Upload Signature Image - Free Online Browser Tool

Upload scanned signature PNG/JPG to stamp on pages.

If your signature already exists as a scanned or photographed PNG with a transparent background, you do not need to redraw it. This tool takes that image file and stamps it onto your document, sizing and positioning it like a real signature.

This upload signature image utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

Common next steps: Sign Multiple Pages, Multi-Page Signature Tool, Stamp Initials on All Pages.

How to Use the Upload Signature Image Tool

Four steps, and the whole thing runs locally on your own device.

  1. Add the PDF

    Drop in the document you need to sign.

  2. Upload your signature image

    Choose a PNG or JPG of your signature. A PNG with a transparent background gives the cleanest result.

  3. Position and scale it

    Drag the image onto the page and resize it to match the signature line, using opacity if it overlaps anything.

  4. Sign and download

    The signature image is composited onto the page and the signed PDF downloads.

Frequently Asked Questions

Which format works best?

PNG with a transparent background. A JPG has no transparency, so its white rectangle background will sit visibly on the page.

How do I get a transparent signature image?

Photograph your signature on white paper and remove the white background to transparency, or draw it once with a signature tool and use that instead.

Will the image be blurry when printed?

It depends on the source. A signature image captured at 300 DPI or higher prints cleanly; a low-resolution phone photo will look soft. Capture at high resolution and it will be fine.

Does the uploaded image stay on my device?

Yes. It is read locally in your browser and embedded into the PDF on your machine. Nothing is uploaded.

Can I use the same signature image on many documents?

Yes, load the same file whenever you need it. Keeping it as a transparent PNG makes that quick and consistent.