Signature Image, E-Signature or Qualified Signature?

“Sign it and send it back” sounds simple until you realize there are several very different things people call an electronic signature. A scribble pasted onto a PDF, a click on “I agree” and a signature made with a government-approved smart card all count as signing in everyday speech, but they carry very different weight. This guide explains the main types in plain language so you can tell which one a situation is asking for.

A picture of your signature

The most familiar kind is an image of a handwritten signature placed on a page. You draw it with a mouse or finger, type your name in a script font, or upload a scan of your signature, then position it where the signature line is. Visually, the document now looks signed.

Technically, though, that image is just another picture in the file. Anyone who has a copy of it can paste it into another document, and nothing in the PDF proves who placed it there or whether the text was changed afterward. What gives such a signature meaning is the context around it: an email thread showing who sent it, the fact that both sides acted on the agreement, a record in a business system.

That is often perfectly enough. Internal approvals, acknowledging that you received a document, returning a signed form to a landlord or school, or agreeing to a quote with a supplier you already work with are everyday cases where a signature image is widely accepted. Whether it would hold up in a dispute depends on the situation and the applicable law, not on how neat the signature looks.

Electronic signatures in the EU: SES, AES and QES

The European Union’s eIDAS Regulation sets out three levels of electronic signature that apply across member states.

• Simple electronic signature (SES): any data in electronic form attached to other data and used to sign. A typed name at the end of an email, a click on an accept button and a pasted signature image all fall here. eIDAS says a signature may not be denied legal effect merely because it is electronic, but its weight as evidence is up to the court.
• Advanced electronic signature (AES): must be uniquely linked to the signer, capable of identifying them, created with data under their sole control, and linked to the signed data so that any later change is detectable. In practice this usually means cryptographic signing with a certificate.
• Qualified electronic signature (QES): an advanced signature created with a qualified signature creation device and based on a qualified certificate issued by a qualified trust service provider. Under eIDAS, a QES has the equivalent legal effect of a handwritten signature, and one issued in one member state is recognized in the others.

Turkey: Law No. 5070 and the secure electronic signature

In Turkey, electronic signatures are governed by the Electronic Signature Law No. 5070. The central concept is the secure electronic signature (güvenli elektronik imza): one that is linked solely to the signer, created with a secure signature creation tool under the signer’s sole control, identifies the signer on the basis of a qualified electronic certificate, and makes later changes to the signed data detectable.

Qualified certificates are issued by electronic certificate service providers authorized under the supervision of the Information and Communication Technologies Authority (BTK). They are typically delivered on a USB token or smart card, and mobile signature services offered through mobile operators are another common form. The law states that a secure electronic signature has the same legal effect as a handwritten signature.

There are exceptions. The law excludes legal transactions that must be carried out in an official form or a special ceremony, as well as guarantee agreements, from being concluded with a secure electronic signature. Some transactions therefore still require a notary, a land registry office or another formal procedure regardless of which signature you use.

Which one does your document need?

The honest answer is: whatever the recipient and the law require for that particular transaction. A few rules of thumb can still help you avoid surprises:

• Read the instructions first. Courts, tax offices, e-government portals, tenders and banks usually state exactly what they accept. If they name a qualified certificate, a signature image will be rejected.
• Match the stakes. The more money, risk or legal consequence involved, the stronger the proof you want of who signed and that nothing changed afterward.
• Think about future disputes. For agreements that could be contested, keep the surrounding evidence: emails, timestamps, the version that was actually exchanged.
• Ask when unsure. A short question to the other party, or to a lawyer for important contracts, costs less than having a signature questioned later.

Adding a signature image with vupdf

The vupdf Sign PDF tool covers the everyday case: putting a visible signature on a document. You can draw your signature, type your name, create initials, or upload a stamp image as PNG or JPG with an option to remove its white background. You can also add the date and short text such as your name or “Read and approved”, choose black, blue or navy ink, and drag each item to the right spot on any page, resizing it as needed.

The tool says plainly what it is: it adds an image of your signature to the PDF and does not create a qualified or legally binding electronic signature. The file is processed on vupdf’s servers only to place the signature and is deleted as soon as the signed copy has been delivered to you.

Practical tips for signing with an image

• Sign the final version. Placing a signature and then editing the text undermines the point of signing.
• Avoid leaving a high-resolution image of your signature lying around in shared folders or email drafts where others could reuse it.
• If a page needs initials on every sheet, use initials rather than a full signature on each one, just as you would on paper.
• Keep a copy of exactly what you sent, together with the message you sent it with.

Summary

A signature image shows intent but proves very little on its own; simple electronic signatures in general rely on surrounding evidence. Advanced signatures add cryptographic proof of who signed and whether the document changed, and qualified signatures, which in Turkey means a secure electronic signature backed by a qualified certificate, are the ones the law treats like a handwritten signature. Use the lightweight option where it is accepted, and the qualified one where the law or the recipient demands it.