Can I remove the white background from a photographed signature?

Yes! Our tool includes automatic white-background removal so when you take a photo of your signature on paper, only the clean ink strokes are stamped.

Can I choose which page to sign?

Yes, you can apply your signature to the current page, the last page, or all pages.

Sign PDF

100% Client-Side • Zero Upload

Sign PDF contracts and forms directly in your browser. Draw hand signature, upload stamp image, or type name with cursive font.

Upload PDF to Sign Online

Draw, upload image, or type signature. 100% in-browser, completely private.

PDFCtrl + Vto paste

How to Use Sign PDF

Upload PDF

Select or drag-and-drop the PDF document you want to sign.

Create Signature

Draw signature with mouse/pen, upload a signature image (with auto white background removal), or type your name.

Position & Apply

Click on the page preview to place the signature, adjust size, optionally add date stamp, and download the signed PDF.

Key Benefits

100% Client-Side: Sensitive contracts, NDAs, and business agreements never leave your device
3 Flexible input methods: Freehand draw with ink color presets, photo upload with auto transparent background, or typed cursive fonts
Interactive visual placement: Click or drag on page preview to place signature accurately
Automatic date stamp option to verify signature date (Signed: DD/MM/YYYY)

Browser & Hardware Notes

Encrypted or password-protected PDFs must be unlocked before signing
Provides visual document signing; does not generate cryptographic X.509 PKI certificates

Frequently Asked Questions about Sign PDF

No! All processing is performed 100% inside your browser memory using WebAssembly and pdf-lib. Your confidential documents and signatures never leave your computer.

100% In-Browser Privacy Architecture

How Sign PDF Operates Privately on Your Device

Unlike traditional cloud services that transmit your confidential files across the open internet to remote servers, SafeWebUtil operates on a strict zero-upload client-side architecture. Every transformation performed by Sign PDF executes exclusively within your browser's secure memory sandbox.

Lossless CosObject Tree Parsing

Parses and modifies low-level Cross-Reference (XRef) tables and CosObject streams via WebAssembly. Vector paths, Bézier curves, and TrueType fonts remain 100% crisp without destructive rasterization.

Isolated Browser Heap Memory

File bytes are read into transient ArrayBuffer allocations in local RAM. Background Web Workers manage garbage collection efficiently, supporting documents over 100MB with zero server exposure.

Strict Zero-Telemetry Privacy

Meets stringent compliance mandates (GDPR Article 32, HIPAA technical safeguards, corporate NDAs). Contracts, legal filings, and financial records never leave your machine.

Engineering Insights & Performance Best Practices for Sign PDF

Our PDF engine manipulates CosObject streams without canvas rasterization. Vector fonts, Bézier curves, and metadata remain intact. For large files over 100MB, close background browser tabs to maximize available RAM.

Read our technical research on why client-side processing is the future of digital privacy

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