PDF Signer & Annotator
Draw your signature, insert form text, apply date stamps, and place checkmarks directly on PDF contracts with 100% in-browser privacy.
Initialising PDF Studio...
Rendering document viewport in browser memory...
Handwritten Signature
Sign agreements, tenancy contracts, and permission slips using your finger, stylus, or mouse.
Fill Form Fields
Type names, email addresses, and notes directly onto any page with crisp, professional font rendering.
Dates & Checkmarks
Click to stamp today's date in UK format (DD/MM/YYYY) and tick required consent checkboxes instantly.
100% In-Browser
Your signature, identity, and confidential agreements never leave your device. All rendering is local.
⚡ How to Sign and Fill PDF Documents
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1
Upload Document
Drop your PDF into the upload zone or paste with Ctrl+V.
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2
Create Signature
Click ✍️ Sign, draw your signature smoothly, and click Use Signature.
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3
Place Annotations
Click the document canvas to position your signature, type text, or stamp today's date.
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4
Download Signed PDF
Click Download Signed PDF to embed everything permanently into your document.
💡 Practical Signing Tips
We embed signatures as high-resolution transparent vector layers. Your original document's text and formatting remain 100% crisp.
Placed an annotation in the wrong spot? Simply drag it across the canvas to adjust position before downloading.
The drawing canvas responds naturally to iPad, tablet, and smartphone touchscreens for a clean pen-on-paper feel.
Under the Hood: Canvas Coordinate Mapping & Vector PDF Embedding Show technical specifications ↓
High-Performance Vector Pipeline
The BWTools signature studio utilises PDF.js for high-precision viewport rendering and pdf-lib for low-level document tree mutation. When compiling your document, annotations are translated from CSS viewport coordinates to native PDF coordinate points (72 DPI points with an inverted Y-axis origin). Text elements are embedded directly using native Helvetica font streams, while signatures are encoded into lossless PNG image XObjects.
| Annotation Tool | Embedding Mechanism | Coordinate Mapping | Document Resolution | Privacy Guarantee |
|---|---|---|---|---|
| Handwritten Signature | PNG Image XObject | Proportional Point Transform | 100% Original Vector | 100% In-Browser |
| Form Text Field | Helvetica Font Stream | Dynamic Baseline Alignment | 100% Original Vector | 100% In-Browser |
| Date Stamp (DD/MM/YYYY) | Helvetica Font Stream | Standardised British Format | 100% Original Vector | 100% In-Browser |
| Checkmark (✓) | Vector Glyph / Accent RGB | Centered Check Box Mapping | 100% Original Vector | 100% In-Browser |
Frequently Asked Questions
Can I drag and reposition annotations after placing them?
Yes. Once placed on the document canvas, any signature, text input, checkmark, or date stamp can be dragged freely to fine-tune its position before final export. You can also remove individual annotations by clicking their red delete icon.
Does signing rasterise or reduce the quality of my PDF document?
No. The tool does not convert your document pages into flat image files. It embeds your annotations directly into the original PDF structure, preserving all original vector paths, typography, and searchable text layers.
Is my signature or document uploaded to any server?
Never. All signature drawing, canvas positioning, and binary PDF assembly execute 100% inside your local web browser. No files, signatures, or personal data ever leave your machine.