What is a .O5M file?
O5M is a compact binary form of OpenStreetMap data, used by osmconvert.
- Did you know
- O5M speeds up processing of large OpenStreetMap extracts.
- O5M mirrors the structure of plain OSM XML but stores everything as binary numbers, making it far more compact.
- It borrows delta coding from the PBF format, recording each id as the small difference from the previous one rather than the full value.
- What Analyser reads
- Identify and read more GIS and mapping files: OpenStreetMap o5m/o5c binaries, Esri layer files (.lyrx ArcGIS Pro CIM JSON, .lyr ArcMap), QGIS projects (.qgs/.qgz - version, CRS, layer list), shapefile spatial indexes (.sbn/.sbx), GMT/GDAL colour palettes (.cpt) and ENVI band-interleaved rasters (.bil/.bip/.bsq).
- Depth of analysis
- .O5M is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .O5M file
- Drag a .O5M file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.