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Authors: Immanuel Scholz, Dirk Stöcker and other contributors.
License: GNU General Public License
Platforms: Windows, Linux, and macOS
Version: 15238 (2019-07-10)
Languages: Asturian, Bulgarian, Catalan, Valencian, Czech, Danish, German, Greek, English, Canadian English, Australian English, British English, Spanish, Estonian, Basque, Finnish, French, Galician, Hungarian, Indonesian, Italian, Japanese, Khmer, Norwegian Bokmål, Dutch, Polish, Portuguese, Brazilian Portuguese, Russian, Slovak, Swedish, Turkish, Ukrainian, Uzbek, Vietnamese, Simplified Chinese, and Traditional Chinese
Source code:
Programming language: Java

Offline highly expandable map editor

JOSM logo since August 2019

JOSM (Java OpenStreetMap Editor) is a desktop application originally developed by Immanuel Scholz and currently maintained by Dirk Stöcker. Its homepage is located at

Although it has a relatively steep learning curve, JOSM is popular among experienced editors thanks to its plugins and stability. There are other editors for OpenStreetMap data, like iD or Potlatch 2. JOSM is a feature-rich editor with an interface which can seem complex at first. If you are unsure which editor to use, see the Comparison of editors article.


JOSM can be downloaded from the JOSM homepage. Many Linux distributions offer JOSM packages. See JOSM/Linux. It can be run as a local Java installation or with Java WebStart, which causes the latest version to be fetched over the Internet each time the program is run. Java version 1.8, minimum, is required to run JOSM as of 2017. The site security certificates for JOSM WebStart are invalid and will generate multiple warnings during startup, requiring the user to accept exceptions several times before the program is ready to use.

See subpage Installation for more details


JOSM screenshot, editing in Cleveland, Ohio, USA


The Guide will take you through getting started, downloading some data, basic editing and more advanced editing features. It is intended for beginners to read the guide from the beginning. This is a descriptive guide providing a simple introduction. Some details are intentionally left out.


Will cover common questions.

Video Tutorials

Main article: Video_tutorials#JOSM_video_collection

Currently there no good and up-to-date video tutorial to recommend here. Please make a good one or let us know about recent video materials.

Help with JOSM

The JOSM Help manual should provide more exhaustive in-depth explanations of each JOSM feature. It is intended to be used as a reference manual, rather than reading from end-to-end. It is also accessible by pressing F1 within the application (context sensitive help)

See also

See subpage Plugins for optional extensions that can be downloaded and installed in JOSM