Someone sends you a PDF, asks for a signature, and suddenly a thirty-second task turns into a hunt through menus, subscriptions, and clumsy image boxes. SuperTool’s new Sign a PDF app makes that moment simple—without giving up the controls that matter when a signature has to land in exactly the right place.

Three ways to create a signature or initials

You can create both signatures and initials in three different ways:

• Draw: sign with a mouse, trackpad, stylus, or touchscreen, then choose the ink color and stroke width.
• Type: enter a name or initials, choose from four signature styles, and select an ink color.
• Upload: use a PNG, JPG, or WebP image of a signature. If the image has white paper behind it, the optional background-removal control can make the mark transparent.

Create a mark once and it stays available throughout the current editing session, so you can place it again without recreating it.

Precise placement instead of “close enough”

Many lightweight PDF signers let you add a signature but make accurate placement surprisingly difficult. SuperTool gives you direct controls for the work people actually need to do:

• Drag a signature anywhere on the page.
• Resize it proportionally from any corner.
• Rotate it from −180 to 180 degrees.
• Adjust opacity from subtle to fully opaque.
• Duplicate, copy, paste, or delete a placement.
• Undo and redo changes.
• Zoom in, zoom out, or fit the whole page in the editor.
• Nudge a selected mark with the keyboard, including quarter-pixel movement with Alt.

The placement system uses the PDF viewer’s page coordinates when creating the downloaded file. That helps the signature stay aligned even on cropped or rotated PDF pages.

Repeat the same signature across several pages

Signing or initialing a long document should not mean repeating the same manual placement over and over. After placing a mark, choose Repeat and enter one page such as 2, several pages such as 2, 5, 9, a range such as 4–7, or all for every page.

SuperTool keeps the placement visually consistent while accounting for pages with different dimensions.

How to sign a PDF online with SuperTool

1. Go to SuperTool Sign a PDF.
2. Upload a PDF up to 100 MB.
3. Choose Add signature or Add initials.
4. Draw, type, or upload the mark, then choose Save & place.
5. Drag the mark into position and adjust its width, rotation, or opacity.
6. Add more placements or repeat the selected one across other pages.
7. Review the page thumbnails and download the signed PDF.

The first PDF page renders before the rest of the thumbnails, so even a larger document becomes usable quickly. Nearby thumbnails then load in the background as you work.

Privacy without vague promises

SuperTool renders and edits the PDF in your browser. Your reusable signature and initials assets are not saved as a profile or sent to a third-party signing vendor.

When you click download, the completed PDF is briefly transferred to SuperTool’s own application server so it can be validated, checked against your SuperTool account access, and delivered securely. Those session files are removed when the session ends.

That is a practical privacy boundary: browser-based editing, no separate storage of your signature asset, and no third-party signing service in the workflow.

Visible signatures versus certificate-based digital signatures

Sign a PDF adds a visible signature or initials to the document. It does not issue a cryptographic certificate, verify the signer’s identity, or replace a specialized regulated e-signature platform. Whether a visible signature is appropriate depends on the document, your agreement with the other party, and applicable law.

For everyday forms, approvals, acknowledgments, and documents that simply need a visible signature or initials, the focused workflow is often exactly what you need.

Ready to sign?

Skip the oversized PDF suite. Sign your PDF online with SuperTool, place every mark with precision, review the result, and download the finished document. You can also browse the complete collection of online PDF tools.