If you want to use inline encoding of icons for Presets, Styles or Rules here are some hints.

Examples:

• data:image/png;base64,...databytes...
• data:image/svg+xml;base64,...databytes...

You can use web tools to convert your image to the base64 code, e.g. ​base64-image.de.

Before you convert your image to the base64 code you should minify it to make the base64 a lot shorter (without loosing quality):

• for .png files: Use e.g. ​compresspng.com.
• for .svg files: Use e.g. ​svg cleaner. When using this one you can use the "complete" preset to clean up the svg file. More information about possible problems with svg in JOSM see DevelopersGuide/DefaultPresets.

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