Sign PDF Online
Add a signature to your PDF document online. Draw, type, or upload your signature and place it on the required PDF page.
Max 50MB • Accepted: .pdf
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Draw Your Signature
How ScanPDF Applies Electronic Signatures to PDF Pages
ScanPDF processes electronic document signing using a visual coordinate mapping engine. When you draw a handwritten signature on the interactive canvas or upload a scanned signature image, the client-side editor tracks the exact normalized coordinates, page indices, and scale factors relative to each PDF viewport.
Upon confirmation, the backend engine embeds your signature asset into the target PDF document as an alpha-blended vector or high-resolution raster overlay directly at the specified coordinate bounding box. The resulting page streams are flattened to prevent shifting across different PDF viewers, mobile devices, and desktop operating systems.
Signature Stamping Pipeline
Vector / Raster Capture
Smooth canvas ink path or PNG asset
Viewport Coordinate Mapping
Normalized X, Y, width, and height
Direct Page Stream Overlay
Permanent visual burn-in & save
Legal & Technical Distinction
Electronic Visual Signature (This Tool)
A graphic representation of your signature or stamp placed onto document pages. Ideal for commercial invoices, release authorizations, standard agreements, internal requisitions, and operational paperwork.
Digital Certificate (X.509 PKI)
A cryptographic hash signed by a third-party Certificate Authority (CA) embedding identity keys. Required for court depositions, government tenders, and strict statutory filings.
Understanding Visual Signing vs Cryptographic Sealing
Most routine corporate paperwork, project approvals, freelance contracts, and vendor acknowledgments require an electronic visual signature (e-signature) to confirm agreement and intent. ScanPDF provides a streamlined visual stamping workflow that embeds your signature directly into the document layout.
Because this tool operates without third-party certificate infrastructure, the final PDF does not include cryptographic PKI seals or hardware token validation. This ensures instant turnaround, complete browser-based convenience, and compatibility with every standard PDF reader without requiring subscription accounts or proprietary signer apps.
Flexible Signature Creation & Placement
Create your mark exactly how you prefer and position it seamlessly across any page of your document.
Draw on Canvas
Use your mouse, trackpad, or touchscreen stylus to produce a smooth, handwritten signature with real-time vector smoothing.
Upload Image Stamp
Upload an existing PNG or JPG photo of your signature or company stamp. Transparent alpha channels are preserved automatically.
Precision Drag & Scale
Drag signatures to the signature line with sub-pixel precision and resize proportionally using intuitive corner handles.
Multi-Page Placement
Navigate through all document pages and stamp signatures or initials wherever endorsements or acknowledgments are required.
How to Sign a PDF Document
Complete your document signing process in four straightforward steps directly in your browser.
Upload Your Document
Select or drag your PDF file into the upload zone. ScanPDF loads page previews instantly.
Create Your Signature
Draw your signature with smooth stroke smoothing or upload an existing signature image from your device.
Position & Scale on Page
Drag the signature badge onto the designated signature line. Adjust dimensions to fit the space cleanly.
Apply & Download
Click Sign PDF to burn the signatures into the document stream, then download your finalized file immediately.
commercial_contract.pdf
Page 4 of 4 • 1 Signature Placed
Everyday Use Cases for PDF Signing
Designed for business owners, independent professionals, and administrative teams.
Service Proposals
Sign freelance quotes, statements of work, and project deliverables with zero printing.
Lease Agreements
Endorse tenancy renewals, rental applications, and inventory condition receipts promptly.
Vendor Invoices
Stamp accounts payable approvals, supplier purchase confirmations, and delivery orders.
Internal Requisitions
Authorize departmental expense reports, leave requests, and equipment sign-outs easily.
Why Sign Documents With ScanPDF
A clean, reliable web tool built for quick turnaround without burdensome sign-in walls.
Interactive Visual Placement
See exactly where your signature sits on the page before finalizing. Scale, reposition, or delete elements with intuitive visual feedback.
No Forced Account or Cloud Retention
Sign documents without being forced to create an account, enter payment cards, or leave your contracts permanently archived in a cloud vault.
Touchscreen & Stylus Ready
Draw your signature naturally on mobile phones, tablets, or trackpads with high-fidelity stroke capture and smooth curve rendering.
Universal PDF Reader Compatibility
Exported files comply with standard ISO PDF specifications and render accurately in Adobe Acrobat, Apple Preview, Chrome, and Edge.
Signing Guidelines for Clean Results
- High contrast ink: When drawing on screen, use solid dark ink (black or dark navy) to ensure high visibility across white background documents.
- Transparent PNG scans: If uploading a photograph or scan of a paper signature, save it as a transparent PNG to avoid white rectangular boxes overlapping page text.
- Check multi-page placement: If your document requires initials on each page and a full signature on the final execution page, place all elements before clicking save.
- Legal requirement check: For transactions requiring qualified digital certificates (eIDAS or statutory real estate deeds), verify with legal counsel whether electronic visual stamps are permitted.