DocScalar works best with JavaScript enabled for interactive canvas workflows. All document utilities, purpose documentation, and privacy policies are accessible below.
DocScalar Logo DocScalar Sign PDF

DocScalar: Sign PDF Online Free, Add Digital Signature

Sign PDF documents electronically with drawn, typed, or uploaded signatures. Create verified, legally binding documents in seconds.

How to Use DocScalar Sign PDF

  1. Open Document to Sign: Upload your contract, agreement, or form into the secure online document signing canvas over encrypted TLS 1.3 into isolated memory without writing files to persistent server disks.
  2. Create Your Signature: Draw your signature using mouse or touch, type a stylized name, or upload an existing signature PNG with transparency into your active session with full anti aliased smoothing.
  3. Place & Export: Position and scale your signature, initials, date fields, and text callouts on the target document pages with precise visual bounding boxes and opacity adjustments.
  4. Signature Placement Verification & Download: Inspect vector signature alignment across pages and export your signed PDF with verified cryptographic integrity and full legal compliance ready for countersigning.

Technical Specifications & Limits

Output Format
Signed PDF (ISO 32000-1 / PAdES Compatible)
Max File Size
10 MB (Guest) / 15 MB (Free) / 1 GB (Pro)
Security Standard
TLS 1.3 / In Memory Isolation
Quality Retention
Lossless Vector Signature Overlay
Processing Architecture
Ephemeral RAM Execution (Zero Disk Persistence)
Supported Platforms
Universal Web (Windows, macOS, Linux, iOS, Android)
Compliance Standards
ISO 32000-1 (PDF Standard) / ISO 19005 (PDF/A) / GDPR & HIPAA Compliant
Engine Architecture
DocScalar High Throughput Memory Core
Network Security
TLS 1.3 Strict Transport Security
Memory Retention
0 Seconds (Immediate Post Download RAM Shredding)

Frequently Asked Questions

Is signing a PDF in DocScalar legally recognized?

Yes. DocScalar electronic signatures comply with the US ESIGN Act, UETA, and European eIDAS regulations for binding business agreements, commercial leases, and employment contracts with audit verification and tamper resistance.

How does DocScalar safeguard my signature graphics and document confidentiality?

Your signature assets and documents are processed strictly in your active session memory via TLS 1.3 and wiped instantly upon export with zero server disk logging, permanent caching, or telemetry storage.

What is the file size limit for signing documents?

DocScalar supports files up to 10 MB in instant guest mode with zero registration required, 15 MB for registered free accounts, and up to 1 GB for Pro tier users. All processing executes in isolated memory buffers with zero data retention.

Can I save multiple signature profiles for reuse?

DocScalar allows you to maintain multiple signature styles, stamps, and initials within your active browser session for quick application across multipage agreements without redrawing each time.