Files with prj suffix can also be found as ArcView Shapefiles in projection format. Used in GIS software ArcView from ESRI. Definition file.

There is one other file type using
the PRJ file extension!

prj file icon.prj - Project file [common]

Detailed description

Software that works with prj file extension

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PRJ file extension - ArcView Shapefile projections definition file

What is prj file? How to open prj files?

File type specification:

GIS, GPS navigation and map file type icon GIS, GPS navigation and map file type

File extension prj is also associated with ArcView Shapefile projection format; the coordinate system and projection information, a plain text file describing the projection using text format.

The projection information contained in the .prj file is critical in order to understand the data contained in the .shp file correctly. Although it is technically optional, it is most often provided, as it is not necessarily possible to guess the projection of any given points. Some typical information contained in the .prj file is:

  • Geographic coordinate system
  • Datum
  • Spheroid
  • Prime meridian
  • Map projection
  • Units used

The ESRI Shapefile is a popular geospatial vector data format for geographic information systems software. It is developed and regulated by ESRI as a (mostly) open specification for data interoperability among ESRI and other software products. A shapefile commonly refers to a collection of files with .shp, .shx, .dbf, and other extensions on a common prefix name (e.g., "lakes.*"). The actual shapefile relates specifically to files with the ".shp" extension, however this file alone is incomplete for distribution, as the other supporting files are required.

Shapefiles spatially describe geometries: points, polylines, and polygons. These, for example, could represent water wells, rivers, and lakes, respectively. Each item may also have attributes, that describe the items, such as the name or temperature.

The default software associated to prj file type:

ArcGIS for Desktop Basic (ArcView) icon

Esri logo ArcGIS for Desktop Basic (ArcView)  Microsoft Windows software

Company or developer:
  Esri

ArcGIS for Desktop Basic (formerly known as ArcView) is GIS (geographic information system) application used to visualizing, managing, creating, and analyzing geographic data.

ArcGIS for Desktop Basic is a part of the ArcGIS Desktop. ArcGIS for Desktop Basic supports creation of interactive maps, spatial analysis, GIS deployment, map viewing and navigation, map printing etc.

Help how to open PRJ files:

ESRI ArcView should be able to work with this type of .prj files.

How to convert file with extension PRJ:

Possibly can be exported and saved in ArcView along with with other GIS data.

List of software applications associated to the .prj file extension

Recommended software programs are sorted by OS platform (Windows, Mac OS X etc.) and possible program actions
that can be done with the file
: like open prj file, edit prj file, convert prj file, view prj file, play prj file etc. (if exist software for corresponding action in File-Extensions.org's database).

Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting of the prj files.

  • Open prj file
  • View prj file
  • Others prj file

Software that open prj file - ArcView Shapefile projections definition file

Click on the link to get more information about ArcGIS for Desktop Basic (ArcView) for open prj file action.

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