Add Signature

Adding a signature to a PDF lets you sign agreements, forms and letters without printing, signing by hand and scanning back. It saves time and keeps the whole process digital.

ColaPDF lets you draw your signature directly on a canvas with a mouse, trackpad or touchscreen, or upload a transparent PNG of an existing signature, then place it precisely on the page. Everything stays in your browser, so your signature is never stored on a server.

How it works

1. Upload your PDF
2. Draw your signature on the canvas using mouse or touch, or upload a PNG image
3. Choose position and size
4. Click Apply Signature and download the signed PDF

Tips

• A transparent PNG signature blends most naturally onto the document.
• Drawing on a touchscreen or tablet gives a smoother, more natural signature line.
• This adds a visible signature image; it is not a cryptographic digital signature.

Frequently asked questions

Is my signature uploaded anywhere?

No. The signature is applied locally in your browser and never transmitted.

Can I apply the signature to all pages?

Yes — choose "All pages" in the placement options.

What file format should my uploaded signature be?

PNG with a transparent background gives the best result.

Is this legally binding?

This tool adds a visual signature image. For legally binding e-signatures consider a dedicated e-signature service.