Software · Office & notes

DigiDoc4 Client

Estonian ID-card desktop application.

Completely free
Windows and Linux
Open source
No account

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download from the official source

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Flathub, Winget (Windows Package Manager)
License: LGPL-2.1+ — Open source (copyleft)confirmed by Flathub, Winget (Windows Package Manager)
Open source: Yes
Commercial use: Yesconfirmed by Official plan pages (pricing, licence, terms), Flathub, Winget (Windows Package Manager)
Account required: Noconfirmed by Winget (Windows Package Manager)
Credit card required: Noconfirmed by Flathub, Winget (Windows Package Manager)
Watermark: Not applicable
Ads: not documented
Platforms: Windows and LinuxEstablished by Linux: Flathub · Windows: Winget
Publisher: Information System Authority of Estonia
Latest version: 4.11.1 (2 September 2026)
Latest activity: 31 October 2026
Source code: github.com/open-eid/DigiDoc4-Client

Overview

Features described in its Flathub listing and in its Winget manifest: document signing.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Using an ID-card, Mobile-ID, or Smart-ID, it can sign, encrypt, and decrypt documents and files, and check the validity of digital signatures.” — Flathub, 10 November 2026

At a glance

DigiDoc4 Client is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (LGPL-2.1+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

About

DigiDoc4 is an application for interacting with the Estonian ID system. Using an ID-card, Mobile-ID, or Smart-ID, it can sign, encrypt, and decrypt documents and files, and check the validity of digital signatures. It can also view information stored on ID cards and change the PIN1, PIN2 and PUK codes. Digitally signed containers use .ddoc, .bdoc or .asice extensions, and encrypted/decrypted files use the .cdoc extension.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 10 November 2026
Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 9 November 2026
Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) — 8 November 2026
Last technical check: 8 November 2026
Description from Flathub — AppStream (Flathub)

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