Imposm3 is an importer for OpenStreetMap data. It reads PBF files and imports the data into PostgreSQL/PostGIS databases. It is designed to create databases that are optimized for rendering/tile/map-services.

It is developed and supported by Omniscale and is released as open source under the Apache Software License 2.0. Imposm3 is a rewrite of Imposm 2 with even better performance and support for (minutely) diff updates.


Custom database schemas
It creates separate tables for different feature types. This allows easier styling and better performance for rendering in tile or WMS services.
Multiple CPU/core support
Imposm is parallel from the ground up. It distributes parsing and processing to multiple CPUs/cores.
Unify values
For example, the boolean values 1, on, true and yes all become TRUE.
Filter by tags and values
It only imports data you are going to render/use.
Efficient nodes cache
It is necessary to store all nodes to build ways and relations. Imposm uses a file-based key-value database to cache this data. This reduces the memory usage.
Generalized tables
It can automatically create tables with lower spatial resolutions, perfect for rendering large road networks in low resolutions for example.
Limit to polygons
It can limit imported geometries to polygons from GeoJSON.
HStore support
Don’t know which tags you will be needing? Store all tags in an HStore column.


There is a mailing list at Google Groups for all questions. You can subscribe by sending an email to:

For commercial support contact Omniscale.


The source code is available at:

You can report any issues at: