= HiDPI support =

This page contains information on how to use JOSM with a high-resolution display.

== Basics ==

1. Proper HiDPI-support was added with Java 9, so make sure you are running Java 9 or later.
2. JOSM version r12722 or later is required.

You can expect best results with even scale factors, e.g. 200%, 400%, ... but other values are supported as well.

== How to enable HiDPI mode ==

If HiDPI mode is not enabled out-of-the-box, here are ways to activate it.

=== Windows ===

On Windows, you can activate scaled display mode for the system-wide. See for example [http://pccleaningtools.com/how-to-enlarge-display-text-in-windows this] extensive help page.

For Windows 7, the option is called ''Display / Set custom text size (DPI)'', for Windows 8 it is called ''Display / Change the size of all items'' and for Windows 10 it is ''Display / Customize your display / Change the size of text, apps, and other items''

=== Linux ===

You can activate HiDPI-mode for one application by running it with the `GDK_SCALE` environment variable set to 2, 4, ..., e.g.
{{{#!bash
GDK_SCALE=2 java -jar josm.jar
}}}