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HiDPI support
This page contains information on how to use JOSM with a high-resolution display.
Basics
- Proper HiDPI-support was added with Java 9, so make sure you are running Java 9 or later.
- 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 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.
GDK_SCALE=2 java -jar josm.jar
