Sign PDF — Draw, Place, and Download in Seconds
Sign a PDF without printing, scanning, or uploading anything. Draw your signature with a mouse, trackpad, or finger — or upload an existing signature image — then click the pages of a live preview to place it exactly where you want. Drag to fine-tune, adjust the size and opacity, and download the signed document, all 100% in your browser.
Frequently Asked Questions About Signing PDFs
How does Sign PDF work?
You draw your signature on the pad (or upload an image), then click a live preview of any page to place it. Drag placements into position, resize them, tune opacity, and click "Sign PDF" to stamp everything onto the document with pdf-lib.
What if I make a mistake while drawing?
Click "Clear" to wipe the pad and start over. Placed signatures can be moved by dragging and removed individually with the × button.
Can I sign documents on my phone?
Yes — the signature pad responds to touch, so you can draw with a finger or stylus on any device with a touchscreen.
Are there limits on file size or page count?
No hard limits — the only constraint is your device memory. Even large documents sign instantly in the browser.