Sign PDF
Add your signature to PDF documents for contracts, agreements, forms, and authorizations. Create signatures three ways: draw with your mouse or touchpad, type your name in a professional script font, or upload an existing signature image. Position anywhere on any page with drag-to-place precision.
What does this tool do?
The Sign tool embeds visual signatures into PDF documents. It offers three signature creation methods: freehand drawing for personal handwritten signatures, typed signatures in elegant script fonts for clean professional appearance, and image upload for existing scanned signature files. Position your signature by clicking anywhere on the page preview, then resize by dragging the corner handles. Signatures are flattened into the page content, making them a permanent part of the document.
How it works
Using an interactive canvas interface, the tool renders the PDF page for signature placement. For drawn signatures, it captures stroke data as vector paths. For typed signatures, it renders text using embedded script fonts. For uploaded images, it embeds the image resource. When placed on the page, the signature is transformed to the specified position and scale. Upon saving, MuPDF bakes the signature into the page's content stream as permanent graphics, creating a standard PDF with embedded signature visible in any viewer.
Features
- Three signature sources: draw, type, upload
- Visual placement: click anywhere on page preview
- Resize by dragging corner handles
- Three elegant script font styles for typed signatures
- Place on any page in multi-page documents
- Signature flattened into page content
- Works with stylus, mouse, or touch input
How to use
- 1
Upload the document to sign
Drag the PDF that needs your signature onto the drop zone. The tool loads the document and displays the first page in the signing interface.
- 2
Create your signature
Choose your method: Draw — use mouse/touchpad/stylus to sign naturally; Type — enter your name and pick from three script fonts; Upload — select a PNG/JPEG of your existing signature.
- 3
Position the signature
Click on the page preview where you want the signature placed. Drag the corner handles to resize larger or smaller. The signature maintains aspect ratio while resizing.
- 4
Navigate to other pages if needed
Use page navigation if you need to sign multiple pages or place different signatures throughout the document.
- 5
Save the signed document
Click Save Signed PDF. The document downloads with your signature permanently embedded in the page content.
Common use cases
Sign contracts and agreements
Add your signature to employment contracts, service agreements, rental contracts, and business deals for legally binding execution.
Authorize forms and applications
Sign permission slips, authorization forms, loan applications, and permit applications requiring signature verification.
Approve documents and invoices
Managers and executives can sign approval on purchase orders, invoices, expense reports, and internal approvals.
Notarize and certify
Add signature blocks for notarization, witnessing, or certifying document authenticity in legal and official contexts.
Tips & best practices
- Drawing with a stylus on touchscreen devices produces the most natural handwritten signatures
- For formal business documents, typed signatures in script fonts appear more professional than quick mouse drawings
- Sign large and resize down rather than drawing small — this gives smoother stroke details
- Position signatures slightly below text lines to align naturally with handwritten conventions