Printing a contract just to sign it and scan it back in is slow, and the quality drops every time. With this Sign PDF tool you can draw your signature on screen with a mouse or finger, or upload a stamp or signature image you've already made (PNG or JPG), and drop it straight onto the document.
When you add a PDF, the tool reads its page count and automatically selects the last page for you. Sliders let you adjust the page to sign on, the horizontal and vertical position, and the size (10–60%), so you can line the signature up exactly with the signature field. On a phone or tablet, signing with a finger or stylus feels even more natural.
Everything runs entirely on your own device, so sensitive documents like signed contracts never leave your browser. The signature image you draw stays on your device too.
How to Use
- 1
Select a PDF
Add the PDF you want to sign. Up to 200MB, and the total page count is shown.
- 2
Create a signature
Draw your signature under 'Draw signature', or use 'Upload image' to add a stamp or signature PNG/JPG.
- 3
Adjust position & size
Use the sliders to set the page number, horizontal and vertical position, and size (10–60%).
- 4
Insert & download
Click 'Add signature' and download the signed PDF.
When It's Useful
Sign contracts & consent forms
Sign right on screen with no printing or scanning and send it straight back. It cuts the back-and-forth dramatically.
Apply a stamp image
Upload a transparent PNG stamp to place it on an approval document like an official seal.
Sign on the go from mobile
Sign a PDF you received on your phone with your finger while out of the office, and handle it on the spot.
Keep sensitive documents private
Sign a consent form containing personal ID details entirely on your device, without uploading it to a server, so there's no leak risk.
Tips
- Prepare your stamp or signature as a PNG with a transparent background so it sits naturally on the document.
- Signatures usually go at the bottom of the last page. That page is selected automatically, so you only need to set the position.
- On a phone or tablet, drawing with a finger or stylus gives a smoother signature.
- Size adjusts from 10% to 60%; 20–30% works well for a typical signature field.
- A JPG stamp may show its white background as a square, so a transparent PNG is recommended.
- Save the signed result PDF separately and leave the original untouched to make redoing easy.
FAQ
Is it legally binding?
An image-based signature is used by mutual agreement between the parties and differs from a certified digital signature. For documents where legal validity matters, check the method required by the other party or institution.
Can I sign in multiple places?
It adds one signature per pass. Re-upload the resulting PDF and repeat on another page or position to add signatures in several spots.
Should I draw the signature or upload an image?
For a one-off, drawing is faster; if you need the same stamp or signature every time, uploading a transparent PNG keeps it consistent.
What format works best for a stamp image?
A PNG with a transparent background is recommended. JPG works too, but its white background may show.
How precisely can I set the position and size?
You can set the horizontal and vertical position as percentages and the size from 10% to 60% with sliders, so it lines up exactly with the signature field.
Can I redo it if I draw it wrong?
Use the 'Clear' button to wipe the canvas and draw again.
Is my signature sent anywhere?
No. Both the drawn signature and the document are processed entirely in your browser and never sent to a server.
Is there a file size limit?
PDFs can be up to 200MB per pass.