Short answer: yes, for the overwhelming majority of agreements a South African business signs. The longer answer is worth knowing, because “legal” and “defensible when someone disputes it” are two different bars, and only one of them is about the law.
What the ECT Act says
The Electronic Communications and Transactions Act, 2002 gives data messages and electronic signatures legal recognition. Where the law requires a signature and does not specify how, an electronic signature satisfies it. In practice that covers service agreements, NDAs, employment contracts, engagement letters, mandates, consent forms, purchase orders and the rest of ordinary commercial paperwork.
The Act also draws a line between an ordinary electronic signature and an advanced electronic signature - one issued by an accredited authority. A handful of instruments require the advanced kind, or ink and a witness.
Where you still cannot use one
- Wills and codicils.
- Transfer of immovable property - the deed of alienation itself.
- Bills of exchange, such as cheques.
- Long-term leases of land exceeding 20 years.
- Suretyships in some contexts, and anything a specific statute says must be signed in the presence of a witness or commissioner.
If a document falls in that list, or you are unsure, ask a lawyer. This post is a starting point, not legal advice.
What actually makes a signature hold up
Recognition in law is the easy part. The hard part is evidence: if the other side later says “that was not me”, what can you show? That is a question about records, not statutes, and it is where the difference between emailing a PDF back and forth and using a signing platform shows up.
Three things carry the weight:
- Identity - evidence that the person who signed is the person you sent it to. A unique, single-use link to one email address is the baseline. A one-time code emailed to that address before the document opens is stronger, and worth switching on for anything valuable.
- Intent - evidence that they meant the mark to be their signature, which is why there is a consent step rather than just a drawing canvas.
- Integrity - evidence that the document has not changed since. Signatures are flattened into the PDF, the executed copy is stored separately from the original, and the audit trail is sealed alongside it.
Keep the trail, not just the PDF
A signed PDF on its own is a picture of an agreement. What makes it defensible is everything around it: who opened it, from which IP address, on what device, at what time, and what they consented to at the moment they signed. Keep the certificate of completion with the document - it is the part a dispute actually turns on.
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