Your files and signature never leave your device
JustPDF signs PDFs entirely in your browser. Your document and signature are never uploaded or stored anywhere.
Sign PDF Privately — No Upload, No Account Required
Add your signature to any PDF document without uploading your file or signature to any server. JustPDF handles the entire signing process in your browser, keeping your documents and personal signature completely private.
Why Sign PDFs Privately?
Your signature is one of the most sensitive pieces of personal information you have. When you use other online PDF signing tools, you typically upload both your document and your signature to their servers. This means a third party has a copy of your signature alongside the document it was applied to — creating a significant security risk.
JustPDF processes everything in your browser. Your PDF file is read locally, your signature is created and stored only in your browser session, and the signed PDF is generated on your device. Neither the document nor your signature ever touches an external server.
How to Sign a PDF Privately
- Upload your PDF document using the signing tool.
- Draw your signature with your mouse or finger, or type your name.
- Click on the page to place your signature where you want it.
- Resize and drag to fine-tune the position.
- Click "Sign & Download PDF" to get your signed document.
The entire process happens locally. Your signed PDF is downloaded directly to your device.
Other Signing Tools vs. JustPDF
Most electronic signature services upload your documents to cloud servers for processing. Some store copies of your signed documents on their platforms. Others require account creation, giving them access to your email and identity alongside your signature.
JustPDF requires no account, no email address, and no server interaction. The signing operation runs entirely in your browser using client-side JavaScript and the pdf-lib library. This makes it ideal for situations where document confidentiality is paramount.
Is This a Legal Electronic Signature?
Electronic signatures are legally recognized in most jurisdictions under laws like the U.S. ESIGN Act and the EU eIDAS regulation. JustPDF embeds your signature directly into the PDF file as an image, making it suitable for contracts, agreements, consent forms, and other documents that accept electronic signatures.
Privacy-Sensitive Use Cases
- Signing legal contracts and NDAs without exposing terms to third-party services
- Adding signatures to medical consent forms and patient documents
- Signing financial agreements, loan documents, and tax forms privately
- Executing employment agreements and HR documents confidentially
- Signing real estate contracts and property documents securely
- Adding signatures to government forms and official paperwork
Frequently Asked Questions
Is my signature stored anywhere?
No. Your signature exists only in your browser session. It is never transmitted to any server. When you close or refresh the page, the signature data is gone.
Does my PDF get uploaded?
No. Your PDF file is read locally by your browser. The file data never leaves your device. You can verify this by disconnecting from the internet after the page loads — the tool still works.
Can I sign on my phone or tablet?
Yes. The signature pad supports touch input, so you can draw your signature with your finger on mobile devices. This often produces a more natural-looking signature than using a mouse.
Does this work offline?
Yes. Once the page has loaded, the signing tool works without an internet connection. All processing is local to your browser.
More Private PDF Tools
All JustPDF tools process your files locally in your browser. No uploads, no servers, no data collection.