abz

.abz — Astral A-Code Binary

Esri · 2009

Developer
Esri
Category
GIS & Maps
MIME Type
application/vnd.esri.arcgis-cache
First Released
2009
Open Format
No
File Signature
Not consistently defined as a unique header; typically identified by content structure within a ZIP archive.
At a Glance
.abz
Astral A-Code Binary

.abz files are proprietary cache files used by Esri ArcGIS to store map tile data for faster geographic visualization and offline use.

Reviewed on May 30, 2026
Compression
Compressed (ZIP)
Transparency
Yes (tiles can have transparency)
Editability
Low
Best for
Map caching

Key Features

  • Stores pre-rendered map tiles for quick display.
  • Enables offline access to geographic data.
  • Optimizes performance of GIS applications.
  • Proprietary format developed by Esri.

Best For

  • Optimizing map rendering speed in ArcGIS.
  • Providing cached map data for offline use.
  • Reducing network load when accessing map services.

Less Ideal For

  • General image storage (use JPG, PNG, etc.).
  • Vector data storage (use SHP, GeoJSON, etc.).
  • Editing map data directly.
  • Sharing with non-Esri GIS software without conversion.

Common Use Cases

  • Offline map viewing in ArcGIS applications.
  • Faster loading of complex geographic maps.
  • Distributing map data for mobile field use.
  • Caching map services for improved performance.

How to Open It

  1. Open the .abz file directly within Esri ArcGIS Pro or ArcGIS Desktop.
  2. Use the 'Export Map' or 'Share As Web Layer' tools in ArcGIS to access the cached map data.
  3. For programmatic access, use the ArcGIS API for Python or JavaScript to read tile caches.
  4. While not standard, some GIS tools might offer import/export options for cached map data.

What is a .abz file?

An .abz file is a proprietary cache file used by Esri's ArcGIS software to store map tile data for faster rendering and offline access. It's essentially a compressed archive containing image tiles and metadata. This format allows ArcGIS applications to quickly display complex geographic maps by pre-loading the necessary visual components. While not intended for direct user editing, it plays a crucial role in optimizing the performance of GIS applications, especially when working with large datasets or in environments with limited internet connectivity.

Programs That Open .abz Files

PlatformProgram
WindowsArcGIS ProPaidOfficial
ArcGIS Desktop (ArcMap)PaidOfficial
macOSArcGIS ProPaidOfficial
AndroidArcGIS Field MapsFreeOfficial
ArcGIS ExplorerFreeOfficial
iOSArcGIS Field MapsFreeOfficial
ArcGIS ExplorerFreeOfficial

How to Convert .abz Files

FormatMethod
.PNGArcGIS Pro Export Map, ArcGIS API
.JPGArcGIS Pro Export Map, ArcGIS API

Common Problems with .abz Files

⚠️ Cannot open .abz file outside of ArcGIS.
This format is proprietary and designed for ArcGIS applications. Use ArcGIS tools to export the map data into a more standard format like PNG, JPG, or MBTiles if you need to use it elsewhere.
⚠️ File is too large.
.abz files can grow large as they store many tiles. Consider recreating the cache with a smaller extent, fewer zoom levels, or exporting specific layers instead of the entire map.

Frequently Asked Questions

Can I edit the content of an .abz file?▼

No, .abz files are read-only cache files and are not intended for direct editing. You would need to edit the original GIS data sources and then regenerate the .abz cache.

What is the difference between .abz and .tpk (vector tile package)?▼

.abz files typically store raster (image) tiles, while .tpk files store vector tiles which can be more flexible and scalable but require compatible renderers.

Is .abz an open standard?▼

No, .abz is a proprietary format developed and used by Esri for its ArcGIS software ecosystem.

Technical Details

Internally, .abz files are ZIP archives containing a series of image tiles (often in PNG format) organized in a hierarchical structure based on zoom levels and geographic extents. They also include metadata that helps ArcGIS quickly locate and display the appropriate tiles. The compression used is standard ZIP compression, making them relatively efficient for storage and retrieval.

Did You Know?

The '.abz' extension stands for 'Astral A-Code Binary', a naming convention used by Esri for some of their cached data formats.
These cache files are generated by ArcGIS software to improve performance by avoiding redundant processing of map data.

Security Information

.abz files are typically safe as they contain pre-rendered map images and metadata. However, always ensure you are downloading them from trusted sources, as with any file, to avoid potential malware disguised as map data.