Sign PDF

What this tool does

Sign PDF lets you create a signature with a mouse, finger or stylus, type your name in a script style, or upload a signature image, then drag it into place on one or more pages and add the date. The signed PDF is produced in your browser.

Printing a form, signing it with a pen and scanning it back takes time and produces a blurry, oversized file. For many everyday documents, such as tenancy forms, permission slips, timesheets or supplier agreements, an image of your signature placed on the page is all that is asked for.

This tool captures your signature as a transparent PNG, either drawn on a canvas, rendered from typed text in a script-style font, or taken from an image you upload. You position it on a rendered preview of the page, and pdf-lib embeds the image at exactly that spot in the original PDF. The document never leaves your device. The result is a visual electronic signature, not a certificate-based digital signature.

How to use Sign PDF

1. Drop the PDF you need to sign onto the upload area.
2. In Your signature choose Draw, Type or Upload, and create your signature. Pick an ink colour if you like.
3. Optionally switch on the date and choose a date format.
4. Go to the page that needs signing using the page arrows or number box.
5. Set the signature width and press Add to this page, then drag the signature onto the signature line.
6. Repeat on other pages if needed, then press Save signed PDF and download the file.

Tips for better results

• Dark blue ink (the default) makes it obvious which marks were added after printing.
• Draw your signature larger than you need; it is trimmed and scaled to the width you choose without losing smoothness.
• Focus a placed signature and use the arrow keys for fine positioning; hold Shift for bigger steps, or press Delete to remove it.
• For an uploaded image, a scan on white paper works, but a transparent PNG avoids a white box over the signature line.

Common use cases

• Signing a tenancy, school or club form that was sent as a PDF.
• Approving timesheets, invoices or delivery notes.
• Initialling every page of a contract by placing a small signature on each page.
• Returning a signed offer letter quickly from a phone.

Common mistakes to avoid

• Using this for documents that legally require a qualified or certificate-based digital signature. Check what the recipient accepts.
• Leaving the signature at its default position instead of moving it onto the signature line.
• Signing the wrong version of a document. Check the page preview before you save.