Electronic Signature vs Digital Signature: What's the Difference?
By the FreePDF team ·
The two terms get swapped constantly, including by software vendors, and they don't mean the same thing. An electronic signature is about showing you agreed. A digital signature is a specific piece of cryptography that proves who signed and whether the file changed afterwards. Most documents only need the first. Some recipients insist on the second, and it helps to know which you're dealing with before you send anything.
Electronic signature: any sign that you agreed
This is the broad category. Typing your name at the bottom of an email counts. So does ticking an "I agree" box, clicking Accept on a rental portal, or drawing your signature with a finger and placing it on a PDF. What makes it a signature is intent: you did something to show you accept the document.
The weakness is that the mark itself proves very little. A signature image is just a picture. Anyone with a copy could paste it onto a different page, and nothing in the file records who placed it or when. In practice, the evidence comes from around the signature: the email thread, a login record, the fact that both sides acted on the agreement.
Digital signature: a certificate and a checksum
A digital signature works differently. Signing software takes a fingerprint of the exact file and encrypts it with your private key. Your certificate, usually issued by a certificate authority that has checked your identity, travels with the signature. Anyone opening the file can then confirm two things.
- The signature was made with the key tied to that certificate.
- The document hasn't been altered since. Change a single character and validation fails.
In Acrobat you see this in the Signatures panel, with a banner saying whether the signatures are valid or the document has been modified. Some digital signatures are also invisible; there's no scribble on the page, only the cryptographic record.
Which kind our Sign PDF tool makes
Our tool creates an electronic signature. You draw your signature or upload a PNG or JPG of it, drag it into place on one page, and we stamp that image onto the PDF. There's no certificate, no identity check and no tamper seal. The result looks signed, and for a lot of paperwork that's exactly what's needed.
When the simple kind is usually enough
- Internal forms like expense claims and leave requests.
- Everyday agreements where the other side just wants a signed copy back, such as a freelance quote or a club membership form.
- Delivery confirmations and school permission slips.
Plenty of legal systems accept electronic signatures in general terms. In the US, the federal ESIGN Act and the state-level UETA say a signature can't be refused legal effect just because it's electronic, though both carve out certain document types. In the EU, the eIDAS regulation defines tiers, from basic electronic signatures up to qualified electronic signatures, which rely on a qualified certificate and a certified signing device and carry the same legal effect as a handwritten signature across member states.
When you may need a certificate-based signature
Some government portals, tax and customs filings, tenders, and regulated industries like healthcare or finance ask for a digital signature, sometimes from a specific provider or at the qualified level. The request will usually say so in plain terms. If it doesn't, ask the recipient what they accept, and for anything with legal weight, check what your jurisdiction requires. We can't tell you which kind your document needs.
Mixing the two
Order matters. If you add a visible signature image and then need a digital signature too, stamp the image first. Our tools rewrite the PDF, so running a digitally signed file through Sign PDF or Protect PDF afterwards will break the existing signature. Password protection is a separate job anyway. It controls who can open the file, not who signed it.
Common questions
Is a scanned wet signature electronic or digital?
Electronic. Once it's a picture in a PDF, it's the same thing as a drawn or uploaded signature image. The ink origin doesn't add any cryptographic proof.
How do I get a digital signature?
You need a signing certificate and software that can apply it, such as Acrobat or a dedicated signing service. Some countries issue them through national ID cards. A self-signed certificate works technically, but recipients' software won't show it as trusted.