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= Edit > Purge... =
[[JOSMImage(purge)]] ''Keyboard shortcut'': **`Ctrl+Shift+P` ([ExpertMode expert mode] only)**

The purge action cleans up your data layer by removing the selected [Concepts/Object objects] from the layer. However, in contrast to the [[JOSMImage(dialogs/delete,20)]] [Action/EditDelete delete action], they **will not be deleted in OSM database** on the server when you upload your changes. 

It is, as if JOSM completely forgets about these objects and they never had been downloaded.


== Warnings ==
=== Dependent objects ===
When you purge a node of a way, that way cannot exist without its nodes, so it has to be purged as well. JOSM will give a warning in this case and lets you inspect the objects that need to be purged in addition to the original selection.

The same holds, if you like to purge a new object (id:0) that is member of a relation. Members with a positive id can be purged without affecting the relation. Their status will be ''{{{incomplete}}}'' after purging.

If you get this warning, you can safely proceed, but be aware that more objects are purged, than originally selected.

=== Modified objects ===
If you purge modified objects, these edits are lost. This can be intended, but you will get a warning in this case.


== Clear Undo/Redo buffer ==
This option is supposed to free resources (memory). But don't rely on it (yet). If you are short of memory, it is still the best option to [[JOSMImage(save,20)]] [Action/Save save] the (partially purged) layer and reopen it in another instance of JOSM.


== See also ==

* [[JOSMImage(dialogs/delete,20)]] [Action/Delete Delete]
* [Concepts/Object Objects]

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