Is a handwritten agreement between two parties legally valid?

Yes, a handwritten agreement is generally just as legally valid as a typed one, as long as it contains the essential elements of a valid contract (offer, acceptance, consideration, and intention to be legally bound) and is properly signed by both parties — the format itself, handwritten versus typed, doesn't affect its underlying enforceability.

What matters more is that the terms are clearly and unambiguously written, since a poorly worded or incomplete agreement — whether handwritten or typed — can create disputes over what was actually intended, which is really the more important practical concern than the format.

For certain specific types of transactions (such as those involving transfer of immovable property), the law may require additional formalities like registration, regardless of whether the document is handwritten or typed. If your handwritten agreement covers something significant, it would still be worth having a lawyer review it to make sure it's clear, complete, and appropriately covers the key terms and contingencies relevant to your arrangement.