Add a Signature to a PDF

How it works

The tool loads the document, selects the requested page, and embeds the standard Courier Oblique font supplied by the PDF specification. It measures the signature string against the page width, chooses a lower-right x-coordinate with a margin, and draws the name in a dark blue tone. If a date is entered, a smaller line is drawn below it. The document is then saved as a new PDF blob for download.

Using a standard font keeps the operation local and avoids downloading a font or sending the document to a rendering service. It also explains the boundary: this is text placed into page content, not an image of a handwritten signature and not a certificate signature. The source file remains available in the user's file system and is never overwritten by the page.

Use the right signing level

A visual typed mark can be appropriate for an internal approval, a draft review, a classroom exercise, or a document that the recipient has explicitly agreed can be signed this way. It is not the right tool for a contract that requires identity proof, tamper evidence, a certificate chain, a witness record, or a signing audit log.

After downloading, open the result and inspect the page position, date, names, and any nearby content. Retain the original and treat the signed copy as a new document. For regulated, financial, employment, legal, or high-consequence material, follow the organization's approved electronic-signature process instead of relying on a visual annotation.

What a typed mark actually proves

It helps to be blunt about this, because the word "signature" carries an assumption the output does not meet.

What this produces is text drawn onto a page. Anyone with a PDF editor can add the same text to the same document, remove it, or change the date, and nothing in the file records that it happened. The document does not know who made the mark and cannot tell whether it has been altered since.

A cryptographic signature is a different thing entirely. It computes a hash of the document, encrypts that hash with a private key tied to a verified identity, and embeds the result — so a reader's PDF viewer can confirm both who signed and that not one byte has changed since. That is what produces the green tick in Acrobat, and it requires a certificate from an authority that checked who you are.

Between the two sit the e-signature services, which do not use certificates but do keep an audit trail: the signer's email, IP address, timestamps, and a record of each view and click. In many jurisdictions that evidence is what makes an electronic signature enforceable, and it is exactly what a typed mark has none of.

So use this where the mark is a convenience between people who already trust each other and already agreed to work this way — an internal sign-off, a form a colleague asked you to initial, a draft. Where a dispute is conceivable, the question is not whether the file looks signed but what you could show a third party afterwards, and the honest answer here is nothing.

Check the placement before you send it

The signature is positioned by measurement, not by understanding the page, and that is worth one look before the file goes anywhere.

The tool measures your name against the page width and places it toward the lower right with a margin. It has no idea what is already there. On a page whose content ends halfway down, that is exactly right. On a page with a footer, a page number, a table running to the bottom margin, or an existing signature block, the text can land on top of something.

Landscape pages and unusual sizes are where this is most likely, because the lower-right region is proportionally different from the A4 and Letter portrait pages the margin was chosen for.

Two things to confirm in the downloaded file: that the name sits in clear space and is fully within the page rather than clipped at the edge, and that it is on the page you meant. Page selection is one-based and a document that opens on a cover sheet makes it easy to be one out. Neither error is subtle once you look, and neither is visible if you do not.