> For the complete documentation index, see [llms.txt](https://docs.signius.eu/manuals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.signius.eu/manuals/harmony-desktop-en/introduction.md).

# Introduction

SIGNIUS Harmony is a local desktop component for eIDAS compliant remote signing with Qualified Electronic Signatures.

Besides SIGNIUS Harmony, you'll also need an application that allows you to place and submit your digital signature to a document or file. 

### Overview

This documentation describes how to:

* Install SINIUS HARMONY Desktop app on your computer.
* Logon-on and Log-off
* Sign PDF, MS-Word, PAdES (PDF in SECUREDOC), XAdES (XML in SECUREDOC) documents
* Request support