Edit PDF
Add text, images, drawings, and shapes to your PDF. Full visual editor with drag-and-drop.
Sign PDF
Add your signature to any PDF. Draw, type, or upload your signature and place it anywhere. Free, no signup, up to 200MB.
3 free operations remaining today
Drop your PDF to sign
or click to browse your files (Max 200 MB)
Browse files
How to Sign a PDF
Smart PDF Lab adds your signature to PDFs in four steps without any software installation.
- 1
Upload your PDF.
Drop your PDF or click Browse files to upload the document you want to sign.
- 2
Create your signature.
Draw your signature, type it, or upload an image of your signature.
- 3
Place the signature.
Position your signature anywhere on the PDF and resize as needed.
- 4
Download the result.
Save your signed PDF directly to your device.
Why Sign PDFs With Smart PDF Lab
Smart PDF Lab makes signing contracts, agreements, and forms simple without expensive e-signature platforms. Add a typed signature for casual documents, draw your signature with mouse or touchscreen for personal contracts, or upload an existing signature image for business use.
Smart PDF Lab supports unlimited signatures per document, multiple signature placements, and PDFs up to 200MB. There is no signup, no daily limit, and no watermark on the output.
Three Signature Types You Can Use
- Drawn — Captured via mouse or touchscreen. Ideal for personal contracts, letters, and documents where a handwritten look matters.
- Typed — Generated in a clean, readable font. Best for casual approvals and standard form fields.
- Uploaded — Uses a saved image of your signature. Suited for business contracts where consistency across documents is required.
All three types place your signature directly on the PDF without modifying surrounding content.
Frequently Asked Questions
Are signed PDFs legally binding?
Smart PDF Lab signatures are visible signatures suitable for most personal and business agreements. For documents requiring qualified electronic signatures, consult your jurisdiction’s specific requirements.
Can I add multiple signatures to one PDF?
Yes. Add as many signatures as your document needs. Each signature can be drawn, typed, or uploaded independently.
Are my signed documents private?
Yes. PDFs upload through HTTPS-encrypted connections, process on our servers, and auto-delete the moment your signing completes.