Argentina's e-signature framework rests on three pillars: Ley 25.506 (the Digital Signature Law), its implementing regulation Decreto 182/2019 (as amended by Decreto 743/2024), and Article 288 of the Civil and Commercial Code.

Ley 25.506 draws a binary distinction rather than the three-tier SES/AES/QES model used in the EU and Brazil. Firma electrónica covers any electronic data used by a signer for identification that doesn't meet the technical requirements of a digital signature; it's valid and enforceable, but if challenged, the burden of proving its reliability and authorship falls on the party relying on it. Firma digital sits above it: a signature created with a certificate issued by a certifier licensed under the Autoridad Certificante Raíz de la República Argentina (root certifying authority), such as AC ONTI. Articles 7 and 8 of Ley 25.506 give firma digital an automatic legal presumption of authorship and integrity, the same evidentiary shortcut eIDAS reserves for QES. Article 288 of the Civil and Commercial Code reinforces this at the general contract-law level: the signature requirement for an electronic instrument is satisfied whenever the method used reliably establishes authorship and document integrity.

A narrow set of acts falls outside this framework entirely. Public deeds (escrituras públicas), wills, and certain family law acts require a notary rather than any tier of electronic signature. Most transactions with the federal government also fall outside standard e-signature: administrative acts processed through the GDE (Gestión Documental Electrónica) platform specifically require firma digital under Article 9 of Ley 25.506. Outside these categories, ordinary commercial contracts, employment agreements, NDAs, and software licenses are fully valid with a standard electronic signature.

Decreto 743/2024, published in August 2024, modernized how firma digital certificates get issued. Before the reform, applicants had to appear in person before a licensed certifier's registration authority to have their fingerprints and photograph captured. The decree now allows remote identity verification using real-time validation against the national identity registry, removing the in-person requirement and delegating identity-validation functions to registration authorities under each certifier's responsibility.

For data protection, Argentina's Ley 25.326 (2000) is enforced by the AAIP (Agencia de Acceso a la Información Pública), which also administers the RNBD (Registro Nacional de Bases de Datos): any organization processing Argentine residents' personal data, even from outside the country, must register its databases there. On cross-border transfers, Argentina keeps its own list of jurisdictions it considers adequate, and the EU/EEA is on it, so data can flow from Argentina to EU-hosted infrastructure without additional safeguards. The relationship runs the other way too: the European Commission first recognized Argentina as providing adequate data protection in 2003, the first such recognition for a Latin American country, and reconfirmed it on January 15, 2024 after a periodic review. For an EU-hosted processor like Firma.dev, this removes the main open question around handling Argentine signers' data, though it covers the transfer mechanism specifically rather than certifying every Ley 25.326-specific processing requirement independently. A bill to fully replace Ley 25.326 (1751-D-2026) was introduced in April 2026 and remains in committee. Worth monitoring, but not yet law.