Quick Start

Get started with Lankir in 5 minutes.

Launching the Application

GUI Mode

Run Lankir without arguments to launch the graphical interface:

lankir

Or double-click the AppImage/desktop shortcut.

Lankir main window after launch

Lankir main window with welcome screen

CLI Mode

Pass any argument to use CLI mode:

lankir pdf info document.pdf

Opening a PDF

Via GUI

  1. Click File → Open or press Ctrl+O

  2. Select a PDF file from the file browser

  3. The PDF opens in the main viewer

PDF document open in viewer

PDF document displayed with thumbnail sidebar

Via CLI

# View PDF information
lankir pdf info document.pdf

# Render a specific page
lankir pdf render document.pdf --page 1 --output page1.png

Via Drag & Drop

Drag a PDF file from your file manager and drop it on the Lankir window.

Signing Your First PDF

Prerequisites

You need a digital certificate from one of these sources:

  • PKCS#12 file (.p12 or .pfx)

  • Hardware token (smart card, USB token)

  • Browser certificate store (Firefox/Chrome NSS database)

Quick Sign (GUI)

  1. Open a PDF document

  2. Click Sign in the toolbar

  3. Select a certificate from the dropdown

  4. Enter PIN if required

  5. Click Sign Document

Signature dialog with certificate selection

Signature dialog showing certificate selection and profile options

The signed PDF saves as original_signed.pdf.

Verify Signature

To verify an existing signature:

lankir sign verify signed_document.pdf

Or in the GUI, open the PDF and check the signature panel.

Viewing Certificate Information

List available certificates:

# CLI
lankir cert list

# Show only valid certificates
lankir cert list --valid-only

In the GUI, go to Settings → Certificates to browse all available certificates.

Configuration

Lankir stores settings in ~/.config/lankir/config.json.

Common Settings

# View current config
lankir config get

# Change theme
lankir config set theme dark

# Set default zoom
lankir config set defaultZoom 125

Next Steps

Now that you have the basics: