Sign PDF
Add your PDF, PNG, or JPG file, choose any options you need, and DOC321 prepares the PDF result for you.
Sign PDF
Choose a PDF and create a new updated copy in your browser without changing the original.
Choose a PDF file to begin.
Add a visible PNG or JPG signature image to a selected PDF page and download a new signed copy in your browser.
Free Sign PDF
Works with PDF, PNG, or JPG
Get a usable PDF result
Free Online Sign PDF: Add a visible signature to a PDF
Add a visible PNG or JPG signature image to a selected PDF page and download a new signed copy in your browser. It is also useful for converting add signature to PDF when you want the same task handled in one straightforward browser workflow.
Place a signature image
Choose a PNG or JPG signature image, select a PDF page and position, then create a new signed copy.
Page-aware placement
Signature placement uses the selected PDF page dimensions so corner and center positions stay inside the page.
Original stays unchanged
The tool creates a new PDF and does not modify the source file you selected.
How to Use Sign PDF
- 1Add PDF, PNG, JPG
Choose the file or content you want to work with in the hero workspace, or drag it into the upload area.
- 2Choose your options
Set only what is necessary for the result you want.
- 3Run Sign PDF
Add a visible signature to a PDF
- 4Use PDF
Review the result, download it, or continue into a closely related workflow.
Sign PDF for Everyday Workflows
Purpose-built action
Sign PDF is designed around the specific task people come to the page to finish.
Focused workflow
Everything on the page is organized around one job: add a visible signature to a PDF.
Clear source and result
Know what goes in as PDF and what you should expect back as PDF.
Built for everyday files
Use the tool for school, office, personal, client, publishing, and administrative document tasks.
Easy to review
Check the result before you download, share, submit, print, publish, or continue into another tool.
Easy next step
Related DOC321 tools stay close by when the finished file needs another conversion, edit, or document action.
FAQs About Sign PDF
How do I add a signature to a PDF?
Choose a PDF, upload a PNG or JPG signature image, select the page and position, then create the signed PDF.
Does this create a cryptographic digital signature?
No. This tool places a visible signature image on the PDF. It does not create a certificate-based digital signature.
Can I choose where the signature appears?
Yes. Choose the target page, common page positions, and the signature width before creating the output.
What does Sign PDF do?
Sign PDF is designed to add a visible signature to a PDF. The page keeps that task, the supported PDF input, and the PDF result together in one browser workflow.
Can I use Sign PDF online for free?
Yes. DOC321 provides Sign PDF as a free online browser tool so you can start the supported workflow from the page without installing a separate desktop application.
Document Work Made Easier
Finished with Sign PDF? DOC321 keeps related PDF, Word, image, spreadsheet, presentation, text, and document tools close so you can continue the workflow without starting over.
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