Convert TAB to BNA Online - Free & Fast

What is TAB?

MapInfo TAB is the native read/write format for MapInfo Professional, storing vector layers with geometry, attributes, styling rules, and projection information in a set of files that together form a complete map layer.

What is BNA?

Atlas Boundaries (BNA) is a simple ASCII coordinate format for storing polygon boundary data, originally developed by Atlas GIS for representing area features like postal codes, sales territories, and administrative regions as coordinate lists.

When Should You Use TAB vs BNA?

TAB vs BNA: Key Differences

• •The core technical difference: TAB relies on lossless compression whereas BNA uses lossy compression.
• •Converting from TAB to BNA changes compression type: lossy source becomes smaller but with some quality tradeoff.
• •Transparency: Yes - BNA is a plain text format — converting from TAB will merge transparency into a solid background
• •TAB files are typically 10KB to 2GB depending on layer complexity while BNA files range 1KB to 50MB depending on boundary complexity
• •Use case fit: TAB targets mapinfo gis projects, cadastral mapping, desktop spatial analysis and BNA targets atlas gis boundary exchange, regional mapping, legacy spatial data conversion — your choice depends on which workflow stage you are serving.

Advantages of TAB

• ✓TAB applies lossless compression specifically calibrated for MapInfo GIS projects, cadastral mapping, desktop spatial analysis.
• ✓TAB enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓TAB guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find TAB support built into virtually every tool that handles MapInfo GIS projects, cadastral mapping, desktop spatial analysis — no plugins or converters needed.

Advantages of BNA

• ✓BNA applies lossy compression specifically calibrated for Atlas GIS boundary exchange, regional mapping, legacy spatial data conversion.
• ✓BNA enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓BNA delivers impressive compression ratios, shrinking files dramatically while keeping visual quality high.
• ✓You will find BNA support built into virtually every tool that handles Atlas GIS boundary exchange, regional mapping, legacy spatial data conversion — no plugins or converters needed.

Common Use Cases for TAB to BNA Conversion

Industry Applications

Best Practices for TAB to BNA Conversion

• →When converting TAB to BNA: confirm the coordinate reference system (CRS / projection) is preserved or explicitly reprojected
• →Keep attribute tables and feature metadata intact — BNA should retain all fields from TAB
• →Check geometry types (point, line, polygon) map cleanly between the two formats
• →Verify that z/elevation values and topology survive the conversion when working with terrain data
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

Troubleshooting TAB to BNA Conversion

• !Topology errors in the converted BNA → self-intersecting polygons or duplicate vertices may not transfer cleanly between formats
• !The BNA file coordinate values shifted slightly → datums (WGS84 vs NAD83) differ even when the projection looks similar
• !Time field values were corrupted after converting TAB to BNA → date and time field formatting varies across GIS formats
• !Null geometry features appear in the converted BNA → empty or null-shape records in TAB may cause validation errors in some formats

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