JOSM is an extensible editor for ​OpenStreetMap (OSM) for ​Java 11+. It supports loading GPX tracks, background imagery, and OSM data from local sources as well as from online sources and allows to edit the OSM data (nodes, ways, and relations) and their metadata tags. JOSM is open source and licensed under GPL​.
Start josm.jnlp (newest tested version, currently 19253) Preferred distribution channel, all platforms, monthly automatic update (how to start; changelog)
Download josm-tested.jar (version 19253) All platforms (how to run; changelog)
Windows MSI installer, Windows EXE installer (version 19253), or from ​Microsoft Store (see how to install)
macOS app (version 19253), or use ​homebrew (see how)
Development version of josm-latest.jnlp or josm-latest.jar (version 19259), ​macOS dev builds, Ubuntu repository and all Download options.

Getting Started

• The Introduction page will guide you to your first successful edit.
• See the official help system – <F1> reaches it everywhere on JOSMs interface and the help button in dialogs.
• Ask members of the OpenStreetMap community on
  • the ​OSM-forum
  • OpenStreetMap's ​question-and-answer site
  • various ​OSM mailing lists (e.g. ​talk, ​list overview)
  • the ​OSM IRC channel, including our ​own room

Extensions

• Plugins add more complex program features. (installation instructions)
• Presets allow you to select predefined tags for objects. (installation instructions)
• Rules check and fix invalid data. (installation instructions)
• Styles change the appearance of the mapview. (installation instructions)
• Backgrounds allow you to trace OSM data from e.g. aerial imageries. (installation instructions)

Recent changes

• Startup notes (most important changes)
• Summarized changelog (nicely summarized)
• SVN changelog (complete log)

Found a bug? | Have an idea? | Make a suggestion? | Like to contribute?

• Report any bug found! Via the Report Bug form in the Help menu it is easy.
• Create and discuss ideas and enhancements as ticket and contact the team.
• Contribute with updates, corrections and translations to unify all JOSM-related pages and join them with the online help.
• Participate in bug tracking with reviewing bugs, up/down vote tickets, find duplicates, test bugs, add more descriptive texts.
• Design fancy new icons.
• Develop OSM by getting the source. See the developers guide for build instructions and other details.

This site

• This site is a combined help and bug tracking system for JOSM and JOSM plugins.
• No login is required to use this site (neither for reading nor for editing the wiki or the bug tracker).
• But logging in has advantages:
  • Mail is sent for changes in your bug tracker tickets. This is possible by entering an e-mail as a username in the tickets too, but then be aware that the address is openly visible and you are unable to change that later.
  • Page settings are remembered (e.g. input field size and a lot of other stuff).
• Logins that have no e-mail address or which have not been used at least once are automatically deleted.
• Accounts to edit the OpenStreetMap database are separate from the logins on this server.
• Copyright (CC-BY-SA and LGPL since April 2014) of this site is stated in the footer.

Certificates

• JOSM wiki page is using a Let's Encrypt certificate which is permanently renewed (certs/josm.openstreetmap.de.crt).
• JOSM JAR release files are signed with a private certificate (certs/josm.openstreetmap.de_code.crt) from a private CA (certs/stoecker2023.pem). You'll may have to accept a warning at least once.
• JOSM GitHub files and Windows version are signed with a private certificate (certs/josm.openstreetmap.de_code_github.crt) with same CA. You'll may have to accept a warning at least once.
• JOSM MacOS software is signed with an Apple certificate (certs/josm.openstreetmap.de_code_apple.crt).
• JOSM Repository is signed with an individual OpenPGP key (https://josm.openstreetmap.de/josm-apt.key).

Contact

Server sponsored by:

• The volunteers creating JOSM can be reached using the ​josm-dev mailing list or the ​#josm IRC chat.
• If you use social networks, see our ​Mastodon, ​Facebook and ​Twitter pages.