Sign PDF Online Free – Add Electronic Signature

High-Fidelity PDF Engine

Sign PDF Documents Online

Add electronic signatures, date stamps, and custom initials to contracts, agreements, and NDAs. 100% private in-browser document signing.

100% Private & Secure

Instant Processing

Zero Quality Loss

Free Forever

Sign Contracts, Lease Agreements, and NDAs Without Printing or Scanning

The outdated routine of printing out contracts, signing with a physical pen, scanning the paper back to your computer, and emailing a messy low-resolution scan is slow, wasteful, and frustrating. In today's digital workflow, electronic signatures streamline approvals and execute agreements in seconds.

Our Sign PDF tool lets you apply clean electronic signatures directly to your PDF contracts. Draw your signature using a mouse, trackpad, or tablet stylus, type your name using legal signature scripts, or upload a pre-existing signature stamp image. Place signatures, date stamps, and initials on any page with pixel precision.

Popular Everyday Use Cases

Vendor Agreements & Freelance Contracts

Sign statements of work, vendor terms, and consulting agreements instantly to kick off projects without administrative delays.

Employment Offers & HR Onboarding

Execute job offer letters, direct deposit authorizations, and employee handbook acknowledgments electronically.

Real Estate Leases & Rental Applications

Sign tenancy agreements, lease renewals, and security deposit acknowledgments directly from your smartphone or tablet.

Non-Disclosure Agreements (NDAs)

Exchange mutual NDAs and intellectual property protection waivers securely and privately before confidential business discussions.

How to Sign a PDF in 3 Easy Steps

Execute and sign your PDF documents with total legal peace of mind.

Upload Your Document

Drag and drop your PDF agreement or contract into the signing canvas.

Create & Position Your Signature

Draw your signature, type styled legal script, or upload a signature stamp, then place it anywhere on the page.

Download Your Signed PDF

Click Sign Document to permanently bake your signature and date stamps into the document.

Electronic Signatures vs. Wet Ink: Practical Legal Compliance

Modern business transactions around the globe rely on electronic signatures governed by standards such as the US ESIGN Act, UETA, and EU eIDAS regulations. Electronic signatures indicate clear intent to sign and create a tamper-evident audit record.

Our signing engine integrates your signature vectors directly into the native PDF stream, locking the document against accidental cosmetic distortion while keeping the underlying text fully searchable and legible.

Tip: Use our freehand drawing mode on mobile or tablet touchscreens for an authentic handwritten signature look.

Tip: Add supplementary fields such as date stamps, printed name text blocks, and company title tags.

Zero-Knowledge Confidentiality for Sensitive Agreements

Contracts often outline proprietary commercial terms, non-public revenue commitments, or sensitive personal data. Uploading unredacted agreements to remote signing clouds poses a major compliance risk.

JustPDFConverter executes the entire document signing pipeline locally in your browser. Your contract and signature never leave your device.

PDF Signing Features & Specifications

Signing ModesDraw (Freehand), Type (Signature Fonts), Upload (Stamp Image)

Supported Additional FieldsDate, Initials, Printed Name, Checkbox, Text Notes

Output ComplianceISO 32000-1 Standard PDF with embedded vector signatures

Privacy Architecture100% In-Browser Execution (Zero remote server storage)

Cross-Device SupportDesktop, Mac, iPad, iPhone, Android, Surface Pro

Frequently Asked Questions

Everything you need to know about processing files with JustPDFConverter

Can I sign a PDF using my mouse or a touchscreen stylus?

Yes! The drawing canvas responds smoothly to mouse cursors, laptop trackpads, fingers, and stylus pens like the Apple Pencil.

Are electronic signatures created here legally valid?

Yes. Electronic signatures on commercial agreements and general contracts are widely recognized and enforceable under the US ESIGN Act, UETA, and international e-signature frameworks.

Can I type my name instead of drawing it?

Yes, you can choose from elegant signature fonts to type your name, or upload an image file of your physical signature.

Is my confidential contract uploaded to any server?

No. The document signing process is executed 100% inside your web browser. Your confidential contracts and signature data are never stored or seen by third parties.

Can I add date stamps, company titles, and initials?

Yes! You can place multiple signature fields, date stamps, and customizable text blocks across multiple pages of the same document.

Specialized Presets & Formats