Sign PDF
Add your signature to PDF documents easily.
What is Sign PDF Document?
Draw your signature on a canvas and stamp it onto a PDF. Free, private, and processed entirely in your browser with no upload and no account.
When should you use it?
This tool is useful when you need to encrypt, unlock, sign, compare, or cover sensitive areas of a PDF.
How Sign PDF Document handles your file
Your signature is drawn on a canvas in your browser and placed onto the PDF with pdf-lib. Nothing is uploaded.
Your device's own CPU does the work, so there is no upload wait and no server-side copy of your document to retain.
Good to know before you convert
- The signature is placed at a fixed position — bottom-right of the first page — at a fixed size. You cannot drag, resize, or reposition it.
- Only page one is signed, and only one signature is applied per file.
- The signature must be drawn; there is no typed-signature font and no image upload option.
- This is a visual electronic signature. It is not a cryptographic digital signature and carries no certificate, timestamp, or tamper-evidence.
How to use Sign PDF Document
Upload the document you need to sign.
Draw your signature on the canvas using a mouse, trackpad, or touch screen.
Click to apply it — the signature is stamped in the bottom-right corner of the first page — and download the signed PDF.
Why choose PdfPix for Sign PDF Document?
Private by design
The file is never uploaded. Everything happens inside your browser tab, so there is no remote copy of your document to leak, retain, or subpoena.
No File Size Limits
Because conversions run locally using your computer's CPU power, we don't impose any artificial file size caps, queue delays, or wait times.
100% Free Forever
Get full access to all features without subscriptions, credit card inputs, or registration walls. No branding watermarks added to your outputs.
Universal Compatibility
PdfPix runs smoothly inside any modern browser on macOS, Windows, Linux, iOS, or Android, without needing external applications or plugins.
How PdfPixCompares to iLovePDF & Smallpdf
Unlike traditional cloud PDF services that upload your confidential documents to remote servers, PdfPix processes your files 100% in your browser. No file size paywalls, no task queues, and zero remote data retention.
Frequently Asked Questions
Are signatures created on PdfPix legally binding?
PdfPix applies a visual electronic signature. In many jurisdictions simple agreements, NDAs, and invoices can be signed electronically, but validity depends on your local law and the nature of the document. This is not a cryptographic digital signature: it carries no certificate, no timestamp, and no tamper-evidence, so for high-value or regulated transactions you should use a qualified e-signature provider.
Can I place the signature anywhere on the page?
No. The signature is drawn at a fixed position in the bottom-right corner of the first page. For free positioning, use the Edit PDF tool to place a signature image exactly where you want it.
Can I type my signature instead of drawing it?
Not in this tool — signatures must be drawn on the canvas. If you would rather use a typed or scanned signature, create the image elsewhere and place it with the Edit PDF tool.
Can I sign more than one page?
Not with this tool. Only the first page receives the signature. To sign several pages, use Edit PDF, which lets you place a signature image on any page.
Is my signature image safe?
Yes. Your signature is drawn and placed entirely in your browser. It is never stored or uploaded to a server.
Related PDF tools
Unlock PDF
Remove PDF password protection to unlock your PDF files.
Protect PDF
Add password protection to your PDF files.
Redact PDF
Permanently remove sensitive text and areas by flattening pages with the content destroyed.
Compare PDF
Compare two PDFs for structural differences in page count, dimensions, and rotation.
Related guides from the PdfPix blog
Step-by-step articles that show how to get the most out of Sign PDF Document in real workflows.
How to Choose Secure Online PDF Tools Without Slowing Down Your Team
A practical security review of online PDF utilities: how to verify client-side processing yourself, what real encryption standards look like, why masking is not redaction, how AI features change the privacy model, and the questions to ask before a compliance sign-off.
Read guide →How to Sign a PDF Online Free: Electronic vs Digital Signatures Explained
A clear guide to signing PDFs in a browser: the legal frameworks that make e-signatures binding, the important difference between a simple electronic signature and a certificate-backed digital signature, and how to know which one a document actually requires.
Read guide →How to Edit a PDF in Your Browser: What You Can Change and What You Cannot
A practical guide to browser-based PDF editing: how canvas rendering and annotation overlays work, the whiteout-and-retype technique for changing text, and the cases where editing the PDF is the wrong approach entirely.
Read guide →