Image formats: Supports PNG with alpha transparency for clean signature stamp uploads.

Troubleshooting Common Issues

⚠Signature image has a dark background.

Upload a transparent PNG signature file, or use the 'Draw' tab to ink your signature directly on screen.

⚠Signature appears too small on a high-res document.

Use the signature scale slider to enlarge the stamp before embedding.

🔒Privacy & Security Guarantee

All PDF processing for Sign PDF occurs 100% inside your local web browser sandbox using WebAssembly and client-side JavaScript. Your documents, images, and data are never transmitted over the internet or saved to external servers. Full confidentiality is preserved for sensitive scientific research, financial records, and legal contracts.

Frequently Asked Questions

Is this electronic signature legally binding?

In many jurisdictions under the ESIGN Act and eIDAS, electronic signatures are valid for agreements, leases, and contracts unless a qualified cryptographic certificate is explicitly mandated.

Does SciHive store my signature?

No. Your signature is drawn on an HTML5 canvas and burned into the PDF locally. We never store or transmit your signature.

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