Sign a PDF Online

ONLINE PDF SIGNING TOOL

Sign a PDF online with precise control

SuperTool gives you a focused workspace for adding visible signatures and initials to a PDF. Draw a signature, type your name in a signature style, or upload a PNG, JPG, or WebP image. Then place each mark exactly where it belongs before downloading the finished PDF.

Unlike a basic “stamp an image” tool, Sign a PDF is built for careful placement. Drag, resize from any corner, rotate, adjust opacity, duplicate, copy and paste, or repeat the same mark across selected pages. Page thumbnails make longer documents easier to navigate, while fit-to-page and zoom controls help you check the details.

How to sign a PDF online

  1. Upload a PDF up to 100 MB.
  2. Create a signature or initials by drawing, typing, or uploading an image.
  3. Place the mark on any page, then resize, rotate, or adjust its opacity.
  4. Duplicate it or repeat it on a page list, a range, or every page.
  5. Review the document and download the signed PDF.

Made for accurate placement

  • Draw, type, or upload signatures and initials.
  • Drag, resize, rotate, and control opacity.
  • Repeat a placement on pages such as 2, 4–7, or all.
  • Undo, redo, duplicate, delete, copy, and paste.
  • Use arrow keys for one-pixel movement, Shift for 10 pixels, or Alt for quarter-pixel nudges.
  • Preserve the original PDF pages while flattening visible marks into the download.

Frequently asked questions

Can I type my signature instead of drawing it?

Yes. Choose Type, enter your name or initials, select a signature style and ink color, then place the result on the PDF.

Can I upload a photo or scan of my signature?

Yes. Upload a PNG, JPG, or WebP image. The optional white-background removal control can help turn a scan or photo into a cleaner transparent mark.

Can I add a signature to more than one page?

Yes. Place the signature once, choose Repeat, and enter individual pages, a range such as 4–7, or all.

Does this create a certificate-based digital signature?

No. SuperTool adds a visible signature or initials to the PDF. It does not issue a cryptographic certificate, verify a signer’s identity, or replace a regulated e-signature workflow. Whether a visible signature is sufficient depends on the document, agreement, and applicable law.

Want the full walkthrough? Read how to sign a PDF online with SuperTool, or browse more online PDF tools.