Which file format is suitable for sharing a legal contract that requires a digital signature?

The Portable Document Format (PDF) is the most suitable file format for sharing a legal contract that requires a digital signature because it preserves the original formatting of the document, ensuring that it appears exactly as intended on any device. Moreover, PDFs support digital signatures and incorporate security features that help verify the authenticity of the document and the identity of the signer. This capability is crucial in legal contexts, where the integrity and non-repudiation of the contract must be maintained.

Other formats, such as Word documents, may not retain the layout across different platforms and can be easily altered, which might compromise the integrity of a legal agreement. Text files lack formatting entirely and do not support digital signatures, making them unsuitable for formal legal documents. Excel spreadsheets, while capable of containing contractual information, are not typically used for legal agreements due to their structure and intended use. Overall, the PDF format stands out as the best option for legal contracts that require a digital signature due to its security features and consistent presentation.