Sign PDF Online | NivoPDF
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Sign a PDF online
Add a signature to your PDF directly in your browser. Upload the file, place the signature, and download the signed document.
This tool is useful for contracts, invoices, forms, and any document that needs a quick signature without printing.
After signing, you can protect the PDF with a password, flatten it for consistent rendering, or add a watermark.
FAQ
Is my PDF stored permanently?
Files are processed to generate the result and then made available for download. For privacy details, check the Privacy Policy page.
Can I sign on mobile?
Yes. Upload your PDF, place the signature in the editor, and download the signed file.
Will the signature be visible in all PDF viewers?
In most cases yes. If you need maximum compatibility, use Flatten after signing.
Can I sign multiple pages?
Yes, you can place signatures on different pages from the editor.
Does signing change the quality of the PDF?
No. The document content remains the same—only the signature layer is added.
What should I do after signing?
Common next steps are Protect (password), Flatten (compatibility), or Watermark (branding).